CN110560692A - Porous Ti-Al-based alloy material, preparation method and application thereof - Google Patents
Porous Ti-Al-based alloy material, preparation method and application thereof Download PDFInfo
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- CN110560692A CN110560692A CN201910956230.8A CN201910956230A CN110560692A CN 110560692 A CN110560692 A CN 110560692A CN 201910956230 A CN201910956230 A CN 201910956230A CN 110560692 A CN110560692 A CN 110560692A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/022—Metals or alloys
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/146—Porous materials, e.g. foams or sponges
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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
- 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
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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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
- B22F3/11—Making porous workpieces or articles
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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
- B22F3/22—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
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- 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
Abstract
The invention discloses a porous Ti-Al-based alloy material, a preparation method and application thereof. In the preparation process of the porous material, a pore-forming agent is not added, but Al is diffused in Ti to obtain a material with high porosity by utilizing the difference of diffusion coefficients between Al and Ti. The porous Ti-Al-based alloy material prepared by the method is near-net-shaped, the interior of pores is clean and environment-friendly, and the porous Ti-Al-based alloy material can be used as an implant material to be applied to the fields of medical implantation and the like.
Description
Technical Field
The invention relates to the technical field of material preparation, in particular to a porous Ti-Al-based alloy material, a preparation method and application thereof.
Background
The porous titanium and the titanium alloy have the excellent characteristics of high specific strength of porous materials, light weight and good energy absorption, have the advantages of corrosion resistance and good biocompatibility of the titanium and the titanium alloy, and are widely applied to the fields of biomedical implant materials, filtering materials, sound absorption materials and the like.
At present, the methods for preparing porous titanium and titanium alloy at home and abroad include a powder sintering method, a slurry foaming method, a discharge plasma sintering method, a self-propagating high-temperature synthesis method, an additive manufacturing method and the like. However, these methods have difficulty in achieving the production of products having complicated shapes. Near-net shape formation cannot be achieved, thereby limiting the range of applications.
Metal powder injection molding (MIM) is a new type of powder metallurgy near-net-shape molding technology that is the fastest growing and most potential to be applied in international material molding field today, and is a product of combining traditional powder metallurgy molding and plastic injection molding. The technology has the greatest characteristic that parts with final shapes can be directly manufactured, the machining amount is reduced to the maximum extent, raw materials are saved, and the problem that products with complex shapes are difficult to form, which always troubles the field of powder metallurgy, is solved for many years. The porous titanium and the titanium alloy are prepared by adopting the MIM technology, and the near-net forming of products with complex shapes can be realized. The conventional method is to add pore-forming agent into the binder, and the pore-forming agent is removed during sintering to form pores. However, when the sintering temperature is high, the porosity is small. At low sintering temperatures, the powder is not yet fully metallurgically bonded, and the strength is low. And when the porous material is applied to a biomedical implant material, the residual pore-forming agent in the micropores can cause harm to a human body.
In view of this, the invention is particularly proposed.
disclosure of Invention
the invention aims to overcome the defects in the prior art and provide a porous Ti-Al-based alloy material, a preparation method and application thereof.
The invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a method for preparing a porous Ti — Al-based alloy material, including: the porous Ti-Al-based alloy material is prepared by taking Ti powder and Al powder as raw materials and adopting a metal powder injection molding technology.
At present, when preparing porous titanium and titanium alloy, the conventional method is to add pore-forming agent into the binder, and the pore-forming agent is removed during sintering to form pores. However, when the porous material is applied to biomedical implant materials, the residual pore-forming agent in the micropores can cause harm to human bodies.
in order to eliminate the harm caused by the pore-forming agent residue, the embodiment of the invention adopts a near-net forming method to prepare the porous Ti-Al-based alloy material, and the near-net forming method adopts an MIM technology. The MIM technology is that metal powder and organic binder are uniformly mixed and granulated to obtain alloy feed; the alloy feed is injected into a die cavity by an injection molding machine in a heating and plasticizing state for solidification and molding, then a binder in a molded blank is removed by a chemical or thermal decomposition method, and finally the product is obtained by sintering and densification. The porous titanium and the titanium alloy are prepared by adopting the MIM technology, and the near-net forming of products with complex shapes can be realized.
Therefore, the embodiment of the invention provides a near-net-shape preparation method of a porous Ti-Al-based alloy material, the porous Ti-Al-based alloy material is prepared by adopting an MIM technology, and pore-forming agents are not added in the preparation process of the MIM technology, but the pores are formed by utilizing the Cokendall effect of metal powder. That is, during sintering, there is a difference in diffusion coefficient between different metal powders, such that one powder diffuses rapidly into another to form pores, a phenomenon that often hinders densification of the structural material.
Specifically, in the preparation process of the embodiment of the invention, Ti powder and Al powder are used as raw materials, and Al is diffused in Ti to obtain a material with high porosity by utilizing the difference of diffusion coefficients between Al and Ti. The method adopted in the embodiment of the invention can prepare the porous material with high porosity without adopting pore-forming agent, the inside of the pore is clean and environment-friendly, and the problems of residual hazard caused by removal of the pore-forming agent and insufficient removal do not exist.
In an alternative embodiment, the preparation of the porous Ti-Al-based alloy material by the MIM technique comprises the following steps: the raw material and the feed material made of the binder are injected, degreased and sintered.
In an alternative embodiment, the starting powder is a spherical powder with a particle size of 15-30 microns.
The embodiment of the invention provides a preparation method of a porous Ti-Al-based alloy material. The reason why the alloy powder is not used as the raw material is that the alloy powder must be added with a pore-forming agent to obtain the porous material, but the pore-forming agent is difficult to completely remove when being distributed in the alloy, and the residual pore-forming agent can harm human bodies, thereby limiting the application of the alloy material.
In an alternative embodiment, the preparation of the feedstock comprises the following steps: uniformly mixing the raw materials and the binder to obtain a mixed material, and banburying and granulating the mixed material to obtain a feed;
Preferably, the banburying temperature is 140-190 ℃, and the banburying time is 60-70 min;
More preferably, the mixing is carried out under a protective atmosphere of argon or nitrogen, and the protective atmosphere is preferably such that the oxygen content of the mixing environment is less than 1000 ppm.
The embodiment of the invention provides a preparation method of a porous Ti-Al-based alloy material. The banburying is carried out under the protective atmosphere to avoid the oxidation of Ti element in the mixture. Preferably, the banburying is carried out under a protective atmosphere, preferably a nitrogen atmosphere or an argon atmosphere, and more preferably, the protective atmosphere is preferably such that the oxygen content of the banburying environment is less than 1000 ppm.
In an alternative embodiment, the binder is present in the mixture mass in an amount of 40-60% by volume;
preferably, the binder is selected from any one of a wax-based, plastic-based, and water-based binder system;
preferably, the plastic-based binder system consists of, by mass, 84-88: 4-6: 4-6: 1-2 parts of polyformaldehyde, high-density polyethylene, ethylene-vinyl acetate copolymer and stearic acid;
Preferably, the wax-based binder system is prepared by mixing, by mass, 60-70: 30-40: 4-8 of paraffin, polypropylene and stearic acid;
Preferably, the water-based binder system is prepared by mixing 80-90: 10-15: 2-6 of polyethylene glycol, polymethyl methacrylate and stearic acid.
The embodiment of the invention provides a preparation method of a porous Ti-Al-based alloy material, a binder is selected from any one of a wax-based binder system, a plastic-based binder system and a water-based binder system, and high-melting-point and low-melting-point components of the binder system are all composed of multiple components. The shrinkage characteristic collocation of heavy components, the differential distribution of the dissolving speed in an organic solvent and the low-temperature removal are injected on the design of the low-melting-point component; injecting the step distribution of the decomposition temperature of the heavy components and the low residual carbon and oxygen quantities on the design of the high-melting-point components; the stearic acid which is a surfactant is matched, so that a bridging effect is realized between the binder and the powder particles to prevent the two phases from separating, and the uniform feeding mixed material is ensured.
in an alternative embodiment, the injection temperature is 160-170 ℃ and the injection pressure is 20-25MPa during the injection molding process.
In an alternative embodiment, in the degreasing process, the degreasing medium includes, but is not limited to, any one of nitric acid, water, or heptane, and different degreasing media may be selected according to a difference of the binder system, in an embodiment of the present invention, the degreasing medium may be nitric acid, water, or heptane, and the degreasing time may also be adjusted according to a difference of the binders, so as to achieve a purpose of completely removing the binders therein.
in an alternative embodiment, during sintering, sintering is performed in a vacuum environment;
preferably, the vacuum degree of vacuum sintering is less than 10-2pa, sintering temperature of 1200-1300 ℃ and heat preservation time of 2-4 hours.
The embodiment of the invention provides a preparation method of a porous Ti-Al-based alloy material, and the porosity of the porous material can be controlled to be 70-85% by controlling the sintering temperature in the preparation process. This is due to: the sintering environment is controlled to be a vacuum environment, so that the raw materials can be prevented from being oxidized in the reaction process, when the vacuum sintering temperature is lower than 1200 ℃, the powder cannot be fused to form a Ti-Al-based alloy material, and when the vacuum sintering highest temperature exceeds 1300 ℃, Al is rapidly diffused in Ti to form larger pores, so that the mechanical property is rapidly reduced.
in an alternative embodiment, the preparation of the porous Ti-6Al-4V alloy material by using the metal powder injection molding technology comprises the following steps: ti powder, Al powder and V powder; or Ti powder and 6Al-4V alloy powder are taken as raw materials, and the mass ratio of Ti to Al to V in the raw materials is controlled to be 90: 6: 4, uniformly mixing the raw materials with a binder, banburying at 140-190 ℃ for 60-70min under the protective atmosphere of argon or nitrogen, and then granulating to obtain a feed;
Injecting the feed under the conditions of injection temperature of 160-170 ℃ and injection pressure of 20-25MPa for forming to obtain a rough blank;
Degreasing the rough blank in a degreasing medium of nitric acid, water or heptane to obtain a degreased blank;
the degreased blank is processed under the condition that the vacuum degree is less than 10-2Sintering for 2-4 hours at 1200-1300 ℃ in Pa environment to obtain the porous Ti-6Al-4V material.
in an alternative embodiment, the porosity of the porous Ti-6Al-4V alloy material prepared by the metal powder injection molding technology is 70-85%.
The embodiment of the invention provides a porous Ti-6Al-4V material, wherein the porous Ti-6Al-4V material is prepared from pure Ti powder, Al powder and V powder; or pure Ti powder, Al-V alloy powder, the binder can adopt a wax-based, plastic-based or water-based binder system, the MIM technology is adopted, the raw materials and the binder are mixed, banburying, degreasing and vacuum sintering are carried out, the high-porosity porous material is obtained by utilizing the diffusion of aluminum powder in the titanium powder, the porosity is controlled to be 70-85%, the porosity of the material can be ensured, and the porous material has better strength and hardness.
In a second aspect, the embodiment of the invention provides an application of the porous Ti-6Al-4V material as a medical implant material.
the invention has the following beneficial effects:
The invention provides a porous Ti-Al-based alloy material, a preparation method and application thereof. The preparation method is a near-net-shape preparation method, the prepared porous material has controllable pores, is clean and environment-friendly in interior, and can be used as an implant material in the fields of medical implantation and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a metallographic microstructure of a porous Ti-6Al-4V material prepared in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
the following is a brief description of the raw materials involved in the present invention:
Polyoxymethylene: POM with density of 1.39-1.43g/cm3Preferably from Asahi Kasei Kogyo under the brand No. 9520 or FF 520;
Ethylene-vinyl acetate copolymer: EVA with density of 0.91-0.93g/cm3Preferably from mitsui japan under the designation 220;
High density polyethylene: HDPE having a density of 0.94-0.96g/cm3Preferably from Taiwan plastics industry of Chinalimit company, brand 8050;
Stearic acid: SA, the density of SA is 0.92-0.95g/cm3Preferably from the Yi-Hai company under the trade designation 1801;
polyethylene glycol: PEG with a density of 1.11-1.15g/cm3molecular weight of 4000-20000, preferably from the Sanyo corporation of Japan;
Polymethyl methacrylate: PMMA, the density of PMMA is 1.16-1.20g/cm3Preferably from Mitsubishi, Japan, under the trade name LP-3105;
PW: paraffin wax, PW density of 0.88-0.92g/cm3preferably from the German Saxol company under the designation 682;
polypropylene: PP, the density of PP is 0.89-0.91g/cm3Preferably from the Chinese petrochemical company under the designation Z30S.
the following examples are prepared by mixing Ti, Al and V in a mass ratio of 90: 6: 4, preparing a porous alloy material with the composition of Ti-6 Al-4V.
example 1
a near-net-shape forming preparation method of a porous Ti-6Al-4V material adopts an MIM technology. The raw materials are 15-25 microns of spherical Ti powder, Al powder and V powder, and the weight ratio of the three powders is 90: 6: 4. the adhesive adopts a plastic-based adhesive system, the adhesive consists of POM, EVA, HDPE and SA (the mass ratio is 88: 5: 5: 2), and the volume content of the adhesive is 60%.
The near-net-shape preparation method of the porous Ti-6Al-4V material comprises the following specific steps:
1. The weight is calculated according to the volume content ratio of the powder and the binding agent, and the mixture is mixed for 5 hours in a V-shaped mixer.
2. Banburying in a vacuum banbury mixer at 190 deg.C for 70 min. The powder and the binder are mixed evenly to prepare the feed.
3. And (3) performing injection molding on the feed in a powder injection molding machine to obtain a product rough blank, wherein the injection temperature is 170 ℃, and the injection pressure is 25 MPa.
4. And (3) carrying out catalytic degreasing on the product rough blank, wherein the degreasing medium is nitric acid, the degreasing temperature is 120 ℃, and the degreasing time is 7 hours.
5. Performing thermal degreasing and vacuum sintering in a vacuum sintering furnace with the sintering vacuum degree less than 10-2Pa, the highest sintering temperature is 1250 ℃, and the heat preservation time is 3 h.
And (3) testing results: the metallographic microstructure of the sintered product is shown in figure 1, and the black parts in the figure are the gaps on the Ti-6Al-4V material.
The density of the sintered finished product is 3.65g/cm3The porosity of the product obtained was 81%. The tensile strength was 450MPa and the hardness was 210 HV.
Example 2
A near-net-shape forming preparation method of a porous Ti-6Al-4V material adopts an MIM technology. The raw materials are 15-30 micron spherical Ti powder and 6Al-4V alloy powder, and the weight ratio of the three powders is 90: 10. the adhesive adopts a water-soluble adhesive system, the adhesive consists of PEG, PMMA and SA (the mass ratio is 87: 11: 2), and the volume content of the adhesive is 55%.
The near-net-shape preparation method of the porous Ti-6Al-4V material comprises the following specific steps:
1. The weight is calculated according to the volume content ratio of the powder and the binding agent, and the mixture is mixed for 5 hours in a V-shaped mixer.
2. Banburying in a vacuum banbury mixer at 140 deg.C for 60 min. The powder and the binder are mixed evenly to prepare the feed.
3. and (3) performing injection molding on the feed in a powder injection molding machine to obtain a product rough blank, wherein the injection temperature is 160 ℃, and the injection pressure is 20 MPa.
4. Degreasing the product rough blank, wherein the degreasing medium is deionized water, the temperature is 60 ℃, and the degreasing time is 6 h.
5. Performing thermal degreasing and vacuum sintering in a vacuum sintering furnace with the sintering vacuum degree less than 10-2Pa, the highest sintering temperature is 1300 ℃, and the heat preservation time is 4 hours.
and (3) testing results: the density of the sintered finished product is 3.78g/cm3The porosity of the product obtained is 84%. The tensile strength was 470MPa and the hardness was 220 HV.
Example 3
A near-net-shape forming preparation method of a porous Ti-6Al-4V material adopts an MIM technology. The raw materials are 15-30 micron spherical Ti powder, Al powder and V powder, the weight ratio of the three powders is 90: 6: 4. the binder adopts a wax-based binder system, the binder consists of PW, PP and SA (the mass ratio is 65: 30: 5), and the volume content of the binder is 50%.
The near-net-shape preparation method of the porous Ti-6Al-4V material comprises the following specific steps:
1. The weight is calculated according to the volume content ratio of the powder and the binding agent, and the mixture is mixed for 6 hours in a V-shaped mixer.
2. and banburying in a vacuum banbury mixer at 160 ℃ for 60 min. The powder and the binder are mixed evenly to prepare the feed.
3. and (3) performing injection molding on the feed in a powder injection molding machine to obtain a product rough blank, wherein the injection temperature is 170 ℃, and the injection pressure is 25 MPa.
4. And (3) degreasing the product rough blank by using a solvent, wherein the degreasing medium is heptane, the temperature is 30 ℃, and the degreasing time is 30 h.
5. Performing thermal degreasing and vacuum sintering in a vacuum sintering furnace with the sintering vacuum degree less than 10-2Pa, the maximum sintering temperature is 1200 ℃, and the heat preservation time is 4 h.
And (3) testing results: the density of the sintered finished product is 3.38g/cm3The porosity of the obtained product is 75%. The tensile strength was 420MPa and the hardness was 200 HV.
Comparative example
A method for preparing a porous Ti-6Al-4V material, the same as in example 1, except that: the porous Ti-6Al-4V material prepared by the method has low porosity when the sintering temperature is high by taking Ti-6Al-4V prealloyed powder as a raw material and adding a pore-forming agent PMMA. At low sintering temperatures, the powder is not yet fully metallurgically bonded, and the strength is low. And pore-forming agents are remained in pores, so that the method is not suitable for application in the field of medical implantation.
A near-net-shape forming preparation method of a porous Ti-6Al-4V material adopts an MIM technology. The used raw materials are 15-25 micron spherical Ti-6Al-4V powder, the pore-forming agent is PMMA, and the volume ratio of the pore-forming agent to the spherical Ti-6Al-4V powder is 1: 1. the adhesive adopts a plastic-based adhesive system, the adhesive consists of POM, EVA, HDPE and SA (the mass ratio is 88: 5: 5: 2), and the volume content of the adhesive is 60%.
the near-net-shape preparation method of the porous Ti-6Al-4V material comprises the following specific steps:
1. The weight is calculated according to the volume content proportion of the powder, the pore-forming agent and the binder, and the materials are mixed for 5 hours in a V-shaped mixer.
2. banburying in a vacuum banbury mixer at 190 deg.C for 70 min. The powder and the binder are mixed evenly to prepare the feed.
3. And (3) performing injection molding on the feed in a powder injection molding machine to obtain a product rough blank, wherein the injection temperature is 170 ℃, and the injection pressure is 25 MPa.
4. And (3) carrying out catalytic degreasing on the product rough blank, wherein the degreasing medium is nitric acid, the degreasing temperature is 120 ℃, and the degreasing time is 7 hours.
5. Performing thermal degreasing and vacuum sintering in a vacuum sintering furnace with the sintering vacuum degree less than 10-2Pa, the highest sintering temperature is 1250 ℃, and the heat preservation time is 3 h.
The density of the sintered finished product is 4.05g/cm3The porosity of the obtained product is 90%. The tensile strength was 680MPa and the hardness was 324 HV.
To sum up, the embodiment of the invention discloses a porous Ti-Al-based alloy material, a preparation method and application thereof, wherein the preparation method comprises the following steps: the porous Ti-Al-based alloy material is prepared by taking Ti powder and Al powder as raw materials and adopting a metal powder injection molding technology. The preparation process of the porous material utilizes the difference of diffusion coefficients between Al and Ti, and Al diffuses in Ti to obtain the material with high porosity. Therefore, the porous Ti-Al-based alloy material is prepared by near-net-shape forming, has clean and environment-friendly pores, and can be applied to the fields of medical implantation and the like.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a porous Ti-Al-based alloy material is characterized by comprising the following steps: the porous Ti-Al-based alloy material is prepared by taking Ti powder and Al powder as raw materials and adopting a metal powder injection molding technology.
2. the preparation method according to claim 1, wherein the step of preparing the porous Ti-Al based alloy material by using a metal powder injection molding technology comprises the following steps: the raw material and the feed material made of the binder are injected, degreased and sintered.
3. The method according to claim 2, wherein the raw material is a powder, preferably a spherical powder having a particle size of 15 to 30 μm.
4. The method according to claim 2, wherein the injection temperature is 160 to 170 ℃ and the injection pressure is 20 to 25MPa during the injection molding.
5. the production method according to claim 2, wherein the sintering is performed in a vacuum environment;
Preferably, the vacuum degree of vacuum sintering is less than 10－2Pa, sintering temperature of 1200-1300 ℃ and time of 2-4 hours.
6. The method of claim 2 wherein the feedstock is prepared by the steps of: uniformly mixing the raw materials with a binder to obtain a mixed material, and banburying and granulating the mixed material to obtain a feed;
Preferably, the banburying temperature is 140-190 ℃, and the banburying time is 60-70 min;
More preferably, the banburying is carried out under a protective atmosphere of argon or nitrogen, and the protective atmosphere is preferably such that the oxygen content of the banburying environment is less than 1000 ppm.
7. The preparation method of claim 6, wherein the volume ratio of the binder in the mixed material is 40-60%;
Preferably, the binder is selected from any one of a wax-based, plastic-based, and water-based binder system;
More preferably, the plastic-based binder system is prepared by mixing 84-88: 4-6: 4-6: 1-2 parts of polyformaldehyde, high-density polyethylene, ethylene-vinyl acetate copolymer and stearic acid;
more preferably, the wax-based binder system is prepared from a wax-based binder system consisting of, by mass, 60-70: 30-40: 4-8 of paraffin, polypropylene and stearic acid;
more preferably, the water-based binder system is prepared from a mixture of 80-90: 10-15: 2-6 of polyethylene glycol, polymethyl methacrylate and stearic acid.
8. The preparation method of claim 2, wherein the step of preparing the porous Ti-6Al-4V alloy material by using a metal powder injection molding technology comprises the following steps:
Ti powder, Al powder and V powder; or Ti powder and 6Al-4V alloy powder are taken as raw materials, and the mass ratio of Ti to Al to V in the raw materials is controlled to be 90: 6: 4, uniformly mixing the mixture with a binder, banburying the mixture for 60-70min at 140-190 ℃ in the protective atmosphere of argon or nitrogen, and then granulating to obtain a feed;
Injecting and forming the feed under the conditions that the injection temperature is 160-170 ℃ and the injection pressure is 20-25MPa to obtain a rough blank;
Degreasing the rough blank in a degreasing medium of nitric acid, water or heptane to obtain a degreased blank;
The degreased blank is processed under the condition that the vacuum degree is less than 10－2Sintering for 2-4 hours at 1200-1300 ℃ in Pa environment to obtain the porous Ti-6Al-4V material.
9. The method according to claim 8, wherein the porosity of the porous Ti-6Al-4V alloy material is 70% to 85%.
10. Use of the porous Ti-6Al-4V alloy material prepared according to the preparation method described in claim 8 or 9 as a medical implant material.
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Cited By (2)
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