技术领域technical field
本发明属于金属管制备技术领域，具体涉及一种超细长薄壁无缝金属管的一体成型方法。The invention belongs to the technical field of metal pipe preparation, and in particular relates to an integral forming method of an ultra-slender thin-walled seamless metal pipe.
背景技术Background technique
金属多孔管以特殊的孔结构和优异的耐腐蚀性、抗氧化性、耐磨性、力学性能(延性和冲击强度)等性能，在核工业、能源制造、石油化工、金属冶金、废气处理、污水治理等领域的过滤、分离、流体分布等功能领域中担当着重要的角色。现在工业生产中为了增加过滤面积、提高过滤分离效率，多数是将金属多孔管制作成一个组件或管束来取代原来单只金属多孔管进行过滤分离，在组件或管束总体积与单只金属多孔管体积相同的条件下，这就要求组件或管束内的金属多孔管具有较大长径比的尺寸要求，并且由于过滤分离条件的提升，还要求金属多孔管具有薄壁的特点。这就需要可靠的联接方式将超细长薄壁金属多孔管组合在一起。一般采用的是先完成超细长薄壁金属多孔管的制作，然后对金属致密管的接入方式进行设计，最后再进行焊接的模式。焊接的好坏直接决定了元件的服役领域和使用场合。通常而言，对焊缝致密性要求不高的场合，如在气/固分离、固/液分离等领域中的使用，由于所需分离的物质颗粒较大，因而对金属多孔管及其焊缝处性能要求较小。但对于一些苛刻条件如气/气分离场合中的应用，通常要求整体组件的氦气泄漏率低于10-9Pa·m3/s，这就对金属多孔管与金属致密管之间的焊缝处性能要求严格。例如使用金属多孔管作为支撑体的钯复合膜纯化氢气时，对金属多孔管和致密管的焊缝处的致密性要求极为严格，要求氦气泄漏率低至10-10Pa·m3/s量级。Metal porous tubes are widely used in nuclear industry, energy manufacturing, petrochemical industry, metallurgy, waste gas treatment, It plays an important role in functional areas such as filtration, separation, and fluid distribution in sewage treatment and other fields. In order to increase the filtration area and improve the efficiency of filtration and separation in industrial production, most metal porous tubes are made into a component or tube bundle to replace the original single metal porous tube for filtration and separation. Under the same conditions, this requires the metal porous tube in the component or tube bundle to have a larger aspect ratio size requirement, and due to the improvement of filtration separation conditions, the metal porous tube also requires the characteristics of thin walls. This requires a reliable connection method to combine ultra-slender thin-walled metal porous tubes. Generally, the production of ultra-slender and thin-walled metal porous tubes is firstly completed, and then the connection method of metal dense tubes is designed, and finally the mode of welding is carried out. The quality of welding directly determines the service field and use occasion of the component. Generally speaking, in the occasions where the tightness of the weld is not high, such as in the fields of gas/solid separation and solid/liquid separation, due to the large particles of the material to be separated, the metal porous pipe and its welded Seam performance requirements are small. However, for applications under harsh conditions such as gas/gas separation, it is generally required that the helium leakage rate of the overall component is lower than 10-9 Pa·m3 /s, which is very important for the welding between metal porous tubes and metal dense tubes. Seam performance requirements are strict. For example, when using a palladium composite membrane supported by a metal porous tube to purify hydrogen, the tightness of the weld between the metal porous tube and the dense tube is extremely strict, and the helium leakage rate is required to be as low as 10-10 Pa m3 /s order of magnitude.
一般金属之间常规的焊接方法有真空钎焊、电弧焊、气电焊、激光焊、电子束焊等，超细长薄壁金属多孔管制备完成后再与金属致密管进行焊接，由于金属多孔管特殊的孔结构以及细长的尺寸要求，会导致焊接过程难以操作完成，焊接后焊缝处出现比金属多孔管本身孔径还要大的孔洞，焊缝接头的致密性严重下降，这对金属多孔管束组件在多个场合下的可靠使用性产生了不利影响，特别是在一些要求苛刻的气/气分离使用场合中，根本达不到工况企业所提出的使用要求，由于金属多孔管本身具有的特殊结构，使得采用一般常规方法与金属致密管进行焊接后，焊接后的焊缝处经常会出现比金属多孔管本身还要大的孔径，氦气泄漏率只能达到10-3～10-5Pa·m3/s，根本没有办法满足应用要求。Conventional welding methods between general metals include vacuum brazing, arc welding, gas electric welding, laser welding, electron beam welding, etc. After the ultra-slender thin-walled metal porous tube is prepared, it is welded with the metal dense tube. The special pore structure and slender size requirements will make it difficult to complete the welding process. After welding, there will be holes in the weld seam that are larger than the pore diameter of the metal porous pipe itself, and the compactness of the weld joint will be seriously reduced. The reliable usability of the tube bundle assembly in many occasions has had an adverse effect, especially in some demanding gas/gas separation applications, which simply cannot meet the use requirements proposed by the working condition enterprise, because the metal porous tube itself has Due to the special structure of the metal pipe, after welding with the metal dense pipe by the general conventional method, the weld seam after welding often has a hole diameter larger than that of the metal porous pipe itself, and the helium leakage rate can only reach 10-3 ~ 10- 5 Pa·m3 /s, there is no way to meet the application requirements.
迄今为止，尽管已有较多金属焊接方面的相关报导，但大多是致密材料之间的焊接，所属研究领域完全不同，而有关金属多孔管与金属致密管之间整体无缝焊接工艺及理论研究，国内外暂无报导，也未见相关专利记述。So far, although there have been many related reports on metal welding, most of them are welding between dense materials, and their research fields are completely different. , there are no reports at home and abroad, and no relevant patent descriptions have been seen.
发明内容Contents of the invention
本发明所要解决的技术问题在于针对上述现有技术中的不足，提供一种超细长薄壁无缝金属管的一体成型方法，该方法设计合理、工艺简单、操作步骤简便且对设备要求不高，适用于制备各种金属材质的超细长薄壁无缝金属管，得到的无缝金属管由金属致密管和金属多孔管以及置于两者之间的金属过渡管无缝连接而成，结合牢固，密封性能好，机械强度高，能满足各种对氦气泄漏率要求极高的使用环境中，且使用寿命长。The technical problem to be solved by the present invention is to provide an integrated forming method of ultra-slender and thin-walled seamless metal pipes in view of the deficiencies in the above-mentioned prior art. High, suitable for the preparation of ultra-slender thin-walled seamless metal tubes of various metal materials, the obtained seamless metal tubes are seamlessly connected by metal dense tubes and metal porous tubes and metal transition tubes placed between the two , strong combination, good sealing performance, high mechanical strength, can meet various use environments with extremely high requirements on helium leakage rate, and has a long service life.
为解决上述技术问题，本发明采用的技术方案是：一种超细长薄壁无缝金属管的一体成型方法，其特征在于，包括以下步骤：In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for integrally forming an ultra-slender thin-walled seamless metal pipe, which is characterized in that it includes the following steps:
步骤一、将增塑剂与金属粉末A混合均匀，得到混合物A，将增塑剂与金属粉末B混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:(1～3)混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B的材质相同，所述金属粉末A的平均粒径为20μm～110μm，所述金属粉末B的平均粒径为30μm～150μm，所述金属粉末B的平均粒径与所述金属粉末A的平均粒径之差为10μm～50μm；Step 1. Mix the plasticizer and the metal powder A uniformly to obtain a mixture A, mix the plasticizer and the metal powder B uniformly to obtain a mixture B, and then mix a part of the mixture A and a part of the mixture B in a mass ratio of 1 : (1～3) mix uniformly to obtain mixture C; the material of the metal powder A and the metal powder B is the same, the average particle diameter of the metal powder A is 20 μm～110 μm, and the average particle diameter of the metal powder B is diameter is 30 μm to 150 μm, and the difference between the average particle diameter of the metal powder B and the average particle diameter of the metal powder A is 10 μm to 50 μm;
步骤二、将步骤一中剩余所述混合物A在预热条件下挤压成坯，得到第一坯料，将步骤一中剩余所述混合物B在预热条件下挤压成坯，得到第二坯料，将步骤一中所述混合物C在预热条件下挤压成坯，得到第三坯料；所述预热的温度为35℃～45℃；Step 2, extruding the remaining mixture A in step 1 into a billet under preheating conditions to obtain a first billet, and extruding the remaining mixture B in step 1 into a billet under preheating conditions to obtain a second billet , extruding the mixture C in step 1 into a billet under preheating conditions to obtain a third billet; the preheating temperature is 35° C. to 45° C.;
步骤三、将步骤二中所述第一坯料、第三坯料和第二坯料依次置于挤压筒内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为2T～10T，温度为35℃～45℃；Step 3: Place the first blank, the third blank and the second blank described in step 2 in sequence in the extrusion cylinder and compact them sequentially to obtain an extruded blank, and then use powder plasticized extrusion to extrude the extruded Continuously extruding the blank to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 2T-10T, and the temperature is 35°C-45°C;
步骤四、在保护气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为4mm～10mm，壁厚为0.2mm～1mm，超细长薄壁无缝金属管的长度与外径之比大于3，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.75～0.9倍，烧结处理的保温时间为120min～180min。Step 4, sintering the metal tube green body described in step 3 under a protective atmosphere to obtain an ultra-slender thin-walled seamless metal tube, and the outer diameter of the ultra-slim and thin-walled seamless metal tube is 4 mm to 10 mm , the wall thickness is 0.2 mm to 1 mm, the ratio of the length to the outer diameter of the ultra-slender thin-walled seamless metal pipe is greater than 3, and the temperature of the sintering treatment is 0.75 to 0.9 times the melting point of the metal powder A in step 1 , The holding time of sintering treatment is 120min～180min.
上述的一种超细长薄壁无缝金属管的一体成型方法，其特征在于，步骤一中所述增塑剂与金属粉末A的质量比为(3～7):50，所述增塑剂与金属粉末B的质量比为(3～7):50。The integral molding method of the above-mentioned ultra-slender and thin-walled seamless metal pipe is characterized in that the mass ratio of the plasticizer to the metal powder A in step 1 is (3～7):50, and the plasticizer The mass ratio of agent to metal powder B is (3-7):50.
上述的一种超细长薄壁无缝金属管的一体成型方法，其特征在于，步骤一中所述混合物C的质量为所述混合物A质量的30％～50％。The above integral molding method of ultra-slender thin-walled seamless metal pipe is characterized in that the mass of the mixture C in step 1 is 30% to 50% of the mass of the mixture A.
上述的一种超细长薄壁无缝金属管的一体成型方法，其特征在于，步骤一中所述增塑剂为石蜡、羧甲基纤维素、淀粉或树脂。The integral molding method of the above-mentioned ultra-slim and thin-walled seamless metal pipe is characterized in that the plasticizer in step 1 is paraffin, carboxymethyl cellulose, starch or resin.
上述的一种超细长薄壁无缝金属管的一体成型方法，其特征在于，步骤三中压实所述第一坯料、第三坯料和第二坯料的压力均为15T～30T。The above integral forming method of ultra-slender and thin-walled seamless metal pipe is characterized in that in step 3, the pressures for compacting the first blank, the third blank and the second blank are all 15T-30T.
上述的一种超细长薄壁无缝金属管的一体成型方法，其特征在于，步骤一中所述金属粉末A和金属粉末B均为不锈钢粉末、镍粉、钛粉、镍基合金粉末或Fe-Al金属间化合物粉末。The integral molding method of the above-mentioned ultra-slender thin-walled seamless metal pipe is characterized in that the metal powder A and the metal powder B in step 1 are stainless steel powder, nickel powder, titanium powder, nickel-based alloy powder or Fe-Al intermetallic compound powder.
本发明与现有技术相比具有以下优点：Compared with the prior art, the present invention has the following advantages:
1、本发明设计合理、工艺简单、操作步骤简便且对设备要求不高，适用于制备各种金属材质的超细长薄壁无缝金属管，得到的无缝金属管由金属致密管和金属多孔管以及置于两者之间的金属过渡管无缝连接而成，结合牢固，密封性能好，机械强度高，能满足各种对氦气泄漏率要求极高的使用环境中，且使用寿命长。1. The present invention has reasonable design, simple process, simple operation steps and low requirements on equipment, and is suitable for preparing ultra-slender thin-walled seamless metal tubes of various metal materials. The obtained seamless metal tubes are composed of metal dense tubes and metal The porous tube and the metal transition tube placed between the two are seamlessly connected, the combination is firm, the sealing performance is good, and the mechanical strength is high, which can meet various operating environments that require extremely high helium leakage rates, and the service life long.
2、本发明得到的无缝金属管为一体式结构，避免了传统焊接方法对仪器或操作条件的严苛要求，通过巧妙的设计填料方式，实现了金属多孔管和金属致密管的无缝连接，解决的传统焊接工艺后金属管焊缝处气密性难于保证的难题，本发明得到的无缝金属管中金属致密管和金属多孔管由金属过渡管实现牢固结合，金属管中多孔部位与致密部位过渡平稳，且具有良好的密封性能和机械加工强度，适用于使用要求更为苛刻的气/气分离场合。2. The seamless metal pipe obtained in the present invention has an integrated structure, which avoids the strict requirements of traditional welding methods on instruments or operating conditions, and realizes the seamless connection of metal porous pipes and metal dense pipes through ingeniously designed packing methods , to solve the problem that the airtightness of the metal pipe weld is difficult to guarantee after the traditional welding process, the metal dense pipe and the metal porous pipe in the seamless metal pipe obtained by the present invention are firmly combined by the metal transition pipe, and the porous part in the metal pipe and the metal porous pipe are firmly combined. The dense part transitions smoothly, and has good sealing performance and mechanical processing strength, and is suitable for gas/gas separation occasions with more stringent requirements.
3、本发明适用范围广，能够推广适用于各种金属材质的超细长薄壁无缝金属管的制备中，尤其适用于对焊缝处致密性要求极高(焊缝的氦气泄漏率要求低至10-9～10-10Pa·m3/s)的场合。3. The present invention has a wide range of applications, and can be popularized and applied in the preparation of ultra-slender thin-walled seamless metal pipes made of various metal materials, and is especially suitable for extremely high requirements on the compactness of welds (helium leakage rate of welds) Occasions requiring as low as 10-9 ～10-10 Pa·m3 /s).
4、本发明通过对平均粒径不同、材质相同的金属粉末A和金属粉末B进行合理搭配，控制特定的烧结处理温度，实现较细粒径粉末的致密化以及较粗粒径粉末颗粒间烧结颈的形成，并且通过设计金属过渡管，解决了较粗粒径粉末和较细粒径粉末烧结时收缩率不一致的问题，避免了烧结处理过程中断管的难题，如果烧结处理的温度过高则金属管整体致密化无多孔部分，温度过低则较细粒径粉末部分未致密化，无法得到具有良好连接作用的过渡管，所以必须严格控制烧结处理的温度，才能实现较细粒径粉末的致密化和较粗粒径粉末形成多孔材料，进一步解决金属致密管与金属多孔管的连接问题。4. The present invention controls the specific sintering temperature by rationally matching metal powder A and metal powder B with different average particle sizes and the same material, so as to realize the densification of powders with finer particle sizes and interparticle sintering of powders with coarser particle sizes The formation of the neck, and through the design of the metal transition tube, the problem of inconsistent shrinkage during sintering of the coarser particle size powder and the finer particle size powder is solved, and the problem of interrupting the tube during the sintering process is avoided. If the temperature of the sintering process is too high, the The overall densification of the metal tube has no porous parts. If the temperature is too low, the finer particle size powder part will not be densified, and a transition tube with good connection effect cannot be obtained. Therefore, the temperature of the sintering process must be strictly controlled to achieve finer particle size powder. The densified and coarser particle size powder forms a porous material, which further solves the problem of connecting metal dense tubes and metal porous tubes.
下面通过附图和实施例，对本发明的技术方案做进一步的详细描述。The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
附图说明Description of drawings
图1为本发明中挤压坯料的结构示意图。Fig. 1 is a schematic structural view of an extrusion billet in the present invention.
图2为本发明中超细长薄壁无缝金属管的结构示意图。Fig. 2 is a structural schematic diagram of an ultra-slender thin-walled seamless metal pipe in the present invention.
图3为本发明实施例1中超细长薄壁无缝金属管纵向截面的SEM照片。Fig. 3 is a SEM photograph of the longitudinal section of the ultra-slender thin-walled seamless metal pipe in Example 1 of the present invention.
图4为本发明实施例1中超细长薄壁无缝金属管中金属致密管部分的SEM照片。Fig. 4 is a SEM photo of the metal dense tube part in the ultra-slender thin-walled seamless metal tube in Example 1 of the present invention.
图5为本发明实施例1中超细长薄壁无缝金属管中金属过渡管部分的SEM照片。Fig. 5 is a SEM photo of the metal transition pipe part in the ultra-slender thin-walled seamless metal pipe in Example 1 of the present invention.
图6为本发明实施例1中超细长薄壁无缝金属管中金属多孔管部分的SEM照片。Fig. 6 is a SEM photo of the metal porous tube part in the ultra-slender thin-walled seamless metal tube in Example 1 of the present invention.
附图标记说明:Explanation of reference signs:
1—第一坯料； 2—第二坯料； 3—第三坯料；1—the first blank; 2—the second blank; 3—the third blank;
4—挤压筒； 5—金属致密管； 6—金属过渡管；4—extrusion cylinder; 5—metal dense tube; 6—metal transition tube;
7—金属多孔管。7—Metal porous tube.
具体实施方式detailed description
实施例1Example 1
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比5:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比5:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为316L不锈钢粉末，所述金属粉末A的平均粒径为22μm，所述金属粉末B的平均粒径为34μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 5:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 5:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B were uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; the metal powder A and the metal powder B were both 316L stainless steel powders, and the average particle diameter of the metal powder A was 22 μm. The average particle diameter of the metal powder B is 34 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为6T，温度为40℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为25T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded blank through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 6T, the temperature is 40°C, and the first blank 1 and the third blank are compacted 3 and the pressure of the second blank 2 are both 25T;
步骤四、在高纯氩气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.77倍(1150℃)，烧结处理的保温时间为160min。Step 4. Sintering the metal tube green body described in step 3 in an atmosphere of high-purity argon gas (mass purity not less than 99.99%) to obtain an ultra-slim and thin-walled seamless metal tube. The outer diameter of the wall seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.77 times (1150° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 160min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为20mm的金属致密管5、长度约为10mm金属过渡管6和长度约为500mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 20 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 500 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
从图3中可以看出，采用线切割的加工方式沿本实施例制备的超细长薄壁无缝金属管的纵向剖开，在放大倍数为100的电镜下扫描看不到金属多孔管与金属致密管连接的明显界限，说明超细长薄壁无缝金属管连接致密，气密性好；从图4中可以看出，本实施例制备的超细长薄壁无缝金属管的金属致密管部分无明显空隙存在，烧结体致密；从图5中可以看出，本实施例制备的超细长薄壁无缝金属管的金属过渡管部分的管体由不同粒径的金属粉末烧结而成，仍存在孔洞；从图6中可以看出，本实施例制备的超细长薄壁无缝金属管的金属多孔管部分中金属颗粒间烧结颈发育良好，孔隙发生了球化，使不规则的孔道变得圆滑，具有良好的贯通孔隙结构。As can be seen from Figure 3, the ultra-slender thin-walled seamless metal tube prepared in this embodiment is cut longitudinally by wire cutting, and the metal porous tube and the The obvious boundary of metal dense tube connection shows that the ultra-slender and thin-walled seamless metal tube is tightly connected and has good air tightness; as can be seen from Figure 4, the metal of the ultra-slender and thin-walled seamless metal tube prepared in this embodiment There are no obvious gaps in the dense tube part, and the sintered body is dense; as can be seen from Figure 5, the tube body of the metal transition tube part of the ultra-slender thin-walled seamless metal tube prepared in this embodiment is sintered by metal powders of different particle sizes As can be seen from Figure 6, the sintering necks between the metal particles in the metal porous tube part of the ultra-slender thin-walled seamless metal tube prepared in this embodiment are well developed, and the pores are spheroidized, making The irregular channels become smooth and have a good through-pore structure.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在340.83MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KNInstron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 340.83MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例2Example 2
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比7:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比7:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:1混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为镍粉，所述金属粉末A的平均粒径为110μm，所述金属粉末B的平均粒径为150μm，所述混合物C的质量为所述混合物A质量的35％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 7:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 7:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:1 to obtain a mixture C; the metal powder A and the metal powder B are both nickel powders, and the average particle diameter of the metal powder A is 110 μm, so The average particle diameter of the metal powder B is 150 μm, the mass of the mixture C is 35% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为45℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为45℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为45℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 45°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 45°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 45°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为10T，温度为35℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为30T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through a pipe extrusion nozzle to obtain a metal pipe green body; the pressure of the powder plasticized extrusion is 10T, the temperature is 35°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 30T;
步骤四、在高纯氩气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为8mm，壁厚为1mm，长度为840mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.75倍(1100℃)，烧结处理的保温时间为180min。Step 4. Sintering the metal tube green body described in step 3 in an atmosphere of high-purity argon gas (mass purity not less than 99.99%) to obtain an ultra-slim and thin-walled seamless metal tube. The outer diameter of the wall seamless metal pipe is 8mm, the wall thickness is 1mm, and the length is 840mm. The temperature of the sintering treatment is 0.75 times (1100° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 180min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为30mm的金属致密管5、长度约为10mm金属过渡管6和长度约为800mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 30 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 800 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在247.36MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KN Instron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 247.36MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例3Example 3
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比6:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比6:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:3混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为Fe-Al金属间化合物粉末，所述金属粉末A的平均粒径为80μm，所述金属粉末B的平均粒径为130μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为羧甲基纤维素；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 6:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 6:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:3 to obtain a mixture C; the metal powder A and the metal powder B are both Fe-Al intermetallic compound powders, and the average particle size of the metal powder A is diameter is 80 μm, the average particle diameter of the metal powder B is 130 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is carboxymethyl cellulose;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为35℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为35℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为35℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 35°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 35°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 35°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为2T，温度为45℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为15T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded blank through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 2T, the temperature is 45°C, and the first blank 1 and the third blank are compacted 3 and the pressure of the second blank 2 are both 15T;
步骤四、在高纯氩气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为4mm，壁厚为0.6mm，长度为645mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.85倍(1300℃)，烧结处理的保温时间为150min。Step 4. Sintering the metal tube green body described in step 3 in an atmosphere of high-purity argon gas (mass purity not less than 99.99%) to obtain an ultra-slim and thin-walled seamless metal tube. The outer diameter of the wall seamless metal pipe is 4mm, the wall thickness is 0.6mm, and the length is 645mm. The temperature of the sintering treatment is 0.85 times (1300° C.) of the melting point of the metal powder A described in step 1. The heat preservation of the sintering treatment The time is 150min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为30mm的金属致密管5、长度约为15mm金属过渡管6和长度约为600mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 30 mm, a metal transition tube 6 with a length of about 15 mm, and a metal porous tube 7 with a length of about 600 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在96.87MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KN Instron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 96.87MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例4Example 4
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比7:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比7:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为NiCrAl镍基合金粉末，所述金属粉末A的平均粒径为30μm，所述金属粉末B的平均粒径为40μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为淀粉；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 7:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 7:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; the metal powder A and the metal powder B are both NiCrAl nickel-based alloy powders, and the average particle diameter of the metal powder A is 30 μm, the average particle diameter of the metal powder B is 40 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is starch;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为8T，温度为40℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为25T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through the pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 8T, the temperature is 40°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 25T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.85倍(1200℃)，烧结处理的保温时间为180min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.85 times (1200° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 180min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为30mm的金属致密管5、长度约为15mm金属过渡管6和长度约为1000mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 30 mm, a metal transition tube 6 with a length of about 15 mm, and a metal porous tube 7 with a length of about 1000 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在298.63MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KN Instron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 298.63MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例5Example 5
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比4:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比4:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为Inconel625镍基合金粉末，所述金属粉末A的平均粒径为38μm，所述金属粉末B的平均粒径为52μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为树脂；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 4:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 4:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; the metal powder A and the metal powder B are both Inconel625 nickel-based alloy powders, and the average particle diameter of the metal powder A is 38 μm, the average particle diameter of the metal powder B is 52 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is resin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为9T，温度为35℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为25T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded blank through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 9T, the temperature is 35°C, and the first blank 1 and the third blank are compacted 3 and the pressure of the second blank 2 are both 25T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.8倍(1130℃)，烧结处理的保温时间为120min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.8 times (1130° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 120min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为20mm的金属致密管5、长度约为10mm金属过渡管6和长度约为500mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 20 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 500 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在352.64MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using 30KNInstron5967 universal material testing machine under the condition of 352.64MPa to measure the fracture of the metal porous tube, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例6Example 6
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比4:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比4:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为钛粉，所述金属粉末A的平均粒径为80μm，所述金属粉末B的平均粒径为106μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 4:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 4:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; both the metal powder A and the metal powder B are titanium powder, and the average particle diameter of the metal powder A is 80 μm, so The average particle diameter of the metal powder B is 106 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为38℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为38℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为38℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 into a billet at a temperature of 38°C to obtain the first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 38°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 38°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为10T，温度为40℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为25T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through a pipe extrusion nozzle to obtain a metal pipe green body; the pressure of the powder plasticized extrusion is 10T, the temperature is 40°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 25T;
步骤四、在高纯氩气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.78倍(1320℃)，烧结处理的保温时间为130min。Step 4. Sintering the metal tube green body described in step 3 in an atmosphere of high-purity argon gas (mass purity not less than 99.99%) to obtain an ultra-slim and thin-walled seamless metal tube. The outer diameter of the wall seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.78 times (1320° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 130min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为20mm的金属致密管5、长度约为10mm金属过渡管6和长度约为500mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 20 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 500 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在186.31MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KNInstron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 186.31MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例7Example 7
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比6:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比6:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:1混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为316L不锈钢粉末，所述金属粉末A的平均粒径为75μm，所述金属粉末B的平均粒径为100μm，所述混合物C的质量为所述混合物A质量的50％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 6:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 6:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:1 to obtain a mixture C; the metal powder A and the metal powder B are both 316L stainless steel powders, and the average particle diameter of the metal powder A is 75 μm. The average particle diameter of the metal powder B is 100 μm, the mass of the mixture C is 50% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为42℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为42℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为42℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 42°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 42°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 42°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为8T，温度为40℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为22T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through the pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 8T, the temperature is 40°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 22T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.88倍(1330℃)，烧结处理的保温时间为130min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.88 times (1330° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 130min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为20mm的金属致密管5、长度约为10mm金属过渡管6和长度约为500mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 20 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 500 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在249.86MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KNInstron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 249.86MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例8Example 8
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比6:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比6:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为304不锈钢粉末，所述金属粉末A的平均粒径为100μm，所述金属粉末B的平均粒径为150μm，所述混合物C的质量为所述混合物A质量的48％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 6:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 6:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; the metal powder A and the metal powder B are both 304 stainless steel powders, and the average particle diameter of the metal powder A is 100 μm. The average particle diameter of the metal powder B is 150 μm, the mass of the mixture C is 48% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为7T，温度为35℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为20T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 7T, the temperature is 35°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 20T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为6mm，壁厚为1mm，长度为530mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.9倍(1380℃)，烧结处理的保温时间为145min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 6 mm, the wall thickness is 1 mm, and the length is 530 mm. The temperature of the sintering treatment is 0.9 times (1380° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 145min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为20mm的金属致密管5、长度约为10mm金属过渡管6和长度约为500mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 20 mm, a metal transition tube 6 with a length of about 10 mm, and a metal porous tube 7 with a length of about 500 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在347.52MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KN Instron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 347.52MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例9Example 9
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比7:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比7:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:2混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为316L不锈钢粉末，所述金属粉末A的平均粒径为70μm，所述金属粉末B的平均粒径为100μm，所述混合物C的质量为所述混合物A质量的40％，所述增塑剂为石蜡；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 7:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 7:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B are uniformly mixed at a mass ratio of 1:2 to obtain a mixture C; the metal powder A and the metal powder B are both 316L stainless steel powders, and the average particle diameter of the metal powder A is 70 μm. The average particle diameter of the metal powder B is 100 μm, the mass of the mixture C is 40% of the mass of the mixture A, and the plasticizer is paraffin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为8T，温度为45℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为20T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded blank through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 8T, the temperature is 45°C, and the first blank 1 and the third blank are compacted 3 and the pressure of the second blank 2 are both 20T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为10mm，壁厚为0.2mm，长度为32mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.88倍(1330℃)，烧结处理的保温时间为120min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 10mm, the wall thickness is 0.2mm, and the length is 32mm. The temperature of the sintering treatment is 0.88 times (1330° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 120min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为5mm的金属致密管5、长度约为2mm金属过渡管6和长度约为25mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 5 mm, a metal transition tube 6 with a length of about 2 mm, and a metal porous tube 7 with a length of about 25 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在98.73MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using 30KNInstron5967 universal material testing machine under the condition of 98.73MPa to measure the fracture of the metal porous tube, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
实施例10Example 10
本实施例包括以下步骤：This embodiment includes the following steps:
步骤一、将增塑剂与金属粉末A按质量比5:50混合均匀，得到混合物A，将增塑剂与金属粉末B按质量比5:50混合均匀，得到混合物B，然后将部分所述混合物A和部分所述混合物B按质量比1:1混合均匀，得到混合物C；所述金属粉末A与所述金属粉末B均为316L不锈钢粉末，所述金属粉末A的平均粒径为105μm，所述金属粉末B的平均粒径为133μm，所述混合物C的质量为所述混合物A质量的30％，所述增塑剂为树脂；Step 1. Mix the plasticizer and metal powder A uniformly in a mass ratio of 5:50 to obtain a mixture A, and uniformly mix the plasticizer and metal powder B in a mass ratio of 5:50 to obtain a mixture B, and then partly describe The mixture A and part of the mixture B were uniformly mixed at a mass ratio of 1:1 to obtain a mixture C; the metal powder A and the metal powder B were both 316L stainless steel powders, and the average particle diameter of the metal powder A was 105 μm. The average particle diameter of the metal powder B is 133 μm, the mass of the mixture C is 30% of the mass of the mixture A, and the plasticizer is resin;
步骤二、如图1所示，将步骤一中剩余所述混合物A在温度为40℃条件下挤压成坯，得到第一坯料1，将步骤一中剩余所述混合物B在温度为40℃条件下挤压成坯，得到第二坯料2，将步骤一中所述混合物C在温度为40℃条件下挤压成坯，得到第三坯料3；Step 2, as shown in Figure 1, extrude the remaining mixture A in step 1 at a temperature of 40°C to obtain a first billet 1, and extrude the remaining mixture B in step 1 at a temperature of 40°C Extruding into a billet under conditions to obtain a second billet 2, extruding the mixture C described in step 1 at a temperature of 40°C to obtain a third billet 3;
步骤三、将步骤二中所述第一坯料1、第三坯料3和第二坯料2依次置于挤压筒4内并依次压实，得到挤压坯料，然后采用粉末增塑挤压的方式将所述挤压坯料经管材挤压嘴连续挤出，得到金属管生坯；所述粉末增塑挤压的压力为7T，温度为35℃，压实所述第一坯料1、第三坯料3和第二坯料2的压力均为18T；Step 3. Place the first blank 1, the third blank 3 and the second blank 2 in the step 2 in sequence in the extrusion cylinder 4 and compact them sequentially to obtain the extrusion blank, and then adopt the method of powder plasticizing extrusion Continuously extrude the extruded billet through a pipe extrusion nozzle to obtain a green metal pipe; the pressure of the powder plasticized extrusion is 7T, the temperature is 35°C, and the first billet 1 and the third billet are compacted 3 and the pressure of the second blank 2 are both 18T;
步骤四、在高纯氢气(质量纯度不低于99.99％)气氛下对步骤三中所述金属管生坯进行烧结处理，得到超细长薄壁无缝金属管，所述超细长薄壁无缝金属管的外径为5mm，壁厚为0.5mm，长度为150mm，所述烧结处理的温度为步骤一中所述金属粉末A的熔点的0.9倍(1350℃)，烧结处理的保温时间为140min。Step 4. Sintering the green body of the metal tube described in Step 3 in an atmosphere of high-purity hydrogen (mass purity not less than 99.99%) to obtain an ultra-slender and thin-walled seamless metal tube. The ultra-slender and thin-walled seamless metal tube is The outer diameter of the seamless metal pipe is 5 mm, the wall thickness is 0.5 mm, and the length is 150 mm. The temperature of the sintering treatment is 0.9 times (1350° C.) of the melting point of the metal powder A described in step 1. The holding time of the sintering treatment is 140min.
如图2所示，本实施例制备的超细长薄壁无缝金属管由长度约为15mm的金属致密管5、长度约为5mm金属过渡管6和长度约为130mm的金属多孔管7组成，其中金属致密管5由第一坯料1经粉末增塑挤压和烧结处理后得到，金属过渡管6经第三坯料3经粉末增塑挤压和烧结处理后得到，金属多孔管7由第二坯料2经粉末增塑挤压和烧结处理后得到。As shown in Figure 2, the ultra-slender thin-walled seamless metal tube prepared in this embodiment consists of a metal dense tube 5 with a length of about 15 mm, a metal transition tube 6 with a length of about 5 mm, and a metal porous tube 7 with a length of about 130 mm. , wherein the metal dense tube 5 is obtained from the first blank 1 through powder plasticizing extrusion and sintering treatment, the metal transition tube 6 is obtained from the third blank 3 through powder plasticizing extrusion and sintering treatment, and the metal porous tube 7 is obtained from the second blank 3 The second blank 2 is obtained after powder plasticizing extrusion and sintering.
对本实施例得到的超细长薄壁无缝金属管进行封孔处理，然后采用氦质谱检漏仪检测金属过渡管部位的气密性，结果为泄漏率可达到10-10Pa·m3/s量级水平，采用30KNInstron5967万能材料试验机在137.36MPa条件下测得金属多孔管部位断裂，而其他部位均未断裂，说明该超细长薄壁无缝金属管具有良好的密封性能和机械加工强度。Seal the ultra-slender thin-walled seamless metal pipe obtained in this example, and then use a helium mass spectrometer leak detector to detect the airtightness of the metal transition pipe. The result is that the leak rate can reach 10-10 Pa·m3 / s level, using a 30KNInstron5967 universal material testing machine to measure the fracture of the metal porous tube under the condition of 137.36MPa, while the other parts are not broken, indicating that the ultra-slender thin-walled seamless metal tube has good sealing performance and mechanical processing strength.
以上所述，仅是本发明的较佳实施例，并非对本发明作任何限制，凡是根据本发明技术实质对以上实施例所作的任何简单修改、变更以及等效结构变化，均仍属于本发明技术方案的保护范围内。The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.
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| CN201510543561.0ACN105033260B (en) | 2015-08-28 | 2015-08-28 | A kind of integral formation method of ultra-fine long thin-walled seamless metal pipe |
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