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A nickel-free superelastic titanium-based shape memory alloy and its preparation method and application

A technology of memory alloy and superelasticity, which is applied in the field of memory alloy materials to achieve the effects of high recoverable strain, low modulus and low production cost

Active Publication Date: 2018-07-13
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance evaluation of the new shape memory titanium alloy reported above is currently mainly focused on the basic performance evaluation such as recoverable strain rate, tensile strength, and compressive strength. Fatigue resistance, etc. are hardly involved

Method used

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  • A nickel-free superelastic titanium-based shape memory alloy and its preparation method and application
  • A nickel-free superelastic titanium-based shape memory alloy and its preparation method and application
  • A nickel-free superelastic titanium-based shape memory alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment mainly consists of 33.5wt.% titanium, 63wt.% zirconium, 2wt.% molybdenum, and 1.5wt.% manganese. Embodiment 1 main preparation method, comprises the following steps:

[0044](1) Proportioning pure Ti powder, Zr powder, Mo powder, and Mn powder according to the mass percentage of Example 1, using ball milling method (ball mill) to mix the powder evenly, the ball milling time is 6 hours, and the purity of the powder used is all at 99.5wt % or more, the mesh number is 300 mesh. Then the uniformly mixed powder is cold isostatically pressed in the compression medium hydraulic oil, the actual pressure is 172MPa, the temperature is 30-100°C, and the holding time is 5 minutes to obtain a green body.

[0045] (2) Put the green body prepared in step (1) into a vacuum sintering furnace for high-temperature sintering. The sintering condition is heated at 5°C per minute to 1200°C at room temperature, and kept at 1200°C for 5 hours. Cooling, during which the vacuum ...

Embodiment 2

[0056] This embodiment mainly consists of 33wt.% titanium, 63wt.% zirconium, 2wt.% molybdenum, and 2wt.% manganese. Embodiment 2 main preparation method, comprises the following steps:

[0057] (1) Except that the pure Ti powder, Zr powder, Mo powder, and Mn powder are proportioned according to the mass percentage of the embodiment 2, the step (1) of the embodiment 2 is consistent with the step (1) of the implementation 1.

[0058] (2) Step (2) of Example 2 is consistent with Step (2) of Example 1, and the shape memory alloy of Example 2 with low modulus and high strength is prepared.

[0059] Carry out porosity measurement (method is the same as embodiment 1) to the shape memory alloy of sintered embodiment 2, the porosityfigure 1 c and 1d, figure 1 The alloy grains shown in c are mostly hexagonal and belong to the β phase of titanium alloy. figure 1 The needle-like precipitates in the grains and grain boundaries shown in d belong to the α"phase.

[0060] The shape-memory ...

Embodiment 3

[0062] This embodiment mainly consists of 32.6wt.% titanium, 63wt.% zirconium, 2wt.% molybdenum, and 2.4wt.% manganese. Embodiment 2 main preparation method, comprises the following steps:

[0063] (1) Except that the pure Ti powder, Zr powder, Mo powder, and Mn powder are proportioned according to the mass percentage of the embodiment 3, the step (1) of the embodiment 3 is consistent with the step (1) of the implementation 1.

[0064] (2) Step (2) of Example 3 is consistent with Step (2) of Example 1, and the shape memory alloy of Example 3 with low modulus and high strength is prepared.

[0065] Carry out porosity measurement (same as embodiment 1) to the memory alloy of sintered embodiment 3, the porosityfigure 1 As shown in e and 1f, figure 1 The alloy grains shown in e are mostly hexagonal and belong to the β phase of titanium alloy. figure 1 The needle-like precipitates in the crystal grains and grain boundaries shown in f belong to the α"phase.

[0066] Carry out roo...

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Abstract

The invention discloses a nickel-free super-elastic titanium-based shape memory alloy, and preparation and application thereof. The shape memory alloy includes, by mass, 57-63% of Zr, 2-8% of Mo, 1.5-2.4% of Mn, and the balanced being Ti and unavoidable impurities. The nickel-free super-elastic titanium-based shape memory alloy has high recoverable strain, low modulus and high strength, is good in wearability, can be directly processed to produce various special-shaped devices and allows large-scale industrial production, is suitable for repair and substitution of hard tissue in human body in the field of biomedical materials, and also can be used in the field of industrial products.

Description

technical field [0001] The invention belongs to the field of memory alloy materials, in particular to a nickel-free superelastic titanium-based shape memory alloy and its preparation and application. Background technique [0002] In orthopedic surgery, nickel-titanium (NiTi) shape memory alloy has been widely used in the medical field in the past 20 years due to its unique shape memory effect, and has been used to make scoliosis orthotics, pressurized staples , intramedullary nails, bone superelastic wire, joint joints and other products. The unique superelasticity of nickel-titanium alloy is similar to the mechanical behavior of human bone, which can return to its original shape after a large strain (>3%). At the same time, nickel-titanium memory alloy has good comprehensive mechanical properties due to superelasticity, including high fatigue resistance, etc.; and it has a relatively low elastic modulus, which can reduce the "stress shielding" effect after implantation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C16/00C22C1/04A61L31/14A61L31/02A61L29/14A61L29/02A61L27/50A61L27/06G02C5/00A41C3/12A63B53/04
CPCA41C3/12A61L27/06A61L27/50A61L29/02A61L29/14A61L31/022A61L31/14A61L2400/16A61L2430/12A63B53/04B22F2998/10B22F2999/00C22C1/0458C22C16/00G02C5/008B22F3/04B22F3/1007B22F2201/11B22F2201/20
Inventor 王小健李卫刘晖
Owner JINAN UNIVERSITY
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