CN111266571B - Adhesive, TiAl alloy turbine injection molding preparation method and product - Google Patents
Adhesive, TiAl alloy turbine injection molding preparation method and productDownload PDFInfo
- Publication number
- CN111266571B CN111266571BCN202010119468.8ACN202010119468ACN111266571BCN 111266571 BCN111266571 BCN 111266571BCN 202010119468 ACN202010119468 ACN 202010119468ACN 111266571 BCN111266571 BCN 111266571B
- Authority
- CN
- China
- Prior art keywords
- temperature
- degreasing
- speed
- turbine
- injection molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Powder Metallurgy (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to an injection molding preparation method of a binder and a TiAl alloy turbine and a product.
Background
The turbocharging technology is one of the most effective means for realizing energy conservation and emission reduction in the automobile industry. The technology utilizes the inertia impulse force of the exhaust gas discharged by an engine to push a turbine in a turbine chamber, the turbine drives a coaxial impeller, and the impeller pumps the air sent by an air filter pipeline to pressurize the air to enter an air cylinder. When the rotating speed of the engine is increased, the exhaust gas discharge speed and the rotating speed of the turbine are also increased synchronously, the impeller compresses more air to enter the air cylinder, the pressure and the density of the air are increased, more fuel can be combusted, the fuel quantity is correspondingly increased, the rotating speed of the engine is adjusted, and therefore the output power of the engine is increased. The turbocharger turbine is a core part, and the performance of the turbocharger turbine directly determines the energy-saving and emission-reducing effects of the engine. The precision casting method is a main forming method of the turbocharger turbine for a long time, but the improvement of the service life of the turbine is severely limited because defects such as inclusion, looseness, coarse grains, component segregation and the like are easily generated in the casting process. In recent years, a plurality of developed countries use metal powder injection molding to prepare supercharger turbines, the technology can overcome the casting defects in the precision casting process, realize the mass and near-net-shape preparation of parts with complex shapes, and the prepared samples have high dimensional precision, uniform structure and excellent performance.
Turbine materials are also continually being upgraded with the rapid development of supercharger technology. The initial diesel supercharger turbine generally adopts 20Cr3MoWV (A), and the material is gradually replaced by Inconel713 class nickel-based high-temperature alloy along with the development of lightweight, small-sized and high-speed superchargers. However, the material has great limitations, such as poor responsiveness caused by large mass of the turbine, slow response of the inertia action of the impeller to the change of the accelerator in sudden time, delayed response of the turbine and the like. Therefore, weight reduction of the turbo material is one of the important ways to improve the performance of the engine. The TiAl-based alloy has the characteristics of light weight, high strength, heat resistance and the like, the service temperature can reach more than 700 ℃, the weight of the TiAl-based alloy can be reduced by 40-50% when the TiAl-based alloy is used for preparing a turbo-charger, the acceleration responsiveness of a turbo-charger engine is obviously improved, the emission pollution of the engine during starting and speed changing is reduced, and the TiAl-based alloy has great potential for replacing the traditional nickel-based superalloy in a new generation of high-temperature structural material used by the engine.
However, the TiAl alloy powder injection molding preparation method for the engine supercharger has some problems. The paraffin-based binder is a binder system which has the longest research time and the most mature process at present, when the paraffin-based binder is used for preparing a TiAl alloy supercharger turbine for injection molding, because the size of the supercharger turbine is larger, particularly the thicknesses of the central part and the blade part of the turbine are quite uneven, in the second-stage thermal degreasing process of degreasing, after binder components bearing framework agents are completely removed, because the difference between the temperature at the end of the thermal degreasing stage and the temperature at which a sintering neck is formed by pre-sintering a degreasing blank is too large, weak Van der Waals acting force among particles can cause the degreasing blank to be incapable of keeping the shape to the sintering neck forming stage, and the degreasing blank of the turbine collapses in the thermal degreasing process, so the problem exists in the TiAl alloy powder injection molding preparation process for the engine supercharger at present.
Disclosure of Invention
The invention mainly aims to provide a binder, an injection molding preparation method of a TiAl alloy turbine and a product, wherein the binder for the injection molding of TiAl-based alloy powder is improved by adding a low-melting-point and high-decomposition-temperature skeleton agent component silicone resin into a traditional wax-based binder system, so that a turbine blank is endowed with strong shape-preserving capability, and meanwhile, the silicone resin can react with a TiAl matrix in situ in the high-temperature decomposition process to generate finely and dispersedly distributed Ti2AlC and Ti5Si3The reinforcing phase effectively improves the mechanical property of the TiAl alloy turbine so as to solve the technical problem that a turbine degreasing blank collapses in the thermal degreasing process due to the adoption of the traditional binder in the prior art.
In order to achieve the above object, according to a first aspect of the present invention, there is provided an adhesive.
The adhesive comprises the following components in percentage by volume: 50-70% of paraffin, 3-15% of high-density polyethylene, 5-10% of polypropylene, 5-10% of stearic acid and 5-17% of silicone resin.
In order to achieve the above object, according to a second aspect of the present invention, there is provided an injection molding production method of a TiAl alloy turbine.
The injection molding preparation method of the TiAl alloy turbine comprises the following steps:
s1, preparation of feed: mixing TiAl-based prealloying powder and the binder of claim 1 according to a certain proportion, and crushing to form granular feed;
s2, injection molding: injecting and forming the feed material on an injection machine to obtain a turbine blank;
s3, degreasing and pre-sintering: degreasing and presintering the turbine blank;
s4, sintering: and sintering the turbine blank degreased and presintered in the step S3, and cooling along with the furnace to obtain the turbine product.
Further, in the step S1, the content of the binder is 60 to 65 vol.%; the TiAl-based prealloyed powder comprises the following components in atomic percentage: the Al content is 43-49 at.%, the Cr content is 0-5 at.%, the Nb content is 1-8 at.%, and the balance is Ti.
Further, in the step S1, the mixing temperature is 150-190 ℃, the rotation speed is 10-30 r/min, and the time is 1-2 h; and cutting the mixture into granules by a crusher after the mixing is finished.
Further, in the step S2, the feed is heated to 120-175 ℃, the injection pressure is 40-80 MPa, the pressure maintaining pressure is 40-100 MPa, the pressure maintaining time is 5-25S, the mold temperature is 50-100 ℃, and the injection speed is 50-80% of the maximum injection speed of the injection machine.
Further, in the step S3, the degreasing treatment includes a solvent degreasing process and a thermal degreasing process, and the thermal degreasing process is performed under the protection of an inert gas; the pre-sintering treatment process is carried out at the temperature of 800-1200 ℃ at the speed of 2-10 ℃/min, and the temperature is kept for 0.5-1.5 h.
Further, in the solvent degreasing process, a degreasing solvent is n-heptane or trichloroethylene, the degreasing temperature is 40-55 ℃, and the degreasing time is 18-48 h; and after degreasing, drying at the temperature of 45-55 ℃, wherein the drying time is 4-12 h.
Further, the thermal degreasing process is to heat the temperature from room temperature to 150-200 ℃ at a speed of 0.5-2 ℃/min, and then the temperature is kept for 0.5-1.5 h to carry out first-stage thermal degreasing; raising the temperature to 300-400 ℃ at a speed of 0.5-1.5 ℃/min, and keeping the temperature for 0.5-1.5 h to carry out second-stage thermal degreasing; heating to 450-600 ℃ at a speed of 0.5-2 ℃/min, and preserving heat for 0.5-1.5 h to carry out third-stage thermal degreasing; heating to 600-800 ℃ at a speed of 0.5-2 ℃/min, and keeping the temperature for 0.5-1.5 h to perform thermal degreasing at the fourth stage.
Further, in the step S4, the sintering process is performed under the protection of inert gas or under vacuum condition, wherein the vacuum degree is 10-2～10-4Pa; heating the mixture from room temperature to 1000-1200 ℃ at a speed of 2-10 ℃/min, and preserving heat for 0.5-2 h to carry out first-stage sintering; and then heating to 1400-1550 ℃ at the rate of 1-3 ℃/min, and keeping the temperature for 1-4 h, and carrying out second-stage sintering.
To achieve the above object, according to a third aspect of the present invention, there is provided an article.
The product prepared by the injection molding preparation method of the TiAl alloy turbine is characterized by being a TiAl alloy turbine with Ti2AlC and Ti5Si3Enhanced alpha2A/gamma full lamellar structure; wherein, the Ti2AlC and Ti5Si3The particle size of the inorganic particles is 1-3 mu m; a is said2Alpha in a/gamma full lamellar structure2The phase and the gamma phase are both of lath structures; a is said2The phase accounts for 10-20% by mass, and the gamma phase accounts for 80-90% by mass.
In a traditional paraffin-based binder system, the decomposition temperature of high-density polyethylene of a high-molecular skeleton agent component is 450-550 ℃, and the forming temperature of a sintering neck of TiAl alloy powder is 800-1200 ℃. In the thermal degreasing process, if the high-density polyethylene playing a role of the skeleton agent is completely removed, the weak van der waals force between particles is difficult to maintain the green shape to the pre-sintered state due to the overlarge difference between the third-stage degreasing temperature and the pre-sintering temperature, so that the TiAl turbine collapses. The silicone resin with inorganic main chain and organic side chain has high temperature decomposition temperature superior to that of other organic polymer material. Therefore, the introduction of the silicone resin skeleton agent with low melting and high decomposition temperature can not only meet the requirement of uniform mixing of all binder components in the mixing process, but also fill the blank from the end of degreasing in the third stage to the formation stage of a sintering neck in the thermal degreasing process, continuously play the role of the skeleton agent to maintain the shape of a green body, effectively improve the stability of the TiAl alloy turbine green body in the thermal degreasing process,the injection molding process preparation of the TiAl turbine with the high complex shape is ensured. In addition, the melting temperature of the silicone resin is 150-200 ℃, the decomposition temperature is 500-750 ℃, the silicone resin can generate C and Si in the high-temperature decomposition process, and the C and Si and the TiAl matrix generate dispersedly distributed Ti in situ2AlC and Ti5Si3The ceramic particle reinforced phase can obviously improve the mechanical property of the material. The amount of the silicone resin added is 5 to 17%, and when the amount is too low, it is difficult to effectively act as a skeleton agent to maintain the shape of a green body, and when the amount is too high, Ti is formed2AlC and Ti5Si3The reinforcing phase is too much, so that the agglomeration phenomenon occurs, and the performance of the material is deteriorated. Experiments prove that the turbocharger turbine component with high dimensional precision, uniform interior and excellent mechanical property can be obtained by the process.
The invention designs and prepares Ti2AlC and Ti5Si3Enhanced alpha2The TiAl alloy turbine with the/gamma full-lamellar structure is characterized in that the TiAl alloy turbine with light weight and high strength belongs to a high-temperature structure precision piece and has higher requirements on the performance of materials. For TiAl alloys, Ti2AlC particles are one of the more effective reinforcing phase particles known. And Ti5Si3The phase is also a reinforcing phase which is reported at present and has obvious improvement effect on the high-temperature performance of the TiAl alloy. Thus Ti2AlC and Ti5Si3The generation of the reinforcing phase can effectively improve the mechanical property of the TiAl alloy turbine. In addition, in the four typical structures of the TiAl alloy, the alpha is uniformly fine2The/gamma full lamellar structure not only has good room temperature performance, but also has excellent high temperature performance. The invention controls alpha in lamellar structure by regulating and controlling Al content in raw material powder2And gamma phases, and alpha is determined2The phase accounts for 10-20%, if alpha2If the proportion of the phase is too low, the fracture toughness and creep resistance are seriously reduced, and if alpha is2If the proportion of the phases is too high, the mechanical properties at room temperature are poor, such as tensile strength and plasticity are greatly reduced, and better comprehensive mechanical properties are difficult to obtain. Experiments prove that the process can obtain the reinforcing phase with uniform distribution, fine grains and full lamellar structureAnd a turbocharger turbine component having excellent overall performance.
The invention has the beneficial effects that:
(1) the method has the advantages that the powder injection molding technology is adopted, the near-net-shape preparation of the TiAl alloy supercharger turbine for the engine with the complex shape is realized, compared with the existing machining technology, the method is simple in process, low in equipment requirement, high in material utilization rate, greatly reduced in cost and easy to realize the batch preparation of the supercharger turbine.
(2) A novel paraffin-based binder system suitable for TiAl alloy turbine preparation is designed, and the shape retention of blanks and the size precision of final products are improved.
(3) Designs specific Ti2AlC and Ti5Si3Enhanced alpha2The TiAl alloy supercharger turbine with a/gamma full lamellar structure has excellent room-temperature and high-temperature mechanical properties.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a scanning electron microscope morphology of TiAl-based alloy raw material powder in example 1 of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention discloses an improved wax-based binder for TiAl alloy powder injection molding, which comprises the following components in percentage by volume: 50-70% of paraffin, 3-15% of high-density polyethylene, 5-10% of polypropylene, 5-10% of stearic acid and 5-17% of silicone resin.
In the embodiment, the binder mainly comprises 50-70% of paraffin wax, 3-15% of high-density polyethylene, 5-10% of polypropylene, 5-10% of stearic acid and 5-17% of silicone resin in percentage by volume, wherein the low-melting-point and high-decomposition-temperature skeleton agent component silicone resin is added into a traditional wax-based binder system for improvement, so that the turbine blank is endowed with strong shape-preserving capability, and the problem that the turbine blank is easy to collapse in a thermal degreasing process is solved. Meanwhile, the silicone resin can react with the TiAl matrix in situ in the high-temperature decomposition process to generate fine and dispersedly distributed Ti2AlC and Ti5Si3Reinforcing phase, and further effectively improving the mechanical property of the TiAl alloy turbine. The addition amount of the silicone resin is within the range of 5-17%, and if the addition amount is too low, the silicone resin is difficult to effectively act as a skeleton agent to maintain the shape of a green body; if the amount of addition is too high, Ti is formed2AlC and Ti5Si3The reinforcing phase is too much, so that the agglomeration phenomenon occurs, and the performance of the material is deteriorated.
The invention discloses an injection molding preparation method of a TiAl alloy turbine, which specifically comprises the following steps:
s1, preparation of feed: mixing TiAl-based prealloying powder and the binder, and crushing to form granular feed.
In the step, TiAl-based pre-alloy powder and the binder are selected as raw materials, and the proportion of the TiAl-based pre-alloy powder to the binder is determined, wherein the content of the binder is 60-65 vol%; the TiAl-based prealloyed powder comprises the following components in atomic percentage: the Al content is 43-49 at.%, the Cr content is 0-5 at.%, the Nb content is 1-8 at.%, and the balance is Ti; the scanning electron microscope topography is shown in FIG. 1. Uniformly mixing the TiAl-based prealloying powder and the binder in an internal mixer, and crushing the mixture into granular feed by a crusher; wherein the mixing temperature is 150-190 ℃, the rotation speed is 10-30 r/min, and the mixing time is 1-2 h.
S2, injection molding: and (4) performing injection molding on the feed material on an injection molding machine to obtain a turbine blank.
In the step, the feed is heated to 120-175 ℃, the injection pressure is 40-80 MPa, the pressure maintaining pressure is 40-100 MPa, the pressure maintaining time is 5-25 s, the mold temperature is 50-100 ℃, and the injection speed is 50-80% of the maximum injection speed of the injection machine.
S3, degreasing and pre-sintering: and degreasing and presintering the turbine blank.
In the step, the degreasing treatment comprises a solvent degreasing process and a thermal degreasing process, wherein a degreasing solvent in the solvent degreasing process is n-heptane or trichloroethylene, the degreasing temperature is 40-55 ℃, and the degreasing time is 18-48 h; and after degreasing, drying at the temperature of 45-55 ℃, wherein the drying time is 4-12 h. Then carrying out a thermal degreasing process under the protection of inert gas, wherein the inert gas is high-purity argon; in the thermal degreasing process, the temperature is increased from room temperature to 150-200 ℃ at the speed of 0.5-2 ℃/min, and the temperature is kept for 0.5-1.5 h for the first-stage thermal degreasing; raising the temperature to 300-400 ℃ at a speed of 0.5-1.5 ℃/min, and keeping the temperature for 0.5-1.5 h to carry out second-stage thermal degreasing; heating to 450-600 ℃ at a speed of 0.5-2 ℃/min, and preserving heat for 0.5-1.5 h to carry out third-stage thermal degreasing; heating to 600-800 ℃ at a speed of 0.5-2 ℃/min, and keeping the temperature for 0.5-1.5 h to perform thermal degreasing at a fourth stage; and finally, raising the temperature to 800-1200 ℃ at a speed of 2-10 ℃/min, and preserving the temperature for 0.5-1.5 h for pre-sintering.
S4, sintering: and sintering the turbine blank degreased and presintered in the step S3, and cooling along with the furnace to obtain the turbine product.
In this step, the sintering treatment is carried out under the protection of inert gas or under vacuum condition, wherein the vacuum degree is 10-2～10-4Pa; the sintering process comprises the following steps: heating the mixture from room temperature to 1000-1200 ℃ at a speed of 2-10 ℃/min, and preserving heat for 0.5-2 h to carry out first-stage sintering; and then heating to 1400-1550 ℃ at the rate of 1-3 ℃/min, and keeping the temperature for 1-4 h, and carrying out second-stage sintering.
The injection molding method for producing a TiAl alloy turbine will be described in detail below with reference to specific examples.
Example 1:
s1, preparation of feed: firstly, selecting TiAl-based prealloying powder and a binder, wherein: the composition of the TiAl-based prealloyed powder comprises 48 at.% of Al, 2 at.% of Cr, 2 at.% of Nb and the balance of Ti; then selecting 65% of solid powder loading, and respectively weighing 65% of paraffin, 6% of high-density polyethylene, 9% of polypropylene, 15% of silicone resin and 5% of stearic acid in volume ratio to form a binder system;
then mixing the TiAl-based prealloying powder with a binder at 160 ℃, at a rotation speed of 20r/min for 2 h. And taking out the feed after the mixing is finished and the temperature is cooled to room temperature, and obtaining granular feed by a crusher.
S2, injection molding:
and heating the feed material in an injection machine to 165 ℃ and then injecting the feed material, wherein the injection pressure is 60MPa, the pressure maintaining pressure is 70MPa, the pressure maintaining time is 10s, the mold temperature is 60 ℃, and the injection speed is 50% of the maximum injection speed of the injection machine, so that the TiAl alloy turbine blank for the engine supercharger is prepared.
S3, degreasing and pre-sintering:
putting the blank into a trichloroethylene solution for solvent degreasing, wherein the degreasing temperature is 45 ℃ and the time is 48h, and after the solvent degreasing is finished, drying the blank in a blast drying oven at 45 ℃ for 8 h; then carrying out thermal degreasing under the protection of high-purity argon, wherein the thermal degreasing condition is that the temperature is raised to 180 ℃ from room temperature at the rate of 1 ℃/min, and the temperature is kept for 1h for carrying out first-stage thermal degreasing; then raising the temperature at 0.5 ℃/min to 350 ℃, and preserving the temperature for 1h to carry out second-stage thermal degreasing; then heating to 500 ℃ at the speed of 1 ℃/min, and preserving heat for 1h to carry out third-stage thermal degreasing; then heating up to 750 ℃ at the speed of 1 ℃/min, and preserving heat for 0.5h to carry out thermal degreasing at the fourth stage; finally, the temperature is raised to 1100 ℃ at the speed of 5 ℃/min, and the temperature is preserved for 1h for presintering.
S4, sintering:
putting the degreased blank into a vacuum furnace for sintering, wherein the vacuum degree is 10-3Pa. The sintering process comprises the following steps: firstly, heating to 1100 ℃ at the speed of 5 ℃/min, and preserving heat for 1 h; and then raising the temperature to 1480 ℃ at the speed of 2 ℃/min, preserving the temperature for 2 hours, and then cooling to the room temperature along with the furnace to obtain the turbine workpiece.
Example 2:
s1, preparation of feed: firstly, selecting TiAl-based prealloying powder and a binder, wherein: the composition of the TiAl-based prealloyed powder is 46 at.% Al, 1 at.% Cr, 3 at.% Nb and the balance Ti; then selecting 67% of solid powder loading, and respectively weighing 65% of paraffin, 9% of high-density polyethylene, 9.5% of polypropylene, 9% of silicone resin and 7.5% of stearic acid in volume ratio to form a binder system;
then mixing the TiAl-based prealloying powder with a binder at 165 ℃ at a rotating speed of 25r/min for 2 h. And taking out the feed after the mixing is finished and the temperature is cooled to room temperature, and obtaining granular feed by a crusher.
S2, injection molding: and heating the feed material in an injection machine to 167 ℃, and then injecting the feed material, wherein the injection pressure is 60MPa, the pressure maintaining pressure is 70MPa, the pressure maintaining time is 15s, the mold temperature is 70 ℃, and the injection speed is 60% of the maximum injection speed of the injection machine, so that the TiAl alloy turbine blank for the engine supercharger is prepared.
S3, degreasing and pre-sintering: putting the blank into a trichloroethylene solution for solvent degreasing, wherein the degreasing temperature is 48 ℃, and the time is 40 h; after solvent degreasing is finished, drying in a forced air drying oven at 50 ℃, wherein the drying time is 6 h; then carrying out thermal degreasing under the protection of high-purity argon, wherein the thermal degreasing condition is that the temperature is raised to 160 ℃ from room temperature at the rate of 1 ℃/min, and the temperature is kept for 1 h; then raising the temperature to 380 ℃ at the speed of 0.5 ℃/min, and preserving the temperature for 1 h; then heating to 500 ℃ at the speed of 1 ℃/min, and preserving heat for 1 h; then raising the temperature to 780 ℃ at the speed of 1 ℃/min, and preserving the heat for 0.5 h; finally, the temperature is raised to 1100 ℃ at the speed of 6 ℃/min, and the temperature is preserved for 1h for presintering.
S4, sintering: putting the degreased blank into a vacuum furnace for sintering, wherein the vacuum degree is 10-3Pa. The sintering process comprises the following steps: firstly, heating to 1200 ℃ at the speed of 6 ℃/min, and preserving heat for 1 h; and then heating to 1490 ℃ at the speed of 2 ℃/min, preserving the heat for 2 hours, and then cooling to room temperature along with the furnace to obtain the turbine part.
Example 3:
s1, preparation of feed: firstly, selecting TiAl-based prealloying powder and a binder, wherein: the composition of the TiAl-based prealloyed powder is 46 at.% Al, 1 at.% Cr, 3 at.% Nb and the balance Ti; then selecting 67% of solid powder loading, and respectively weighing 65% of paraffin, 13% of high-density polyethylene, 9.5% of polypropylene, 5% of silicone resin and 7.5% of stearic acid in volume ratio to form a binder system;
mixing TiAl-based prealloying powder with a binder at the temperature of 170 ℃, the rotation speed of 30r/min and the time of 2 h. And taking out the feed after the mixing is finished and the temperature is cooled to room temperature, and obtaining granular feed by a crusher.
S2, injection molding: and heating the feed material in an injection machine to 170 ℃, and then injecting, wherein the injection pressure is 70MPa, the pressure maintaining pressure is 90MPa, the pressure maintaining time is 20s, the mold temperature is 80 ℃, and the injection speed is 55% of the maximum injection speed of the injection machine, so that the TiAl alloy turbine blank for the engine supercharger is prepared.
S3, degreasing and pre-sintering: putting the blank into an n-heptane solution for solvent degreasing, wherein the degreasing temperature is 50 ℃, and the time is 36 h; after solvent degreasing is finished, drying in a forced air drying oven at 50 ℃, wherein the drying time is 5 h; then carrying out thermal degreasing under the protection of high-purity argon, wherein the thermal degreasing condition is that the temperature is raised to 150 ℃ from room temperature at the rate of 0.5 ℃/min, and the temperature is kept for 1 h; then raising the temperature to 350 ℃ at the speed of 0.5 ℃/min, and preserving the temperature for 1 h; then raising the temperature to 550 ℃ at a speed of 1 ℃/min, and preserving the temperature for 1 h; then raising the temperature to 800 ℃ at the speed of 1 ℃/min, and preserving the temperature for 0.5 h; finally, raising the temperature to 1000 ℃ at the speed of 5 ℃/min, and preserving the temperature for 1h for presintering.
S4, sintering: putting the degreased blank into a vacuum furnace for sintering, wherein the vacuum degree is 10-2Pa. The sintering process comprises the following steps: firstly, heating to 1200 ℃ at the speed of 8 ℃/min, and preserving heat for 1 h; and then heating to 1460 ℃ at the speed of 2 ℃/min, preserving the heat for 2 hours, and then cooling to room temperature along with the furnace to obtain the turbine part.
Example 4:
s1, preparation of feed: firstly, selecting TiAl-based prealloying powder and a binder, wherein: the composition of the TiAl-based prealloyed powder is 45 at.% of Al, 2 at.% of Cr, 8 at.% of Nb and the balance Ti; then selecting 65% of solid powder loading, and respectively weighing 65% of paraffin, 6% of high-density polyethylene, 8% of polypropylene, 15% of silicone resin and 6% of stearic acid in volume ratio to form a binder system;
mixing TiAl-based prealloying powder with a binder at the temperature of 170 ℃, the rotation speed of 30r/min and the time of 3 h. And taking out the feed after the mixing is finished and the temperature is cooled to room temperature, and obtaining granular feed by a crusher.
S2, injection molding: and heating the feed material in an injection machine to 175 ℃, and injecting the feed material, wherein the injection pressure is 80MPa, the pressure maintaining pressure is 100MPa, the pressure maintaining time is 25s, the mold temperature is 100 ℃, and the injection speed is 65% of the maximum injection speed of the injection machine, so that the TiAl alloy turbine blank for the engine supercharger is prepared.
S3, degreasing and pre-sintering: putting the blank into an n-heptane solution for solvent degreasing, wherein the degreasing temperature is 50 ℃, and the time is 40 h; after solvent degreasing is finished, drying in a forced air drying oven at 50 ℃, wherein the drying time is 5 h; then carrying out thermal degreasing under the protection of high-purity argon, wherein the thermal degreasing condition is that the temperature is increased to 160 ℃ from room temperature at the rate of 0.5 ℃/min, and the temperature is kept for 1 h; then raising the temperature at 360 ℃ at the speed of 0.5 ℃/min, and preserving the temperature for 1 h; then raising the temperature to 550 ℃ at a speed of 0.5 ℃/min, and preserving the heat for 1 h; then raising the temperature to 750 ℃ at the speed of 0.5 ℃/min, and preserving the heat for 1 h; finally, the temperature is raised to 1200 ℃ at the speed of 8 ℃/min, and the temperature is preserved for 1h for presintering.
S4, sintering: putting the degreased blank into a vacuum furnace for sintering, wherein the vacuum degree is 10-4Pa. The sintering process comprises the following steps: firstly, heating to 1200 ℃ at the speed of 8 ℃/min, and preserving heat for 1 h; and then raising the temperature to 1480 ℃ at the speed of 2 ℃/min, preserving the temperature for 2 hours, and then cooling to the room temperature along with the furnace to obtain the turbine workpiece.
Example 5:
s1, preparation of feed: firstly, selecting TiAl-based prealloying powder and a binder, wherein: the composition of the TiAl-based prealloyed powder comprises 43 at.% of Al, 2 at.% of Cr, 1 at.% of Nb and the balance of Ti; then selecting 65% of solid powder loading, and respectively weighing 65% of paraffin, 6% of high-density polyethylene, 8% of polypropylene, 15% of silicone resin and 6% of stearic acid in volume ratio to form a binder system;
mixing TiAl-based prealloying powder with a binder at the temperature of 170 ℃, the rotation speed of 30r/min and the time of 3 h. And taking out the feed after the mixing is finished and the temperature is cooled to room temperature, and obtaining granular feed by a crusher.
S2, injection molding: and heating the feed material in an injection machine to 175 ℃, and injecting the feed material, wherein the injection pressure is 80MPa, the pressure maintaining pressure is 100MPa, the pressure maintaining time is 25s, the mold temperature is 100 ℃, and the injection speed is 65% of the maximum injection speed of the injection machine, so that the TiAl alloy turbine blank for the engine supercharger is prepared.
S3, degreasing and pre-sintering: putting the blank into an n-heptane solution for solvent degreasing, wherein the degreasing temperature is 50 ℃, and the time is 40 h; after solvent degreasing is finished, drying in a forced air drying oven at 50 ℃, wherein the drying time is 5 h; then carrying out thermal degreasing under the protection of high-purity argon, wherein the thermal degreasing condition is that the temperature is increased to 160 ℃ from room temperature at the rate of 0.5 ℃/min, and the temperature is kept for 1 h; then raising the temperature at 360 ℃ at the speed of 0.5 ℃/min, and preserving the temperature for 1 h; then raising the temperature to 550 ℃ at a speed of 0.5 ℃/min, and preserving the heat for 1 h; then raising the temperature to 750 ℃ at the speed of 0.5 ℃/min, and preserving the heat for 1 h; finally, the temperature is raised to 1200 ℃ at the speed of 8 ℃/min, and the temperature is preserved for 1h for presintering.
S4, sintering: putting the degreased blank into a vacuum furnace for sintering, wherein the vacuum degree is 10-4Pa. The sintering process comprises the following steps: firstly, heating to 1200 ℃ at the speed of 8 ℃/min, and preserving heat for 1 h; and then raising the temperature to 1480 ℃ at the speed of 2 ℃/min, preserving the temperature for 2 hours, and then cooling to the room temperature along with the furnace to obtain the turbine workpiece.
Performance comparison experiments will be performed on the turbine parts prepared by the preparation methods of examples 1 to 5 and the turbine parts prepared by the conventional preparation process.
First, experimental object
The turbine parts prepared in examples 1-5 and the turbine parts prepared in comparative examples 1-5, wherein:
comparative example 1:
the binder system was constructed by using TiAl-based prealloyed powder of the same composition as in example 1, then selecting a solid powder loading of 65% and weighing 65% paraffin wax, 15% high density polyethylene, 15% polypropylene and 5% stearic acid by volume, respectively.
Then preparing a feeding material, performing injection molding, degreasing, pre-sintering and sintering in sequence, wherein the thermal degreasing condition is as follows: heating the mixture to 180 ℃ from room temperature at a speed of 1 ℃/min, and preserving heat for 1h to carry out first-stage thermal degreasing; raising the temperature to 350 ℃ at the speed of 0.5 ℃/min, and preserving the temperature for 1h to carry out second-stage thermal degreasing; then heating to 500 ℃ at the speed of 1 ℃/min, and preserving heat for 1h to carry out third-stage thermal degreasing; then raising the temperature to 1100 ℃ at the speed of 5 ℃/min, and preserving the temperature for 1h for presintering.
It was detected that in comparative example 1, from the third stage of thermal degreasing to the pre-sintering stage, the degreased green body blade was largely collapsed and deformed, and the shape thereof could not be maintained.
Comparative example 2:
the turbine part is prepared by the same preparation process as that of the example 1, except that the contents of the components in the binder system are different, particularly the content of the silicone resin is lower, specifically, 65% of paraffin wax, 17% of high-density polyethylene, 10% of polypropylene, 3% of silicone resin and 5% of stearic acid are weighed respectively to form the binder system.
According to the detection, in the comparative example 2, from the fourth stage of thermal degreasing to the pre-sintering stage, the degreased green body blade deforms seriously, and has a large number of cracks, which does not meet the use requirement.
Comparative example 3:
the turbine part is prepared by the same preparation process as that of the example 1, except that the contents of the components in the binder system are different, particularly the content of the silicone resin is higher, specifically, 65% of paraffin wax, 5% of high-density polyethylene, 6% of polypropylene, 19% of silicone resin and 5% of stearic acid are weighed respectively to form the binder system.
Comparative example 4:
a turbine part was prepared using the same manufacturing process as in example 1, except that the TiAl-based prealloyed powder had a different composition content, with 49 at.% Al, 2 at.% Cr, 8.5 at.% Nb, and the balance Ti.
Comparative example 5:
a turbine part was prepared using the same manufacturing process as in example 1, except that the TiAl-based prealloyed powder had a different composition content, with 42 at.% Al, 2 at.% Cr, 1 at.% Nb, and the balance Ti.
Second, Experimental methods
The performance of the turbine parts prepared in examples 1 to 5 and comparative examples 1 to 5 was measured by a conventional inspection method of the prior art.
And (3) performance detection:
(1) and (3) testing the relative density: the turbine parts prepared in examples 1 to 5 and comparative examples 1 to 5 were subjected to relative density measurement.
(2) And (3) testing mechanical properties: the turbine parts prepared in examples 1 to 5 and comparative examples 1 to 5 were measured for tensile strength and elongation at room temperature, respectively.
Third, experimental results
Through detection, the TiAl alloy turbine prepared by the preparation method in the embodiments 1-5 has fine grains, uniform structure and Ti2AlC and Ti5Si3Enhanced alpha2A/gamma full lamellar organization structure; wherein, Ti2AlC and Ti5Si3The particle size of (A) is 1 to 3 μm; alpha is alpha2Alpha in a/gamma full lamellar structure2The phase and the gamma phase are both of lath structures; alpha is alpha2The phase accounts for 10-20% by mass, and the gamma phase accounts for 80-90% by mass.
The experimental results of examples 1 to 5 and comparative examples 1 to 5 are summarized below and shown in Table 1.
TABLE 1 comparison of the Properties of turbine parts obtained in examples 1-5 and comparative examples 1-5
Through data comparison, in the comparative example 1, from the third stage of thermal degreasing to the pre-sintering stage, the degreased green body blade is largely collapsed and deformed, and the shape of the degreased green body blade cannot be maintained; in embodiments 1-5 of the invention, the silicone resin skeleton agent with low melting and high decomposition temperature is introduced, so that the stability of the TiAl alloy turbine green compact in the thermal degreasing process is effectively improved, and the injection molding process preparation of the TiAl turbine with a high complex shape is ensured. At the same time, designed and preparedTi2AlC、Ti5Si3Enhanced alpha2The/gamma full lamellar structure ensures that the TiAl alloy supercharger turbine has excellent comprehensive mechanical properties. In addition, the TiAl turbine for a turbocharger prepared in comparative example 4 had a near- γ structure mainly composed of γ equiaxed crystals, although the grains were fine and had a uniform structure, and Ti was present in the matrix structure2AlC and Ti5Si3The particle size of the reinforcing phase is about 1 mu m, and the compactness, the room-temperature tensile strength and the elongation are relatively low; it can also be seen that the change of any one of the components in the TiAl-based prealloyed powder of the present invention will directly affect the microstructure of the TiAl turbine for the supercharger; in addition, the lack or change of any component in the binding agent and the change of the proportion of the components cannot endow the turbine blank with strong shape-preserving capability so as to solve the problem that the turbine blank is easy to collapse in the thermal degreasing process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The product is characterized in that the product is a TiAl alloy turbine, and the TiAl alloy turbine is provided with Ti2AlC and Ti5Si3Enhanced alpha2A/gamma full lamellar structure; wherein, the Ti2AlC and Ti5Si3The particle size of the inorganic particles is 1-3 mu m; a is said2Alpha in a/gamma full lamellar structure2The phase and the gamma phase are both of lath structures; a is said2The phase accounts for 10-20% by mass, and the gamma phase accounts for 80-90% by mass.
2. A method of injection molding the article of claim 1, comprising the steps of:
s1, preparation of feed: mixing TiAl-based prealloying powder and a binder according to a certain proportion, and crushing to form granular feed;
s2, injection molding: injecting and forming the feed material on an injection machine to obtain a turbine blank;
s3, degreasing and pre-sintering: degreasing and presintering the turbine blank;
s4, sintering: and sintering the turbine blank degreased and presintered in the step S3, and cooling along with the furnace to obtain the turbine product.
3. The injection molding method of manufacturing an article according to claim 2, wherein the binder comprises the following components in volume percent: 50-70% of paraffin, 3-15% of high-density polyethylene, 5-10% of polypropylene, 5-10% of stearic acid and 5-17% of silicone resin.
4. The injection-molding production method of an article according to claim 2, wherein in the step S1, the binder is contained in an amount of 60 to 65 vol.%; the TiAl-based prealloyed powder comprises the following components in atomic percentage: the Al content is 43-49 at.%, the Cr content is 0-5 at.%, the Nb content is 1-8 at.%, and the balance is Ti.
5. The injection molding preparation method of the product according to claim 2, wherein in the step S1, the mixing temperature is 150-190 ℃, the rotation speed is 10-30 r/min, and the time is 1-2 h; and cutting the mixture into granules by a crusher after the mixing is finished.
6. The injection molding preparation method of a product according to claim 2, wherein in the step S2, the feed material is heated to 120 to 175 ℃, the injection pressure is 40 to 80MPa, the pressure maintaining pressure is 40 to 100MPa, the pressure maintaining time is 5 to 25S, the mold temperature is 50 to 100 ℃, and the injection speed is 50 to 80% of the maximum injection speed of the injection machine.
7. The injection molding production method of the product according to claim 2, wherein in the step S3, the degreasing treatment includes a solvent degreasing process and a thermal degreasing process, and the thermal degreasing process is performed under an inert gas atmosphere; the pre-sintering treatment process is carried out at the temperature of 800-1200 ℃ at the speed of 2-10 ℃/min, and the temperature is kept for 0.5-1.5 h.
8. The injection molding preparation method of the product according to claim 7, wherein the degreasing solvent in the solvent degreasing process is n-heptane or trichloroethylene, the degreasing temperature is 40-55 ℃, and the degreasing time is 18-48 h; and after degreasing, drying at the temperature of 45-55 ℃, wherein the drying time is 4-12 h.
9. The injection molding preparation method of the product according to claim 8, wherein the thermal degreasing process is a first stage thermal degreasing process which is carried out by raising the temperature from room temperature to 150-200 ℃ at a speed of 0.5-2 ℃/min and keeping the temperature for 0.5-1.5 h; raising the temperature to 300-400 ℃ at a speed of 0.5-1.5 ℃/min, and keeping the temperature for 0.5-1.5 h to carry out second-stage thermal degreasing; heating to 450-600 ℃ at a speed of 0.5-2 ℃/min, and preserving heat for 0.5-1.5 h to carry out third-stage thermal degreasing; heating to 600-800 ℃ at a speed of 0.5-2 ℃/min, and keeping the temperature for 0.5-1.5 h to perform thermal degreasing at the fourth stage.
10. The injection molding method for producing an article according to claim 2, wherein in the step S4, the sintering process is performed under an inert gas atmosphere or under a vacuum condition, wherein a vacuum degree is 10-2～10-4Pa; heating the mixture from room temperature to 1000-1200 ℃ at a speed of 2-10 ℃/min, and preserving heat for 0.5-2 h to carry out first-stage sintering; and then heating to 1400-1550 ℃ at the rate of 1-3 ℃/min, and keeping the temperature for 1-4 h, and carrying out second-stage sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119468.8ACN111266571B (en) | 2020-02-26 | 2020-02-26 | Adhesive, TiAl alloy turbine injection molding preparation method and product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010119468.8ACN111266571B (en) | 2020-02-26 | 2020-02-26 | Adhesive, TiAl alloy turbine injection molding preparation method and product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111266571A CN111266571A (en) | 2020-06-12 |
| CN111266571Btrue CN111266571B (en) | 2021-03-19 |
Family
ID=70991344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010119468.8AActiveCN111266571B (en) | 2020-02-26 | 2020-02-26 | Adhesive, TiAl alloy turbine injection molding preparation method and product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111266571B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112632716A (en)* | 2020-11-17 | 2021-04-09 | 北京科技大学 | Defect visualization analysis method for preparing turbine through powder injection molding and preparation method of titanium-aluminum alloy turbine |
| CN114682778B (en)* | 2022-02-23 | 2023-06-02 | 北京科技大学 | Method for preparing titanium-based workpiece based on superfine spherical titanium-based powder and titanium-based workpiece |
| CN116574934A (en)* | 2023-04-10 | 2023-08-11 | 北京科技大学 | Fine-grain high-density TiAl alloy part and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7691174B2 (en)* | 2004-03-08 | 2010-04-06 | Battelle Memorial Institute | Feedstock composition and method of using same for powder metallurgy forming a reactive metals |
| CN103240418B (en)* | 2013-05-23 | 2014-12-24 | 北京科技大学 | Near-net shaping method for charging turbine with hollow internal structure |
| CN104084586B (en)* | 2014-06-05 | 2017-02-15 | 浙江大学 | Filter-pressing preparation method for soft-magnetic composite material |
| CN105803255B (en)* | 2016-03-29 | 2017-05-03 | 齐鲁工业大学 | High-niobium titanium aluminum-base supercharger turbine and manufacturing method thereof |
- 2020
- 2020-02-26CNCN202010119468.8Apatent/CN111266571B/enactiveActive
Also Published As
| Publication number | Publication date |
|---|---|
| CN111266571A (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111266571B (en) | Adhesive, TiAl alloy turbine injection molding preparation method and product | |
| CN102251131A (en) | Method for preparing injection-molding nickel-base ODS (oxide dispersion strengthened) alloy | |
| CN110935878A (en) | Injection molding method of titanium alloy part | |
| CN103240418A (en) | Near-net shaping method for charging turbine with hollow internal structure | |
| CN112143924B (en) | A kind of preparation method of multi-scale high-strength high-entropy alloy material for corrosive environment | |
| JP2002523630A (en) | Powder metal injection molding method for manufacturing products from nickel-based superalloy "Hastelloy X" | |
| CN107400802A (en) | A kind of increasing material manufacturing titanium aluminium base alloy dusty material and preparation method thereof | |
| CN113930696B (en) | A kind of preparation method of light-weight titanium-rich Ti-Zr-Nb-Al system refractory high-entropy alloy-based composite material | |
| CN113061766A (en) | A method for improving high temperature strength of tungsten-rhenium alloy | |
| CN100448795C (en) | Multiple-phase ceramic material and method for manufacturing same | |
| CN111304479A (en) | A kind of preparation method of VCrNbMoW refractory high entropy alloy | |
| CN116790959A (en) | In-situ self-generated micro-nano double-scale nitride reinforced superalloy and preparation method thereof | |
| CN110449580B (en) | A powder metallurgy high-strength and toughness boron-containing high-entropy alloy material and its preparation method and application | |
| CN107937753B (en) | A kind of TiAl duplex grain structure alloy and preparation method with bimodal character | |
| Tabie et al. | Microstructure and mechanical properties of particle reinforced high-temperature titanium composites | |
| CN118326222B (en) | High-performance composite binder phase hard alloy and preparation method thereof | |
| CN114682778A (en) | Method for preparing titanium-based product based on fine spherical titanium-based powder and titanium-based product | |
| CN100449023C (en) | Supercharger turbine and manufacturing method thereof | |
| CN113046613A (en) | High-strength non-magnetic light TiC-based metal ceramic material and preparation method thereof | |
| CN105039793B (en) | A kind of nanofeature reinforced aluminum matrix composites and preparation method thereof | |
| CN115353395B (en) | Preparation of Ti 2 AlC/B 4 Method for C complex phase ceramic | |
| CN113278848B (en) | A kind of SPS sintered particle reinforced Ti-Al-Sn-Zr series high temperature resistant titanium matrix composite material and preparation method thereof | |
| CN111893337B (en) | Preparation method of high-temperature alloy | |
| CN116555630A (en) | ODS nickel-based superalloy and its preparation method and application | |
| CN116574934A (en) | Fine-grain high-density TiAl alloy part and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |