Biomedical porous Ti alloy and preparation method

Abstract

The invention relates to a biomedical porous Ti alloy and a preparation method. The biomedical porous Ti alloy comprises the following components in percentage by weight: 20-22wt% of Nb, 6-8wt% of Zr, 4-6wt% of Mo, and the balance of Ti; the porosity and mechanical property adjustment range of the biomedical porous Ti alloy is wide; when the porosity is relatively low, the low modulus of elasticity and the high strength property can be achieved; and accordingly, the biomedical porous Ti alloy is suitable for preparation of a medical implant. The preparation method comprises the following specific steps: uniformly mixing Ti powder, Nb powder, Zr powder, Mo powder, TiH2 powder, and ZrH2 powder at the ratio; carrying out cold pressing to obtain a green body; sintering the green body in a sintering furnace filled with argon gas; after the sintering is finished, opening a gas bleed valve to quickly reduce the pressure in the sintering furnace to 0.15-0.30 MPa, and then powering off the sintering furnace; meanwhile, filling the sintering furnace with argon gas, so as to cool the obtained sinter; and finally, carrying out solution treatment on the cooled sinter. The preparation method is low in preparation cost, and the TiH2 powder and the ZrH2 powder are adopted as not only foaming materials but also alloy materials.

Description

technical field [0001] The invention relates to a biomedical porous titanium alloy and a preparation method, belonging to the technical field of preparation of titanium alloy materials. Background technique [0002] Titanium and its alloys have good biocompatibility, excellent mechanical properties, and corrosion resistance in body fluid environments. They are ideal for repairing human hard tissues such as artificial joints (hip, knee, ankle, shoulder, elbow) and dental implants. Alternative preferred materials, currently widely used are pure titanium and Ti 6 al 4 V(TC4). The existing problems are: ①The elastic modulus (100-115GPa) of the two titanium alloys is much higher than that of human cortical bone (5-27GPa), which causes a "stress shielding" effect at the interface between the implant and the bone, and bone fractures will occur after long-term use. Mass absorption and osteoporosis lead to aseptic loosening of the implant and shorten the service life; ② TC4 contai...

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Problems solved by technology

The existing problems are: ①The elastic modulus (100-115GPa) of the two titanium alloys is much higher than that of human cortical bone (5-27GPa), which causes a "stress shielding" effect at the interface between the implant and the bone, and bone fractures will occur after long-term use. Mass absorption and osteoporosis lead to aseptic loosening of the implant and shorten the service life; ② TC4 contains V and Al elements that are harmful to the human body, and there are potential safety hazards in long-term use

The disadvantage of this method is that the pore size distribution is extremely uneven, and due to the presence of pore-forming agents, it will cause varying degrees of pollution to the matrix metal.

Other preparation methods for porous titanium alloys include powder sintering rapid prototyping using electron beams and lasers to obtain a periodic porous lattice structure, but the pore size is single and large (generally greater than 500 μm), and the preparation equipment is expensive. Higher preparation cost

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