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CN-121976087-A - Biomedical titanium alloy with high strength and low modulus and preparation method thereof

CN121976087ACN 121976087 ACN121976087 ACN 121976087ACN-121976087-A

Abstract

The invention discloses a biomedical titanium alloy with high strength and low modulus and a preparation method thereof, wherein the titanium alloy comprises, by mass, 10% -25% of Zr, 8% -16% of Mo, 1% -4% of Sn, 0.5% -2% of Fe, 0.01% -0.2% of C and the balance of Ti, and the titanium alloy contains precipitated phase titanium carbide. According to the invention, the beta titanium alloy with lower elastic modulus is obtained by optimizing the proportion of zirconium, molybdenum, tin and iron elements, meanwhile, the characteristic that the molybdenum element can reduce the solubility of carbon in a matrix is utilized, and the TiC x precipitation is regulated and controlled by adopting a heat treatment process in combination with ageing strengthening, so that precipitation strengthening is realized, and the strength and hardness of the material are further improved while the plasticity is maintained. Compared with the traditional material, the biomedical titanium alloy prepared by the invention meets the performance requirements of clinical implants in terms of modulus, strength and ductility.

Inventors

  • ZHAO DAPENG
  • Zhang Juanxiao
  • CAI ZONGYUAN
  • TANG LING

Assignees

  • 湖南大学

Dates

Publication Date
20260505
Application Date
20251226

Claims (10)

  1. 1. The biomedical titanium alloy is characterized by comprising, by mass, 10% -25% of Zr, 8% -16% of Mo, 1% -4% of Sn, 0.5% -2% of Fe, 0.01% -0.2% of C and the balance of Ti, wherein the titanium alloy contains precipitated phase titanium carbide.
  2. 2. The biomedical titanium alloy with high strength and low modulus according to claim 1, wherein the titanium alloy comprises, by mass, 10% -20% of Zr, 10% -16% of Mo, 1% -4% of Sn, 0.5% -2% of Fe, 0.08% -0.2% of C and the balance of Ti, wherein the titanium alloy contains precipitated phase titanium carbide.
  3. 3. The biomedical titanium alloy with high strength and low modulus according to claim 1, wherein the mass percentage of Zr and Mo is 1-1.5:1.
  4. 4. A method for preparing the biomedical titanium alloy with high strength and low modulus according to any one of claims 1 to 3, comprising the following steps: s1, weighing all raw material components according to mass percentages, and placing the raw material components in a vacuum smelting furnace; S2, vacuumizing, filling protective gas, and smelting all raw material components to obtain an ingot; S3, homogenizing the cast ingot to obtain a blank; S4, hot rolling the blank to obtain a plate; S5, carrying out solid solution and quenching treatment on the plate to obtain a titanium alloy primary blank; s6, carrying out natural aging strengthening on the titanium alloy primary blank to obtain the target titanium alloy.
  5. 5. The method for preparing a biomedical titanium alloy with high strength and low modulus according to claim 4, wherein in the step S1, graphite powder, titanium sponge, zirconium sponge, tin particles, iron particles and molybdenum particles are placed in the vacuum melting furnace from bottom to top in sequence, and the graphite powder is wrapped with molybdenum foil.
  6. 6. The method for preparing a biomedical titanium alloy with high strength and low modulus according to claim 5, wherein in the step S1, the purity of each raw material component is not lower than 99.95%, and the thickness of the molybdenum foil is 0.03 mm-0.05 mm and the purity is not lower than 99.95%.
  7. 7. The method for preparing the biomedical titanium alloy with high strength and low modulus according to claim 4, wherein in the step S2, the metal component is melted into liquid and wrapped with graphite powder by adopting current 160A-190A, then the alloy liquid is flowed by adopting current 300A-340A to realize primary homogenization of components, each cast ingot is smelted for 6-8 times, and each smelting is performed with one turn.
  8. 8. The method for preparing the biomedical titanium alloy with high strength and low modulus according to claim 4, wherein in the step S3, firstly, the temperature of the cast ingot is raised to 450-550 ℃ at the speed of 8-10 ℃ per min in a vacuum sintering furnace, the heat is preserved for 0.5-1 h, then the temperature is raised to 1000-1300 ℃ at the speed of 3-5 ℃ per min, the heat is preserved for 1-2 h, and finally the cast ingot is cooled to room temperature along with the furnace.
  9. 9. The method for preparing the biomedical titanium alloy with high strength and low modulus according to claim 4, wherein in the step S4, firstly, the blank is subjected to heat preservation at 700-800 ℃ for 0.5-1 h, then is rolled, the single pressing deformation amount during rolling is 5-10%, the inter-pass furnace return heat preservation is carried out for 2-5 min, and the total deformation amount is 20-50%.
  10. 10. The method for preparing the biomedical titanium alloy with high strength and low modulus according to claim 4, wherein in the step S5, the plate is firstly sealed by a quartz tube in vacuum, then is insulated for 2-8 hours at 1000-1300 ℃, and finally the quartz tube is broken in water after the insulation is finished, so that the plate is rapidly cooled to room temperature.

Description

Biomedical titanium alloy with high strength and low modulus and preparation method thereof Technical Field The invention relates to the technical field of medical alloy, in particular to a biomedical titanium alloy with high strength and low modulus and a preparation method thereof. Background Titanium alloys are often used in the field of clinical repair as hard tissue implant materials because of their excellent mechanical strength, corrosion resistance and good biocompatibility. The most widely used titanium alloy Ti-6Al-4V is about 110 Gpa in the elastic modulus, which is far higher than the elastic modulus of 10-30Gpa of human skeleton, so that when the titanium alloy is used as a bone implant, the stress shielding effect is generated due to mismatching of the modulus, and the adjacent bone is absorbed to cause loosening failure of the bone implant. In addition, research shows that elements such as Al, V and the like have potential toxicity, can harm a nervous system and can cause diseases such as Alzheimer disease and the like. In recent years, the pure beta-phase titanium alloy becomes the main research direction of medical implant alloy materials because the elastic modulus is closer to human bones, and the elastic modulus can be further reduced by adding biocompatible elements such as Nb, ta and the like, but meanwhile, the pure beta-phase titanium alloy has the defects of relatively low strength and poor wear resistance, and the added biocompatible elements are expensive and refractory, so that the raw material cost and the processing cost are greatly increased. Currently, there is a lack of titanium alloy formulations in the industry that balance the needs of high strength, low modulus, low cost, etc. Based on the above problems, researchers need to develop a medical titanium alloy having high strength, low modulus, low cost and good biocompatibility to ensure long-term safe service and market competitiveness of bone implants. Disclosure of Invention The invention aims to provide a biomedical titanium alloy with high strength and low modulus, which solves the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: The biomedical titanium alloy comprises, by mass, 10% -25% of Zr, 8% -16% of Mo, 1% -4% of Sn, 0.5% -2% of Fe, 0.01% -0.2% of C and the balance of Ti, wherein the titanium alloy contains precipitated phase titanium carbide. Preferably, the titanium alloy comprises, by mass, 10% -20% of Zr, 10% -16% of Mo, 1% -4% of Sn, 0.5% -2% of Fe, 0.08% -0.2% of C and the balance of Ti, wherein the titanium alloy contains precipitated phase titanium carbide. Preferably, the mass percentage of Zr and Mo is 1-1.5:1. The invention also provides a preparation method of the biomedical titanium alloy with high strength and low modulus, which comprises the following steps: s1, weighing all raw material components according to mass percentages, and placing the raw material components in a vacuum smelting furnace; S2, vacuumizing, filling protective gas, and smelting all raw material components to obtain an ingot; S3, homogenizing the cast ingot to obtain a blank; S4, hot rolling the blank to obtain a plate; S5, carrying out solid solution and quenching treatment on the plate to obtain a titanium alloy primary blank; s6, carrying out natural aging strengthening on the titanium alloy primary blank to obtain the target titanium alloy. Preferably, in the step S1, graphite powder, titanium sponge, zirconium sponge, tin particles, iron particles and molybdenum particles are placed in the vacuum melting furnace from bottom to top in sequence, and the graphite powder is wrapped with a molybdenum foil. Further preferably, in the step S1, the purity of each raw material component is not lower than 99.95%, and the thickness of the molybdenum foil is 0.03mm to 0.05mm and the purity is not lower than 99.95%. Preferably, in the step S2, the metal component is melted into liquid and wrapped with graphite powder by adopting a current of 160a to 190a, and then the alloy liquid is flowed by adopting a current of 300a to 340a to realize primary homogenization of components, each ingot is smelted for 6 to 8 times, and each smelting is performed once for turning over. Preferably, in the step S3, firstly, the temperature of the cast ingot in a vacuum sintering furnace is raised to 450-550 ℃ at the speed of 8-10 ℃ per minute, the heat is preserved for 0.5-1 h, then the temperature is raised to 1000-1300 ℃ at the speed of 3-5 ℃ per minute, the heat is preserved for 1-2 h, and finally the cast ingot is cooled to room temperature along with the furnace. Preferably, in the step S4, the blank is first heat-preserved for 0.5-1 h at 700-800 ℃, then rolled, the single pressing deformation amount during rolling is 5-10%, the inter-pass furnace return is heat-preserved for 2-5 min, and the total deformation amount is 20-50%. Preferably, in the step S5, the plate i