Method for preparing super-elastic gradient-porosity porous NiTi alloy

A gradient pore and superelastic technology, which is applied in the field of preparation of porous NiTi shape memory alloy and gradient pore porous NiTi shape memory alloy, can solve the problem of continuous gradient pore porous NiTi alloy and achieve good mechanical properties and superelasticity

Inactive Publication Date: 2010-09-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] At present, the research on porous NiTi shape memory alloys is basically concentrated on the uniform pore porous NiTi shape memory alloy. There are basically no reports on the porous NiTi shape memory alloy with gradient pores, and there is no research on the continuous gradient pore porous NiTi alloy. , therefore, it is very necessary to prepare porous NiTi alloy with continuous gradient porosity

Method used

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  • Method for preparing super-elastic gradient-porosity porous NiTi alloy
  • Method for preparing super-elastic gradient-porosity porous NiTi alloy
  • Method for preparing super-elastic gradient-porosity porous NiTi alloy

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Effect test

Embodiment 1

[0032] Embodiment 1: (process flow such as figure 1 shown)

[0033] (1) Coarse titanium powder (containing the TiH of mass percentage concentration 30%) 2 , particle size 50~75 μm) and nickel powder are mixed according to the ratio of Ti atom and Ni atom ratio of 49.2:50.8 by ball milling method to obtain mixed powder 1; the particle size of the nickel powder is 70~80 μm, mixed powder 1 is numbered as S-I; the particle size of the nickel powder is 30-40 μm, and the number of the mixed powder 1 is S-II; the particle size of the nickel powder is 2-3 μm, and the number of the mixed powder 1 is S-III;

[0034] Mix pure titanium powder (purity is 99%, particle size 50-75 μm) and nickel powder according to the same atomic ratio of Ti and Ni to obtain mixed powder 2; the particle size of the nickel powder is 70-80 μm, and the number of mixed powder 2 is is S-IV; the particle size of the nickel powder is 30-40 μm, and the mixed powder 2 is numbered S-V; the particle size of the nick...

Embodiment 2

[0040] (1) thick titanium powder (containing the TiH of mass percentage concentration 40%) 2 , particle size 50~75 μm) and nickel powder are mixed according to the ratio of Ti atom and Ni atom ratio of 48:52 by ball milling method to obtain mixed powder 1; the particle size of the nickel powder is 70~80 μm, mixed powder 1 is numbered as S-I; the particle size of the nickel powder is 30-40 μm, and the number of the mixed powder 1 is S-II; the particle size of the nickel powder is 2-3 μm, and the number of the mixed powder 1 is S-III;

[0041]Mix pure titanium powder (purity is 99%, particle size 50-75 μm) and nickel powder according to the same atomic ratio of Ti and Ni to obtain mixed powder 2; the particle size of the nickel powder is 70-80 μm, and the number of mixed powder 2 is is S-IV; the particle size of the nickel powder is 30-40 μm, and the mixed powder 2 is numbered S-V; the particle size of the nickel powder is 2-3 μm, and the mixed powder 2 is numbered S-VI;

[004...

Embodiment 3

[0047] (1) Coarse titanium powder (containing the TiH of mass percent concentration 50%) 2 , particle size 50-75 μm) and nickel powder are mixed according to the ratio of Ti atom and Ni atom ratio of 47:53 by ball milling method to obtain mixed powder 1; the particle size of the nickel powder is 70-80 μm, and the number of mixed powder 1 is S-I; the particle size of the nickel powder is 30-40 μm, and the number of the mixed powder 1 is S-II; the particle size of the nickel powder is 2-3 μm, and the number of the mixed powder 1 is S-III;

[0048] Mix pure titanium powder (purity is 99%, particle size 50-75 μm) and nickel powder according to the same atomic ratio of Ti and Ni to obtain mixed powder 2; the particle size of the nickel powder is 70-80 μm, and the number of mixed powder 2 is is S-IV; the particle size of the nickel powder is 30-40 μm, and the mixed powder 2 is numbered S-V; the particle size of the nickel powder is 2-3 μm, and the mixed powder 2 is numbered S-VI;

...

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Abstract

The invention discloses a method for preparing a super-elastic gradient-porosity porous NiTi alloy, which comprises the following steps of: (1) mixing coarse titanium powder and nickel powder in an atomic ratio of (47-50):(53-50), numbering the mixed powder as S-I, S-II and S-III in turn according to the difference of particle sizes of the nickel powder, uniformly mixing pure titanium powder and nickel powder in the same atomic ratio of Ti to Ni, and numbering the mixed powder as S-IV, S-V and S-VI in turn according to the difference of particle sizes of the nickel powder; (2) dividing a mold into 2 to 5 layers along the radial or axial direction of the mold, and performing compression molding to obtain layered green body of the gradient-porosity porous NiTi alloy; and (3) sintering the green body in a sintering furnace in the atmosphere of protective gases to obtain the porous NiTi alloy in different gradient pore distribution. The porous NiTi shape memory alloy is suitable for tissue ingrowth and has good mechanical property.

Description

technical field [0001] The invention relates to the field of porous NiTi shape memory alloys, in particular to the field of preparation of gradient pore porous NiTi shape memory alloys. Background technique [0002] The many excellent properties of porous NiTi shape memory alloy make it very suitable for bone repair and replacement. For example, its superelasticity is similar to the mechanical behavior of bone, that is, it can return to its original shape after undergoing a large deformation (3% strain). However, the structure of the human bone is not uniform. From the section view of the human femoral head, it can be seen that it has a gradient transition, loose in the middle, relatively large pores, dense at the edges, and small pores. [0003] Existing studies have shown that the mechanical properties and superelasticity of porous NiTi alloys deteriorate with the increase of porosity, but low porosity and small pores are not conducive to the growth of human tissue cells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08A61L27/06A61L27/56
Inventor 袁斌李浩高岩曾美琴朱敏
Owner SOUTH CHINA UNIV OF TECH
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