CN112264622B - TiH-based 2 Method for preparing porous Ti-Ni alloy by powder - Google Patents
TiH-based 2 Method for preparing porous Ti-Ni alloy by powder Download PDFInfo
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Abstract
The invention discloses a TiH-based material 2 A method for preparing porous Ti-Ni alloy by powder belongs to the technical field of preparation of titanium-nickel porous alloy. The invention is realized by combining TiH 2 Powder, nickel powder, pore-forming agent NH 4 CO 3 Mixing and ball milling the powder, then carrying out compression molding, carrying out vacuum sintering to obtain a titanium-nickel alloy matrix, and depositing TiO on the surface of the porous titanium-nickel alloy by adopting a sol-gel method 2 ‑SiO 2 A film. The porous Ti-Ni alloy prepared by the method has unique volume memory effect which is not possessed by compact Ti-Ni alloy, can absorb kinetic energy after being implanted into human body, reduces vibration impact, and the porous structure provides space for bone tissue to grow in, and the TiO 2 ‑SiO 2 The film can improve the corrosion resistance and biocompatibility of the porous titanium-nickel alloy matrix and reduce the Ni content in the titanium-nickel alloy + The toxic action on human tissues caused by excessive precipitation can also obviously promote the wall-hanging growth of bone tissues.
Description
Technical Field
The invention relates to a method for preparing a porous Ti-Ni alloy based on TiH2 powder, belonging to the technical field of preparing a low-cost high-performance titanium-nickel alloy by a powder metallurgy method.
Background
In recent years, the porous titanium-nickel alloy has been used as a hot spot of medical research, and the porous titanium-nickel alloy has good osteogenesis capability, shape memory property, elastic modulus similar to natural bone and good biocompatibility, so that the medical advantage of the porous titanium-nickel alloy is determined. However, there are many urgent problems in the aspects of repairing and replacing bone tissue of medical use, and the mechanical properties of the porous titanium-nickel alloy are almost linearly reduced along with the increase of porosity, and the porous titanium-nickel alloy has the defects of non-uniformity of tissue and non-continuity of matrix tissue, sensitivity to impurity phases and Ni + The problems of excessive precipitation and toxic action on tissues and the like are caused, and after the artificial hip joint is implanted, the artificial teeth are implanted and the human spinal joint is replaced, the bonding strength is insufficient, the implanted material can loose in the human body, and the implanted material needs to be treated or replaced by an operation sometimes after a period of implantation, so that the pain brought to a patient by a secondary operation is increased.
Disclosure of Invention
The invention aims to provide a TiH-based material 2 Method for preparing porous Ti-Ni alloy by powder and depositing TiO on Ti-Ni alloy surface 2 -SiO 2 The method of the invention can not only effectively control the porosity and the pore size of the titanium-nickel alloy, but also effectively improve the mechanical property, the corrosion resistance and the biocompatibility of the porous titanium-nickel alloy.
The method for preparing the titanium-nickel alloy disclosed by the invention comprises the following specific preparation steps of:
(1) TiH is processed by 2 Powder, nickel powder, NH 4 CO 3 Mixing the powder uniformly in proportion, ball-milling the mixed powder by a planetary high-energy ball mill, and pressing and forming to obtain the Ti-Ni green compact.
(2) And (3) placing the molded sample prepared in the step (1) in a vacuum sintering furnace, sintering under a high vacuum condition, and cooling to obtain the porous titanium-nickel alloy.
(3) Absolute ethanol, tetra-n-butyl titanate (Ti (OC) 4 H 2 ) Water, acetylacetone (C) 5 H 8 O 2 ) Preparation of TiO with concentrated nitric acid 2 Sol, then to TiO 2 The gel was added with ethyl orthosilicate (Si (OC) 2 H 5 ) 4 ) And ammonia water to prepare TiO 2 -SiO 2 And (5) gel.
(4) Washing and drying the porous titanium-nickel alloy sample prepared in the step (2), and immersing the sample into TiO 2 -SiO 2 Slowly taking out the gel after 2-5 min, and depositing a layer of TiO on the porous titanium-nickel alloy 2 -SiO 2 And (3) coating.
(5) Depositing TiO on the surface in the step (4) 2 -SiO 2 Performing high-temperature aging treatment on the porous titanium-nickel alloy to obtain the titanium-nickel alloy with TiO on the surface 2 -SiO 2 Porous titanium-nickel alloy of the coating.
Preferably, the TiH of the present invention 2 Particle size of the powder and the nickel powder<45um、NH 4 CO 3 The powder contains not more than 0.2% of impurity components.
Preferably, the ball-material ratio in the ball milling process is 3:1, the ball milling rotating speed is set to be 200r/min, the ball milling time in the first stage is 10min, the time is 5min after cooling, and the rotating speed is set to be 50r/min for 2h.
Preferably, in the step (1) of the invention, a powder tablet press (cylindrical die) is used for carrying out room-temperature prepressing molding, the pressing pressure is 4-8 MPa, and the pressure maintaining time is 10min, so that a cylindrical green body is obtained.
Preferably, the vacuum sintering conditions in step (2) of the present invention are: sintering temperature 1050-1200 deg.c and sintering time 120-180 minIn the heating process, a plurality of heat preservation platforms are arranged at 200 ℃, 500 ℃, 600 ℃ and 700 ℃ and each heat preservation platform is used for preserving heat for 30 to 60 minutes, and the vacuum degree in the sintering process is more than 10 -3 Pa, thereby ensuring NH 4 CO 3 Decomposition and TiH 2 The powder is completely dehydrogenated.
The TiO of the invention 2 -SiO 2 The preparation method of the gel is a conventional method, and comprises the following specific processes: with tetra-n-butyl titanate (Ti (OC) 4 H 2 ) Absolute ethyl alcohol, acetylacetone (C) 5 H 8 O 2 ) And ethyl orthosilicate (Si (OC) 2 H 5 ) 4 ) As a main raw material, absolute ethyl alcohol: tetra-n-butyl titanate (Ti (OC) 4 H 2 )): acetylacetone (C) 5 H 8 O 2 ): water (H) 2 O) Ethyl orthosilicate (Si (OC) 2 H 5 ) 4 ) According to the volume ratio of 10:5:1:10:1, taking 20-22 ml of absolute ethyl alcohol quantitatively, slowly stirring in a beaker, slowly adding 10-11 ml of tetra-n-butyl titanate, stirring, adding about 2ml of acetylacetone and a proper amount of concentrated nitric acid to adjust the PH to be about 3-4, fully stirring, adding 20-22 ml of water at a very slow speed, stirring to obtain a yellowish transparent solution of the solution, and sealing and standing to obtain the newly prepared TiO 2 Sol; to freshly prepared TiO 2 Adding 2-3 ml of ethyl orthosilicate into the sol, stirring for about 1h, then slowly dripping ammonia water to adjust the PH to 7-7.5, stirring and standing to obtain the required TiO 2 -SiO 2 And (5) gel.
Preferably, in the step (4), the lifting speed is 10-15 cm/min, and the lifting is repeated for 10-15 times.
Preferably, the long-time high-temperature aging heat treatment conditions in the step (5) of the invention are as follows: heating to 100-120 ℃ at a heating rate of 1-1.5 ℃/min, preserving heat for 15-20 min to prevent the coating from cracking, heating to 450-500 ℃ at a heating rate of 5 ℃/min, preserving heat for 1h to ensure firm bonding between the coating and the surface of the porous titanium-nickel alloy, heating to 800-900 ℃ at a heating rate of 10 ℃/min, preserving heat for 4h, transforming the porous titanium-nickel alloy structure, reducing the content of impurity phases, and cooling to room temperature along with a furnace.
The principle of the invention is as follows: the invention adopts hydrogenationTitanium and nickel powder as raw materials, NH 4 CO 3 Preparing porous titanium-nickel alloy for pore-forming agent, and depositing a layer of TiO on the surface 2 -SiO 2 The coating adopts TiH as the front-end raw material 2 The cost is reduced, and meanwhile, the obtained alloy material has good mechanical property, corrosion resistance and biocompatibility; by utilizing the reversible alloying action of hydrogen in the titanium alloy, the microstructure and performance of the porous titanium alloy can be improved, and the titanium hydride and the pore-forming agent NH are used in the vacuum sintering process 4 CO 3 The density of the compact is reduced by dehydrogenation, thereby achieving the purpose of effectively controlling the porosity, pore shape and distribution characteristics. The porous titanium-nickel alloy can promote the 'in-growth' of human bone tissue, and is beneficial to the reconstruction of implanted artificial bone and natural bone tissue and the biological integration and homogenization process; tiO is deposited on the surface of the porous titanium-nickel alloy by adopting a sol-gel method 2 -SiO 2 The film further improves the corrosion resistance of the porous titanium-nickel alloy matrix, promotes the cell wall growth in the pores of the porous titanium-nickel alloy, has excellent biocompatibility, has excellent binding capacity with the porous titanium-nickel alloy matrix, can deposit the film on the surface of the porous titanium-nickel alloy with complex shape, can strictly control the shape and thickness, has less influence on the porosity of the porous titanium-nickel alloy, and the like, and can also prepare TiO on the surface of the porous titanium-nickel alloy by subsequent high-temperature aging heat treatment 2 -SiO 2 The film is dried and sintered, the independent sintering step is reduced, the bonding capability with the porous titanium-nickel alloy is improved, the structural non-uniformity and the matrix structure non-continuity of the porous titanium-nickel alloy can be effectively reduced, the impurity phase content is greatly reduced, and the porous titanium-nickel alloy and TiO after aging heat treatment are prepared 2 -SiO 2 The bonding strength of the film is obviously improved, and the film has a larger friction coefficient, thereby strengthening the anchoring of the material and bone tissues at early stage, and also has a unique volume memory effect which is not possessed by compact titanium-nickel alloy, and can play a role in absorbing kinetic energy and reducing vibration impact after being implanted into a human body.
The invention has the beneficial effects that:
(1) The invention uses TiH by using the powder metallurgy method 2 Taking powder and Ni powder as raw materials, taking NH 4 CO 3 Preparing porous titanium-nickel alloy for a pore-forming agent; in the vacuum sintering process, tiH is continuously increased along with the temperature 2 The continuous dehydrogenation at high temperature has a cleaning effect on the surface of the sample, so that the clean low-cost porous titanium-nickel alloy can be obtained, the introduction of other impurities is avoided, and the performance of the porous titanium-nickel alloy is further improved.
(2) The invention can control TiH 2 Particle diameters of the powder and Ni powder, and NH was adjusted 4 CO 3 The content changes the pressure in the pressing process and is matched with a certain sintering temperature, so that the porosity and the pore diameter of the porous titanium-nickel alloy are further improved.
(3) The invention prepares TiO by chemical method 2 -SiO 2 The gel has simple method, can greatly improve the bonding strength between the matrix and the coating, can effectively control the thickness and the form of a deposited film on the surface of a complex porous titanium-nickel alloy sample, has small influence on the porosity and the pore form of the porous titanium-nickel alloy, and deposits the obtained TiO 2 -SiO 2 The film is compact, has good film base binding capacity, can passivate the surface of the porous titanium-nickel alloy, raise corrosion potential, promote the corrosion resistance of the porous titanium-nickel alloy and realize TiO 2 -SiO 2 The film has similar performance to bone tissue, and the compact film can reduce Ni in Ti-Ni alloy + The toxic action on human tissues caused by excessive precipitation is better in biocompatibility, and the wall-hanging growth of bone tissues is promoted.
(4) The subsequent high-temperature aging heat treatment can effectively reduce the sintering of TiO 2 -SiO 2 The single step of coating can also reduce the structural non-uniformity and the matrix structure discontinuity of the porous titanium-nickel alloy, and greatly reduce the content of impurity phases.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described in connection with the accompanying drawings and the specific embodiments, but the scope of the invention is not limited to the description.
Example 1
TiH-based 2 Preparing porous Ti-Ni alloy by powder and depositing TiO on surface 2 -SiO 2 The coating method specifically comprises the following steps:
(1) NH Using mortar 4 HCO 3 Grinding the particles for 10min, and sieving with a 80-mesh sieve to obtain NH with uniform particles 4 HCO 3 And (5) powder.
(2) Weighing a certain amount of TiH according to the composition ratio of the alloy 2 Powder, nickel powder and treated NH 4 CO 3 Placing the powder into a planetary ball mill, ball milling in air, and TiH 2 The mass ratio of the powder to the nickel powder is 1:1, NH 4 CO 3 The powder quality is TiH 2 10% of powder mass, unidirectional rotation, 41% of loading volume, 3:1 of ball-material ratio, 400 meshes of raw material powder, 200r/min of ball milling rotation speed, 10min of ball milling time in the first stage, 5min of cooling after the time, 50r/min of rotation speed and 2h of time, full mixing, and sealing and preserving in a self-sealing bag.
(3) Weighing 3g of the ball-milled mixed powder, placing the powder into a die cavity, manually pressurizing the powder to a pressure of 8MPa by a tablet press, maintaining the pressure for 10min, and demolding to prepare a cylindrical pressed compact with the diameter of about 16 mm.
(4) Placing the pressed compact into a vacuum sintering furnace, setting a basic heating rate of 10 ℃/min, respectively setting heat preservation platforms at 200 ℃, 500 ℃, 600 ℃ and 700 ℃, preserving heat for 45 minutes on each platform, finally sintering at 1100 ℃ for 120 minutes, and cooling along with the furnace to obtain a porous titanium-nickel alloy sample.
(5) Slowly stirring 20ml of absolute ethyl alcohol in a beaker, slowly adding 10ml of tetrabutyl titanate, stirring, adding 2ml of acetylacetone and a proper amount of concentrated nitric acid to adjust the PH to be about 3, fully stirring, adding 20ml of water at a very slow speed, stirring to obtain a yellowish transparent solution, and sealing and standing to obtain the final productNew prepared TiO 2 Sol; to freshly prepared TiO 2 Adding about 2ml of ethyl orthosilicate into the sol, stirring for about 1h, slowly dripping ammonia water to adjust the PH to 7, stirring and standing to obtain the required TiO 2 -SiO 2 And (5) gel.
(6) Cleaning the sintered porous titanium-nickel alloy sample, drying and placing into the prepared TiO 2 -SiO 2 Surface deposition is carried out in the gel, the gel is taken out slowly after about 4min, the pulling speed is 12cm & min, and the pulling is repeated for 10 times, thereby depositing a layer of TiO on the porous titanium-nickel alloy 2 -SiO 2 And (3) coating.
(7) Carrying out high-temperature aging heat treatment on the porous titanium-nickel alloy sample with the deposited surface, wherein the heat treatment process comprises the following steps: heating to 100 ℃ at a heating rate of 1-1.5 ℃/min for 15min, preventing the coating from cracking, heating to 450 ℃ at a heating rate of 5 ℃/min for 1h, ensuring that the coating and the surface of the porous titanium-nickel alloy are firmly combined, heating to 850 ℃ at a heating rate of 10 ℃/min, and preserving the heat for 4h, wherein the porous titanium-nickel alloy structure is transformed, the content of impurity phases is reduced, and then cooling to room temperature along with a furnace.
(8) Taking out the sample, respectively ultrasonically cleaning the sample for three times by using deionized water and alcohol, and drying the sample in a drying oven at 60 ℃ for 24 hours to obtain the porous titanium-nickel alloy, wherein the porosity of the porous titanium-nickel alloy is 25.7%.
Example 2
Nickel powder and NH (NH) are added based on titanium hydride powder 4 CO 3 Preparation of porous titanium-nickel alloy by powder and surface deposition of TiO 2 -SiO 2 The coating method specifically comprises the following steps:
(1) NH Using mortar 4 HCO 3 Grinding the particles for 10min, and sieving with a 80-mesh sieve to obtain NH with uniform particles 4 HCO 3 And (5) powder.
(2) Weighing a certain amount of TiH according to the composition ratio of the alloy 2 Powder, nickel powder and treated NH 4 CO 3 Placing the powder into a planetary ball mill, ball milling in air, and TiH 2 The mass ratio of the powder to the nickel powder is 4:3, NH 4 CO 3 The powder quality is TiH 2 20% of the powder mass, unidirectional rotation, loadingThe material volume is 41%, the ball-material ratio is 3:1, the raw material powder is-400 meshes, the ball milling rotating speed is set to be 200r/min, the ball milling time in the first stage is 10min, the time is cooled for 5min after the ball milling time is up, the rotating speed is set to be 50r/min, the time is 2h, the raw material powder is fully mixed, and the raw material powder is filled into a self-sealing bag for sealing and preservation.
(3) Weighing 3g of the ball-milled mixed powder, placing the powder into a die cavity, manually pressurizing the powder to a pressure of 6MPa by a tablet press, maintaining the pressure for 10min, and demolding to prepare a cylindrical pressed compact with the diameter of about 16 mm.
(4) Placing the pressed compact into a vacuum sintering furnace, setting basic heating rate to be 10 ℃/min, respectively setting heat preservation platforms at 200 ℃, 500 ℃, 600 ℃ and 700 ℃, preserving heat for 45 minutes on each platform, finally sintering at 1150 ℃ for 90 minutes, and then cooling along with the furnace.
(5) Slowly stirring 20ml of absolute ethyl alcohol in a beaker, slowly adding 10ml of tetrabutyl titanate, stirring, adding 2ml of acetylacetone and a proper amount of concentrated nitric acid to adjust the PH to be about 3, fully stirring, adding 20ml of water at a very slow speed, stirring to obtain a yellowish transparent solution, and sealing and standing to obtain the newly prepared TiO 2 Sol; to freshly prepared TiO 2 Adding about 2ml of ethyl orthosilicate into the sol, stirring for about 1h, slowly dripping ammonia water to adjust the PH to 7, stirring and standing to obtain the required TiO 2 -SiO 2 And (5) gel.
(6) Cleaning a porous titanium-nickel alloy sample prepared by sintering, drying and placing the sample into the prepared TiO 2 -SiO 2 Taking out the gel after about 3min, repeating the pulling for 10 times at a pulling speed of 10cm/min, thereby depositing a layer of TiO on the porous titanium-nickel alloy 2 -SiO 2 And (3) coating.
(7) Carrying out high-temperature aging heat treatment on the porous titanium-nickel alloy sample with the deposited surface, wherein the heat treatment process comprises the following steps: heating to 100deg.C at a heating rate of 1.5deg.C/min for 15min, heating to 500deg.C at 5deg.C/min for 1 hr, heating to 850deg.C at 10deg.C/min for 4 hr, and cooling to room temperature with furnace.
(8) Taking out the sample, respectively ultrasonically cleaning the sample for three times by using deionized water and alcohol, and drying the sample in a drying oven at 60 ℃ for 24 hours to obtain the porous titanium-nickel alloy, wherein the porosity of the porous titanium-nickel alloy is 31.982%.
Example 3
Nickel powder and NH (NH) are added based on titanium hydride powder 4 CO 3 Preparation of porous titanium-nickel alloy by powder and surface deposition of TiO 2 -SiO 2 The coating method specifically comprises the following steps:
(1) NH Using mortar 4 HCO 3 Grinding the particles for 10min, and sieving with a 80-mesh sieve to obtain NH with uniform particles 4 HCO 3 And (5) powder.
(2) Weighing a certain amount of TiH according to the composition ratio of the alloy 2 Powder, nickel powder and treated NH 4 CO 3 Placing the powder into a planetary ball mill, ball milling in air, and TiH 2 The mass ratio of the powder to the nickel powder is 1:1, NH 4 CO 3 The powder quality is TiH 2 30% of powder mass, one-way rotation, 41% of loading volume, 3:1 of ball-material ratio, 400 meshes of raw material powder, 200r/min of ball milling rotation speed, 10min of ball milling time in the first stage, 5min of cooling after the time, 50r/min of rotation speed and 2h of time, full mixing, and sealing and preserving in a self-sealing bag.
(3) Weighing 3g of the ball-milled mixed powder, placing the powder into a die cavity, manually pressurizing the powder to a pressure of 8MPa by a tablet press, maintaining the pressure for 10min, and demolding to prepare a cylindrical pressed compact with the diameter of about 16 mm.
(4) Placing the pressed compact into a high-vacuum sintering furnace, setting basic heating rate to be 10 ℃/min, respectively setting heat preservation platforms at 200 ℃, 500 ℃, 600 ℃ and 700 ℃, preserving heat for 45 minutes on each platform, finally sintering at 1200 ℃ for 90 minutes, and then cooling along with the furnace.
(5) Slowly stirring 20ml of absolute ethyl alcohol in a beaker, slowly adding 10ml of tetrabutyl titanate, stirring, adding 2ml of acetylacetone and a proper amount of concentrated nitric acid to adjust the PH to be about 3, fully stirring, adding 20ml of water at a very slow speed, stirring to obtain a yellowish transparent solution, and sealing and standing to obtain the new preparationTiO 2 Sol; to freshly prepared TiO 2 Adding about 2ml of ethyl orthosilicate into the sol, stirring for about 1h, slowly dripping ammonia water to adjust the PH to 7, stirring and standing to obtain the required TiO 2 -SiO 2 And (5) gel.
(6) Placing the sintered porous titanium-nickel alloy sample into the prepared TiO 2 -SiO 2 Surface deposition is carried out in the gel, the gel is slowly taken out after about 2.5min, the pulling speed is 10cm/min, and the pulling is repeated for 12 times, thereby depositing a layer of TiO on the porous titanium-nickel alloy 2 -SiO 2 And (3) coating.
(7) Carrying out high-temperature aging heat treatment on the porous titanium-nickel alloy sample with the deposited surface, wherein the heat treatment process comprises the following steps: heating to 120 ℃ at a heating rate of 1 ℃/min, preserving heat for 15min to prevent the coating from cracking, heating to 500 ℃ at a heating rate of 5 ℃/min, preserving heat for 1h, heating to 800 ℃ at a heating rate of 10 ℃/min, preserving heat for 4h, and cooling to room temperature along with a furnace.
(8) Taking out the sample, respectively ultrasonically cleaning the sample for three times by using deionized water and alcohol, and drying the sample in a drying oven at 60 ℃ for 24 hours to obtain the porous titanium-nickel alloy, wherein the porosity of the porous titanium-nickel alloy is 42.486%.
Claims (7)
1. TiH-based 2 The method for preparing the porous Ti-Ni alloy by the powder is characterized by comprising the following steps of:
(1) TiH is processed by 2 Powder, nickel powder, NH 4 CO 3 Uniformly mixing the powder according to a proportion, ball-milling the mixed powder by a planetary high-energy ball mill, and performing compression molding to obtain a Ti-Ni green body;
(2) Placing the molded sample prepared in the step (1) in a vacuum sintering furnace, sintering under a high vacuum condition, and cooling to obtain a porous titanium-nickel alloy;
(3) Preparing absolute ethyl alcohol, tetrabutyl titanate, water, acetylacetone and concentrated nitric acid to prepare TiO 2 Sol, then to TiO 2 The gel was added with ethyl orthosilicate (Si (OC) 2 H 5 ) 4 ) And ammonia water to prepare TiO 2 -SiO 2 Gel;
(4) Sampling the porous titanium-nickel alloy prepared in the step (2)Immersing the product after washing and drying into TiO 2 -SiO 2 Slowly taking out the gel after 2-5 min, and depositing a layer of TiO on the porous titanium-nickel alloy 2 -SiO 2 A coating;
(5) Depositing TiO on the surface in the step (4) 2 -SiO 2 Performing high-temperature aging treatment on the porous titanium-nickel alloy to obtain the titanium-nickel alloy with TiO on the surface 2 -SiO 2 A porous titanium-nickel alloy of the coating;
the vacuum high-temperature aging treatment conditions in the step (5) are as follows: heating to 100-120 ℃ at a heating rate of 1-1.5 ℃/min, preserving heat for 15-20 min to prevent the coating from cracking, heating to 450-500 ℃ at a heating rate of 5 ℃/min, preserving heat for 1h to ensure firm bonding between the coating and the surface of the porous titanium-nickel alloy, heating to 800-900 ℃ at a heating rate of 10 ℃/min, preserving heat for 4h, transforming the porous titanium-nickel alloy structure, reducing the content of impurity phases, and cooling to room temperature along with a furnace.
2. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: tiH (TiH) 2 Particle size of the powder and the nickel powder<45um、NH 4 CO 3 The particle size of the powder is 80-400 meshes, and the impurity content is not higher than 0.2%.
3. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: setting the ball-material ratio to be 4:1 in the ball milling process, wherein the ball milling speed is 200r/min, and the ball milling time is 2h.
4. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: in the step (1), a powder tablet press is used for carrying out room temperature pre-pressing molding, the pressing pressure is 4-8 MPa, and the pressure maintaining time is 10min.
5. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: the conditions of vacuum sintering in the step (2) are as follows: the sintering temperature is 1050-1200 ℃, the sintering time is 120-180 min, and a plurality of protections are arranged at 200 ℃, 500 ℃, 600 ℃ and 700 ℃ in the heating processThe temperature of each heat preservation platform is kept for 30-60 min, and the vacuum degree in the sintering process is more than 10 -3 Pa。
6. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: in the step (2), the volume ratio of absolute ethyl alcohol, tetra-n-butyl titanate, acetylacetone, water and ethyl orthosilicate is as follows: 10:5:1:10:1.
7. The method for preparing a porous Ti-Ni alloy based on TiH2 powder according to claim 1, characterized in that: in the step (4), the lifting speed is 10-15 cm/min, and the lifting is repeated for 10-15 times.
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