CN111763841B - Powder metallurgy titanium or titanium alloy product and method for preparing the same in short process - Google Patents

Abstract

Translated fromChinese

本发明提供了一种粉末冶金钛或钛合金制品及其短流程制备方法，该制备方法包括以下步骤：选取钛或钛合金为原料，并且所述原料的至少一个维度的尺寸≤5mm；将所述原料进行不饱和氢化处理；将经过不饱和氢化处理后的所述原料进行低温破碎处理，得到不饱和氢化钛粉末；将所述不饱和氢化钛粉末依次进行成形及烧结处理，得到钛或钛合金制品。该制备方法利用部分吸氢后物料的脆性并结合低温破碎技术将物料破碎为粉末，后续将粉末直接冷等静压成形和真空烧结致密化制备钛及钛合金材料，省略了脱氢过程，实现了短流程制备粉末钛合金产品，成材率高，成本低，产品性能优异。The invention provides a powder metallurgy titanium or titanium alloy product and a short-flow preparation method thereof. The preparation method includes the following steps: selecting titanium or titanium alloy as a raw material, and the size of at least one dimension of the raw material is ≤5 mm; The raw material is subjected to unsaturated hydrogenation treatment; the raw material after the unsaturated hydrogenation treatment is subjected to low-temperature crushing treatment to obtain unsaturated titanium hydride powder; the unsaturated titanium hydride powder is sequentially formed and sintered to obtain titanium or titanium hydride Alloy products. The preparation method utilizes the brittleness of the material after partial hydrogen absorption and combines the low-temperature crushing technology to crush the material into powder, and then directly cold isostatic pressing of the powder and vacuum sintering densification to prepare titanium and titanium alloy materials, omitting the dehydrogenation process, realizing The powder titanium alloy product is prepared in a short process, with high yield, low cost and excellent product performance.

Description

Powder metallurgy titanium or titanium alloy product and short-process preparation method thereof

Technical Field

The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy titanium or titanium alloy product and a short-process preparation method thereof.

Background

Titanium and titanium alloy have excellent comprehensive properties, such as small density, high specific strength, good fatigue strength, good crack expansion resistance and excellent corrosion resistance, so that the titanium and titanium alloy have increasingly wide application prospects in weaponry such as ships, weapons, aviation, aerospace and the like. However, the high production and processing cost of titanium is a main reason for limiting the wide application of titanium, so that the low cost is a general trend of the development of the titanium industry at present. Powder metallurgy is an effective method for preparing low-cost and high-performance titanium and titanium alloy in a short process, compact titanium alloy materials are not prepared by melting, and the problem of melting titanium as refractory metal is solved; meanwhile, the near-net forming characteristic and the microstructure advantage reduce raw materials required by manufacturing final products and cogging forging processes, and solve the problems of low utilization rate of the smelting titanium alloy material and difficult hot working.

The Hydrogenation Dehydrogenation (HDH) titanium powder can be used for preparing powder metallurgy titanium alloy products, but the structure performance advantage of the powder metallurgy products cannot be exerted due to the influence of factors such as high interstitial atom content, low sintering compactness, large microstructure and the like. The current research shows that a proper amount of hydrogen can purify an oxide film on the surface of the powder in the sintering process of the HDH titanium powder, so that the sintering compactness is promoted, and meanwhile, the hydrogen can be used as a temporary alloy element to refine the microstructure of the titanium alloy. Therefore, (method CN101934373B) direct sintering using titanium hydride powder is used for preparing powder titanium alloy products, but in the aspect of practical engineering application, excessive hydrogen content not only causes the powder formability to be deteriorated, but also causes sintering cracking phenomenon of large-size blanks. For this reason, the researchers have proposed a sintering method (CN106191493A) of titanium powder doped with titanium hydride powder and a sintering method (CN107034375A) of partially dehydrogenated unsaturated titanium hydride sequentially, but both methods require dehydrogenation of titanium hydride powder, have long dehydrogenation time and low efficiency, and have serious powder hardening phenomenon, which is not favorable for preparation of ultrafine powder, so that the application of titanium alloy powder based on titanium hydride and titanium powder is severely restricted.

Disclosure of Invention

The invention mainly aims to provide a powder metallurgy titanium or titanium alloy product and a short-flow preparation method thereof, wherein the preparation method comprises the steps of crushing a material into powder by utilizing the brittleness of the material after partial hydrogen absorption and combining a low-temperature crushing technology, then preparing titanium and titanium alloy materials by directly carrying out cold isostatic pressing forming and vacuum sintering densification on the powder, and omitting a dehydrogenation process so as to solve the technical problem of low efficiency caused by dehydrogenation treatment in the preparation process of the powder metallurgy titanium or titanium alloy product in the prior art.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a short-flow production method of a powder metallurgy titanium or titanium alloy article.

The short-process preparation method of the powder metallurgy titanium or titanium alloy comprises the following steps:

s1: preparing a raw material, namely selecting titanium or titanium alloy as the raw material, wherein the size of at least one dimension of the raw material is less than or equal to 5 mm;

s2: hydrogenation, namely, carrying out unsaturated hydrogenation treatment on the raw material in the step S1;

s3: crushing, namely performing low-temperature crushing treatment on the raw material subjected to the unsaturated hydrogenation treatment in the step S2 to obtain unsaturated titanium hydride powder;

s4: and (4) sequentially carrying out forming and sintering treatment on the unsaturated titanium hydride powder obtained in the step (S3) to obtain a titanium or titanium alloy product.

Further, in step S1, the raw material is in the form of a flat sheet, and the raw material is titanium chips, titanium alloy chips, or rolled titanium sponge sheets.

Further, in step S1, the rolled titanium sponge sheet has a thickness of 1 to 5 mm; the titanium alloy scraps are Ti-6Al-4V alloy scraps.

Further, in step S2, the hydrotreating process includes:

s2-1: vacuum pumping is carried out to 10^-3～10^-1Pa, heating to 450-550 ℃, and preserving heat for 30-60 min;

s2-2: introducing high-purity hydrogen and controlling the hydrogen absorption amount;

s2-3: and carrying out hydrogen homogenization treatment.

Further, in step S2-2, the hydrogen absorption amount is controlled to be 1.0 to 2.5 wt.%.

Further, in step S2-3, the hydrogen homogenization treatment specifically includes: after the hydrogen introduction is stopped, the temperature is raised to 550-850 ℃ again, and the temperature is kept for 2-5 h.

Further, in step S3, the cryogenic crushing treatment adopts a cryogenic mechanical crushing process, wherein the cryogenic medium is liquid argon.

Further, in step S3, the particle size of the unsaturated titanium hydride powder is 10 to 75 μm.

Further, in step S4, the forming process is performed by using a cold isostatic pressing process, wherein the pressing pressure is 150 to 200MPa, and the pressure maintaining time is 10 to 30S.

Further, in step S4, the sintering process specifically includes: and carrying out vacuum sintering densification on the blank obtained by the cold isostatic pressing forming process by adopting a sectional sintering process.

Further, the step sintering process specifically comprises the following steps:

the first section is heated to 550-750 ℃, the heating rate is 2 ℃/min, the temperature is kept for 2-10 h, and the removal of the residual hydrogen content is completed;

and heating the second section to 1150-1300 ℃, wherein the heating rate is 5 ℃/min, the sintering time is 2-5 h, and the densification is completed.

To achieve the above object, according to a second aspect of the present invention, there is provided a powder metallurgy titanium or titanium alloy article.

The titanium or titanium alloy product is prepared by the short-process preparation method of the powder metallurgy titanium or titanium alloy.

According to the invention, the flaky material is adopted to partially absorb hydrogen, the brittleness of the partially-absorbed material is utilized and the low-temperature crushing technology is combined to crush the material into powder, and then the powder is directly subjected to cold isostatic pressing forming and vacuum sintering densification to prepare the titanium and titanium alloy material, so that the dehydrogenation process is omitted.

Compared with titanium hydride powder, the powder partially absorbing hydrogen has better formability, and the problem of cracking of a large-size sintered blank is avoided; compared with hydrogenated dehydrogenated titanium powder, the hydrogenated dehydrogenated titanium powder has the advantages that the sintering density is improved, the oxygen content of a sintered blank is reduced, and the microstructure of the material is obviously refined.

Therefore, the invention realizes the short-process preparation of the powder titanium alloy product, and has the advantages of high yield, low cost and excellent product performance.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below. While exemplary embodiments of the present disclosure have been shown, it should be understood that the present disclosure may be embodied in various forms and should not be limited by 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 a short-process preparation method of a powder metallurgy titanium or titanium alloy product, which comprises the following steps:

s1: preparing a raw material, namely selecting titanium or titanium alloy as the raw material, wherein the size of at least one dimension of the raw material is less than or equal to 5 mm; wherein: the selected raw materials are in a flat sheet shape, and the raw materials are preferably titanium chips, titanium alloy chips or rolled titanium sponge sheets; the thickness of the rolled titanium sponge sheet is 1-5 mm; the titanium alloy chips include Ti-6Al-4V alloy chips.

S2: hydrogenation, namely loading the selected raw materials into a rotary hydrogenation furnace for unsaturated hydrogenation treatment; the specific process comprises the following steps:

vacuum pumping is carried out to 10^-3～10^-1Pa, heating to 450-550 ℃, and preserving heat for 30-60 min; then introducing high-purity hydrogen, starting to absorb hydrogen, controlling the hydrogen absorption amount to be 1.0-2.5 wt.%, and stopping introducing hydrogen when the set hydrogen absorption amount is reached; and then raising the temperature to 550-850 ℃, and preserving the heat for 2-5 hours to carry out hydrogen homogenization treatment.

S3: crushing, namely crushing the raw material subjected to the unsaturated hydrogenation treatment in the step S2 by adopting a low-temperature mechanical crushing process to obtain unsaturated titanium hydride powder; wherein the low-temperature medium is liquid argon; the particle size of the unsaturated titanium hydride powder is 10 to 75 μm.

S4: forming, namely filling the unsaturated titanium hydride powder obtained in the step S3 into a rubber sleeve, and forming by adopting a cold isostatic pressing forming process; wherein the pressing pressure is 150-200 MPa, and the pressure maintaining time is 10-30 s, so that the cold isostatic pressing blank is obtained.

S5: and sintering, namely performing vacuum sintering densification on the cold isostatic pressing blank obtained in the step S4, wherein the sintering treatment adopts a sectional sintering process, and specifically comprises the following steps: the first section is heated to 550-750 ℃, the heating rate is 2 ℃/min, the temperature is kept for 2-10 h, and the removal of the residual hydrogen content is completed; and heating the second section to 1150-1300 ℃, wherein the heating rate is 5 ℃/min, the sintering time is 2-5 h, and densification is completed to obtain the titanium or titanium alloy product.

The short-flow preparation method of the powder metallurgy titanium or titanium alloy product in the application is described in detail by specific examples.

Example 1:

s1: the method comprises the steps of preparing raw materials, weighing 100kg of flat sheet raw materials with the thickness of 5mm formed by cold rolling of high-quality sponge titanium, cleaning and drying in vacuum to avoid oil pollution.

S2: hydrogenation, putting the raw materials into a hydrogenation furnace, and vacuumizing to 10 DEG^-3～10^-1Pa, heating to 500 ℃, keeping the temperature for 30min, and then stopping heating; then introducing high-purity hydrogen, starting hydrogen absorption, controlling the hydrogen absorption amount to be 2.5 wt.%, and stopping introducing hydrogen; raising the temperature to 600 ℃ again, and preserving the heat for 2h for hydrogen homogenization treatment.

S3: crushing, namely performing low-temperature mechanical crushing on the raw material treated in the step S2, wherein a low-temperature medium is liquid argon, and sealing and screening the crushed raw material to obtain powder particles with the particle size of less than or equal to 75 microns; preference is given to powder particles having a particle size of <30 μm.

S4: and (4) forming, namely filling the unsaturated titanium hydride powder obtained in the step (S3) into a rubber sheath, and forming by adopting cold isostatic pressing, wherein the pressing pressure is 200MPa, and the pressure maintaining time is 10S.

S5: and sintering, namely performing vacuum sintering densification on the cold isostatic pressing blank obtained in the step S4, wherein the sintering process adopts sectional sintering. Wherein: the first stage is heated to 700 ℃, the heating rate is 2 ℃/min, the temperature is kept for 10h, and the removal of the residual hydrogen content is completed; the second stage is heated to 1200 ℃, the heating rate is 5 ℃/min, and the sintering time is 2 h.

Example 2:

s1: preparing raw materials, weighing 100kg of high-quality Ti-6Al-4V titanium chips, cleaning, and drying in vacuum to avoid oil pollution.

S2: hydrogenation, putting the raw materials into a hydrogenation furnace, and vacuumizing to 10 DEG^-3～10^-1Pa, heating to 500 ℃, keeping the temperature for 30min, and then stopping heating; then introducing high-purity hydrogen, starting hydrogen absorption, controlling the hydrogen absorption amount to be 2 wt.%, and stopping introducing hydrogen; raising the temperature to 650 ℃ again, preserving the heat for 2 hours, and carrying out hydrogen homogenization treatment;

s3: crushing, namely performing low-temperature mechanical crushing on the raw material treated in the step S2, wherein a low-temperature medium is liquid argon, and sealing and screening the crushed raw material to obtain powder particles with the particle size of less than or equal to 75 microns; preference is given to powder particles having a particle size of < 20 μm.

S4: and (4) forming, namely filling the unsaturated titanium hydride powder obtained in the step (S3) into a rubber sheath, and forming by adopting cold isostatic pressing, wherein the pressing pressure is 180MPa, and the pressure maintaining time is 10S.

S5: and sintering, namely performing vacuum sintering densification on the cold isostatic pressing blank obtained in the step S4, wherein the sintering process adopts sectional sintering. Wherein: the first stage is heated to 650 ℃, the heating rate is 2 ℃/min, the temperature is kept for 10h, and the removal of the residual hydrogen content is completed; the second stage is heated to 1250 ℃, the heating rate is 5 ℃/min, and the sintering time is 2 h.

Example 3:

s1: preparing raw materials, weighing 100kg of high-quality Ti-6Al-4V titanium chips, cleaning, and drying in vacuum to avoid oil pollution.

S2: hydrogenation, putting the raw materials into a hydrogenation furnace, and vacuumizing to 10 DEG^-3～10^-1Pa, heating to 550 ℃, and stopping heating after keeping the temperature for 60 min; then introducing high-purity hydrogen, starting hydrogen absorption, controlling the hydrogen absorption amount to be 1 wt.%, and stopping introducing hydrogen; raising the temperature to 850 ℃ again, preserving the heat for 5 hours, and carrying out hydrogen homogenization treatment;

s3: crushing, namely performing low-temperature mechanical crushing on the raw material treated in the step S2, wherein a low-temperature medium is liquid argon, and sealing and screening the crushed raw material to obtain powder particles with the particle size of less than or equal to 75 microns; preference is given to powder particles having a particle size of <30 μm.

S4: and (4) forming, namely filling the unsaturated titanium hydride powder obtained in the step (S3) into a rubber sheath, and forming by adopting cold isostatic pressing, wherein the pressing pressure is 150MPa, and the pressure maintaining time is 30S.

S5: and sintering, namely performing vacuum sintering densification on the cold isostatic pressing blank obtained in the step S4, wherein the sintering process adopts sectional sintering. Wherein: the first stage is heated to 550 ℃, the heating rate is 2 ℃/min, the temperature is kept for 5h, and the removal of the residual hydrogen content is completed; the second stage is heated to 1250 ℃, the heating rate is 5 ℃/min, and the sintering time is 5 h.

Example 4:

s1: preparing raw materials, weighing 100kg of flat sheet raw materials with the thickness of 2mm formed by cold rolling of high-quality sponge titanium, cleaning, and drying in vacuum to avoid oil pollution.

S2: hydrogenation, putting the raw materials into a hydrogenation furnace, and vacuumizing to 10 DEG^-3～10^-1Pa, heating to 450 ℃, keeping the temperature for 50min, and then stopping heating; then introducing high-purity hydrogen, starting hydrogen absorption, controlling the hydrogen absorption amount to be 1.5 wt.%, and stopping introducing hydrogen; raising the temperature to 550 ℃ again, preserving the heat for 3.5 hours, and carrying out hydrogen homogenization treatment;

s3: crushing, namely performing low-temperature mechanical crushing on the raw material treated in the step S2, wherein a low-temperature medium is liquid argon, and sealing and screening the crushed raw material to obtain powder particles with the particle size of less than or equal to 75 microns; preference is given to powder particles having a particle size of < 20 μm.

S4: and (4) forming, namely filling the unsaturated titanium hydride powder obtained in the step (S3) into a rubber sheath, and forming by adopting cold isostatic pressing, wherein the pressing pressure is 150MPa, and the pressure maintaining time is 20S.

S5: and sintering, namely performing vacuum sintering densification on the cold isostatic pressing blank obtained in the step S4, wherein the sintering process adopts sectional sintering. Wherein: in the first stage, the temperature is heated to 750 ℃, the heating rate is 2 ℃/min, and the temperature is kept for 2h, so that the removal of the residual hydrogen content is completed; the second stage is heated to 1300 ℃, the heating rate is 5 ℃/min, and the sintering time is 3.5 h.

The following performance comparison experiments were performed on the titanium or titanium alloy products prepared by the preparation methods of examples 1 to 4 and the titanium or titanium alloy products prepared by the conventional preparation process.

First, experimental object

The titanium or titanium alloy articles prepared in examples 1-4 and the titanium or titanium alloy articles prepared in comparative examples 1-3, wherein:

comparative example 1:

the raw material in the comparative example 1 is non-rolled sponge titanium with the granularity of 0.83-25.4 mm; the remaining preparation process was carried out according to the preparation process in example 1.

Comparative example 2:

in comparative example 2, a block titanium material with the thickness of more than 5mm is selected as the raw material; the remaining preparation process was carried out according to the preparation process in example 1.

Comparative example 3:

the crushing treatment process in comparative example 3 was normal temperature mechanical crushing; the remaining preparation process was carried out according to the preparation process in example 1.

Second, Experimental methods

The performance of the products prepared in examples 1 to 4 and comparative examples 1 to 3 was measured by a conventional inspection method of the prior art.

And (3) testing the relative density: the relative density measurements were performed on the products prepared in examples 1 to 4 and comparative examples 1 to 3.

Third, test results

The experimental results of examples 1 to 4 and comparative examples 1 to 3 are summarized in tables 1 to 3.

TABLE 1 summary of the properties of the preparation processes and articles of examples 1-4

As can be seen from Table 1, the titanium or titanium alloy products obtained by the preparation method in the embodiments 1 to 4 of the present application have high compactness, and the yield of the fine powder with the particle size of less than 30 μm after the crushing treatment in the embodiments 1 to 4 is high.

TABLE 2 comparison of the properties of the articles of example 1 and comparative examples 1-2

As can be seen from Table 2, in comparative example 1 and comparative example 2, since the titanium sponge and the bulk titanium material which were not rolled were used as the raw materials, hydrogen was not sufficiently absorbed, the core portions of the titanium sponge and the bulk titanium material did not reach the brittleness required for crushing, the crushing was extremely difficult to perform, the yield of fine powder with a particle size of less than 30 μm was less than 50%, and the density of the finally obtained pure titanium and Ti-6Al-4V alloy was less than 95%.

Table 3 comparison of the preparation and article properties of example 1 and comparative example 3

As can be seen from table 3, since the normal temperature mechanical crushing process is adopted in comparative example 3, the material has the phenomena of cold welding, adhesion and the like during the crushing process, the service life of the crushing equipment is reduced, the yield of the fine powder is low, and the density of the finally obtained pure titanium is lower than 95%.

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 (8)

Translated fromChinese

1.一种粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，包括以下步骤：1. a short-flow preparation method of powder metallurgy titanium or titanium alloy product, is characterized in that, comprises the following steps:S1：原料准备，选取钛或钛合金为原料，并且所述原料的至少一个维度的尺寸≤5mm；S1: raw material preparation, select titanium or titanium alloy as raw material, and the size of at least one dimension of the raw material is ≤5mm;S2：氢化，将步骤S1所述的原料进行不饱和氢化处理；所述氢化处理工艺包括：S2: hydrogenation, the raw material described in step S1 is subjected to unsaturated hydrogenation treatment; the hydrogenation treatment process includes:S2-1：抽真空至10^-3～10^-1Pa，加热至450～550℃，并保温30～60min；S2-1: Evacuate to 10^-3 ~ 10^-1 Pa, heat to 450 ~ 550 ℃, and keep warm for 30 ~ 60min;S2-2：通入高纯氢气，并控制吸氢量为1.0～2.5wt.％；S2-2: feed high-purity hydrogen, and control the hydrogen absorption to be 1.0-2.5wt.%;S2-3：进行氢均匀化处理；S2-3: carry out hydrogen homogenization treatment;S3：破碎，将经过步骤S2不饱和氢化处理后的所述原料进行低温破碎处理，得到不饱和氢化钛粉末；S3: crushing, performing low-temperature crushing treatment on the raw material after the unsaturated hydrogenation treatment in step S2 to obtain unsaturated titanium hydride powder;S4：将步骤S3得到的不饱和氢化钛粉末依次进行成形及烧结处理，得到钛或钛合金制品。S4: The unsaturated titanium hydride powder obtained in step S3 is sequentially formed and sintered to obtain a titanium or titanium alloy product.2.根据权利要求1所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，步骤S2-3中，氢均匀化处理具体为：停止通氢后重新升温至550～850℃，并保温2～5h。2 . The short-flow preparation method of powder metallurgy titanium or titanium alloy products according to claim 1 , wherein, in step S2-3, the hydrogen homogenization treatment is specifically: after stopping the hydrogen supply, the temperature is reheated to 550-850° C. 2 . , and keep warm for 2-5h.3.根据权利要求1所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，步骤S3中，所述低温破碎处理采用低温机械破碎工艺，其中，低温介质为液氩。3 . The short-flow preparation method for powder metallurgy titanium or titanium alloy products according to claim 1 , wherein, in step S3 , the cryogenic crushing treatment adopts a cryogenic mechanical crushing process, wherein the cryogenic medium is liquid argon. 4 .4.根据权利要求1所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，步骤S3中，所述不饱和氢化钛粉末的粒度为10～75μm。4 . The short-flow preparation method for powder metallurgy titanium or titanium alloy products according to claim 1 , wherein, in step S3 , the particle size of the unsaturated titanium hydride powder is 10-75 μm. 5 .5.根据权利要求1所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，步骤S4中，所述成形处理采用冷等静压成形工艺，其中，压制压力为150～200MPa，保压时间10～30s。5 . The short-flow preparation method for powder metallurgy titanium or titanium alloy products according to claim 1 , wherein, in step S4 , the forming process adopts a cold isostatic pressing forming process, wherein the pressing pressure is 150-200 MPa. 6 . , the holding time is 10 to 30s.6.根据权利要求5所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，步骤S4中，所述烧结处理具体为：采用分段烧结工艺将所述冷等静压成形工艺得到的坯料进行真空烧结致密化。6 . The short-flow preparation method for powder metallurgy titanium or titanium alloy products according to claim 5 , wherein, in step S4 , the sintering treatment is specifically: adopting a segmented sintering process to form the cold isostatic pressing. 7 . The blank obtained by the process is densified by vacuum sintering.7.根据权利要求6所述的粉末冶金钛或钛合金制品的短流程制备方法，其特征在于，所述分段烧结工艺具体为：7. The short-flow preparation method of powder metallurgy titanium or titanium alloy products according to claim 6, wherein the segmented sintering process is specifically:第一段加热至550～750℃，升温速率为2℃/min，保温2～10h，完成残余氢含量的脱出；The first stage is heated to 550-750 °C, the heating rate is 2 °C/min, and the temperature is kept for 2-10 h to complete the removal of the residual hydrogen content;第二段加热至1150～1300℃，升温速率为5℃/min，烧结时间为2～5h，完成致密化。The second stage is heated to 1150-1300°C, the heating rate is 5°C/min, the sintering time is 2-5h, and the densification is completed.8.利用权利要求1～7任一项所述的粉末冶金钛或钛合金制品的短流程制备方法制得的粉末冶金钛或钛合金制品。8. A powder metallurgy titanium or titanium alloy product prepared by using the short-flow preparation method of powder metallurgy titanium or titanium alloy product according to any one of claims 1 to 7.