CN111763841A - Powder metallurgy titanium or titanium alloy product and short-process preparation method thereof - Google Patents
Powder metallurgy titanium or titanium alloy product and short-process preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
- C22C1/0458—Alloys based on titanium, zirconium or hafnium
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- 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
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
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- 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
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- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/023—Hydrogen absorption
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- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C14/00—Alloys based on titanium
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Abstract
The invention provides a powder metallurgy titanium or titanium alloy product and a short-process preparation method thereof, wherein the preparation method comprises the following steps: selecting titanium or titanium alloy as a raw material, wherein the size of at least one dimension of the raw material is less than or equal to 5 mm; subjecting the feedstock to an unsaturated hydrogenation treatment; carrying out low-temperature crushing treatment on the raw material subjected to unsaturated hydrogenation treatment to obtain unsaturated titanium hydride powder; and sequentially forming and sintering the unsaturated titanium hydride powder to obtain the titanium or titanium alloy product. According to the preparation method, the brittleness of the material after partial hydrogen absorption is combined with a low-temperature crushing technology to crush the material into powder, and the powder is directly subjected to isostatic cool pressing and vacuum sintering densification to prepare the titanium and titanium alloy material, so that a dehydrogenation process is omitted, the powder titanium alloy product is prepared in a short process, the yield is high, the cost is low, and the product performance is excellent.
Description
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 high-purity hydrogen is introduced, hydrogen absorption is started, and the hydrogen absorption amount is controlled to be1.0-2.5 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 to10-3～10-1Pa, 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 (10)
1. A short-process preparation method of a powder metallurgy titanium or titanium alloy product is characterized by comprising 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.
2. The short-run method for preparing a powder metallurgy titanium or titanium alloy product according to claim 1, wherein in step S2, the hydrotreating process comprises:
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.
3. The short-process preparation method of powder metallurgy titanium or titanium alloy products according to claim 2, wherein in step S2-2, the hydrogen absorption amount is controlled to be 1.0 to 2.5 wt.%.
4. The short-process preparation method of the powder metallurgy titanium or titanium alloy product according to claim 2, wherein in step S2-3, the hydrogen homogenization treatment is specifically: after the hydrogen introduction is stopped, the temperature is raised to 550-850 ℃ again, and the temperature is kept for 2-5 h.
5. The short-process preparation method of powder metallurgy titanium or titanium alloy products according to claim 1, wherein in step S3, the low-temperature crushing treatment adopts a low-temperature mechanical crushing process, wherein the low-temperature medium is liquid argon.
6. The short-process preparation method of 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.
7. The short-process preparation method of a powder metallurgy titanium or titanium alloy product according to claim 1, wherein in step S4, the forming treatment is a cold isostatic pressing process, wherein the pressing pressure is 150-200 MPa, and the dwell time is 10-30S.
8. The short-process preparation method of powder metallurgy titanium or titanium alloy products according to claim 7, wherein in step S4, the sintering treatment is specifically: and carrying out vacuum sintering densification on the blank obtained by the cold isostatic pressing forming process by adopting a sectional sintering process.
9. The short-process preparation method of a powder metallurgy titanium or titanium alloy product according to claim 8, wherein the step sintering process specifically comprises:
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.
10. The powder metallurgy titanium or titanium alloy product prepared by the short-process preparation method of the powder metallurgy titanium or titanium alloy product according to any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114293047A (en) * | 2021-12-06 | 2022-04-08 | 北京科技大学 | Preparation method of ultrahigh-strength powder metallurgy titanium alloy |
| CN114672682A (en) * | 2022-02-23 | 2022-06-28 | 北京科技大学 | High-performance powder metallurgy titanium alloy part and preparation method thereof |
| CN115502399A (en) * | 2022-09-27 | 2022-12-23 | 哈尔滨工业大学 | Method for preparing titanium-based composite material by low-temperature hot isostatic pressing and titanium-based composite material prepared by method |
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| CN115502399A (en) * | 2022-09-27 | 2022-12-23 | 哈尔滨工业大学 | Method for preparing titanium-based composite material by low-temperature hot isostatic pressing and titanium-based composite material prepared by method |
| CN115502399B (en) * | 2022-09-27 | 2024-03-12 | 哈尔滨工业大学 | Titanium-based composite material prepared by low-temperature hot isostatic pressing and method thereof |
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