Medical implant porous Ti alloy and preparation method

A titanium alloy and particle size technology, applied in the field of medical implantation of porous titanium alloys and its preparation, can solve the problems of single pore size, shortened service life, base metal pollution, etc., and achieves low inclusion content, improved strength, and high elastic modulus. the effect of strength

Active Publication Date: 2017-05-31
SOUTHEAST UNIV
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  • Application Information

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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

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] With high purity Ti, Nb, Ta, TiH 2 and ZrH 2 The powder is used as a raw material to prepare an alloy. The weight and particle size of each component are: Ti powder 40.467g, of which 20μm and 50μm Ti powder have the same weight; Nb powder 38.000g, 25μm; Ta powder 2.000g, of which 10μm and 20μm Ta powder have the same weight; Ti H 2 Powder 16.187g, 10μm; ZrH 2 Powder 4.088g, 10μm. The weight percent of each alloy element is: Nb: 38wt%; Zr: 4wt%; Ta: 2wt% and the balance is Ti. Put the powder into a vacuum ball mill tank, mix it in a three-dimensional motion mixer for 6 hours, and then cold press the powder into a cylindrical green body in a mold with a pressure of 200MPa; put the cylindrical green body into a vacuum sintering furnace , filled with argon with a purity of 99.990vol% and a pressure of 0.10MPa after vacuumizing in a cold state. Then heat up to 900°C at a heating rate of 300°C / h and keep the temperature for 3h. After the sintering is completed, open the...

Embodiment 2

[0047] With high purity Ti, Nb, Ta, TiH 2 and ZrH 2 The powder is used as a raw material to prepare an alloy. The weight and particle size of each component are: Ti powder 40.987g, of which 20μm, 50μm and 70μm Ti powder have an equal weight; Nb powder 37.300g, of which 25μm and 50μm Nb powder have an equal weight; Ta powder 1.300g , 15 μm; TiH 2 Powder 17.625g, 20μm; ZrH 2 Powder 3.577g, 15μm. The weight percent of each alloy element is: Nb: 37.3wt%; Zr: 3.5wt%; Ta: 1.3wt% and the balance is Ti. Put the powder into a vacuum ball mill tank and mix it in a three-dimensional motion mixer for 6.5 hours, then cold press the powder into a cylindrical green body in a mold with a pressure of 180MPa; put the cylindrical green body into a vacuum sintering furnace In the cold state, after evacuating in a cold state, it is filled with argon gas with a purity of 99.999vol%, and the pressure is 0.12MPa, and then heated to 950°C at a heating rate of 285°C / h, and kept for 2.5h. After the...

Embodiment 3

[0049] With high purity Ti, Nb, Ta, TiH 2 and ZrH 2 The powder is used as the raw material to prepare the alloy. The weight and particle size of each component are: Ti powder 40.546g, of which 50μm and 70μm Ti powder have the same weight; Nb powder 37.000g, 50μm; Ta powder 1.000g, 20μm; TiH 2 Powder 20.273g, of which 15μm and 25μm TiH 2 Powder weight is equal; ZrH 2 Powder 2.044g, 25μm. The weight percent of each alloy element is: Nb: 37wt%; Zr: 2wt%; Ta: 1wt%, and the balance is Ti. Put the powder into a vacuum ball mill tank and mix it in a three-dimensional motion mixer for 8 hours, then cold press the powder into a cylindrical green body in a mold with a pressure of 150MPa; put the cylindrical green body into a vacuum sintering furnace , after the cold state is vacuumized, it is filled with argon with a purity of 99.999vol%, and the pressure is 0.15MPa, and then heated to 1050°C at a heating rate of 250°C / h, and kept for 1.5h. After the sintering is completed, open th...

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Abstract

The invention relates to a medical implant porous Ti alloy and a preparation method. The medical implant porous Ti alloy comprises the following components in percentage by weight: 37-38wt% of Nb, 2-4wt% of Zr, 1-2wt% of Ta, and the balance of Ti. The preparation method comprises the following specific steps: uniformly mixing Ti powder, Nb powder, Ta 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 and aging treatment on the cooled sinter, so as to obtain the medical implant porous Ti alloy. According to the medical implant porous Ti alloy and the preparation method provided by the invention, TiH2 and ZrH2 particles are adopted as not only foaming materials but also alloy materials; the porous Ti purity is high; the porosity and mechanical property adjustment range is wide; when the porosity is relatively low, the low modulus of elasticity and the high strength property can be achieved; accordingly, the medical implant porous Ti alloy is suitable for preparation of a medical implant; and the preparation cost is low.

Description

technical field [0001] The invention relates to a porous titanium alloy for medical implantation and a preparation method thereof, 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 Al4 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 serv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00B22F3/11C22C1/08
CPCB22F3/1125C22C14/00
Inventor 陈锋余新泉张友法
Owner SOUTHEAST UNIV
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