Preparation method of porous nickel titanium shape memory alloy

A memory alloy and porous nickel technology, which is applied in the field of preparation of porous nickel-titanium shape memory alloy, can solve the problems of short process and low cost, and achieve the effects of controllable pore structure, low cost, simple, stable and efficient process

Inactive Publication Date: 2013-04-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention combines pore-forming agent technology with SPS technology, selects a pore-forming agent with a high melting point, water solubility (or hydrolysis) and can exist stably during SPS sintering, uses the pore-forming agent to control the pore structure of the product, and uses SPS to High-efficiency intensified sintering overcomes the shortcomings of the existing preparation technology, such as the difficulty in controlling the pore structure and unstable process, and has the characteristics of short process, low cost and high efficiency

Method used

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  • Preparation method of porous nickel titanium shape memory alloy
  • Preparation method of porous nickel titanium shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) First determine the volume V of the porous nickel-titanium shape memory alloy as required 总 (Using a mold with an inner diameter of Φ20mm x a height of 40mm, V 总 =12.56cm 3 ) and porosity of 40%, and then calculate the mass m of each raw material according to the following formula, weigh Ni powder with a particle size of 21-44 μm and a purity of 98.8-99.9%, and Ti powder with a particle size of 21-44 μm and a purity of 99.5-99.9% and SrSO 4 (The melting point is higher than 750°C, and thermal decomposition does not occur within the SPS sintering temperature range, the particle size is 75-150 μm, and the purity is ≥98%), and mixed for 40 minutes:

[0039] (1)

[0040] (2)

[0041] (3)

[0042] (4)

[0043] (5)

[0044] (6)

[0045] In the formula, V represents volume; ρ represents density; m represents ...

Embodiment 2

[0050] (1) First determine the volume V of the porous nickel-titanium shape memory alloy as required 总 (Using a mold with an inner diameter of Φ10mm×a height of 25mm, V 总 =1.96cm 3 ) and porosity of 60%, and then calculate the mass m of each raw material according to the following formula, weigh Ni powder with a particle size of 21-44 μm and a purity of 98.8-99.9%, and Ti powder with a particle size of 21-44 μm and a purity of 99.5-99.9% and analytically pure K 2 CO 3 (The melting point is higher than 750°C, and no thermal decomposition occurs within the SPS sintering temperature range, the particle size is 200-400μm, and the purity is ≥98%), and mixed for 150min:

[0051] (1)

[0052] (2)

[0053] (3)

[0054] (4)

[0055] (5)

[0056] (6)

[0057] In the formula, V represents volume; ρ represents density; m re...

Embodiment 3

[0062] (1) First determine the volume V of the porous nickel-titanium shape memory alloy as required 总 (Using a mold with an inner diameter of Φ20mm x a height of 40mm, V 总 =12.56cm 3 ) and porosity of 70%, and then calculate the mass m of each raw material according to the following formula, weigh Ni powder with a particle size of 21-44 μm and a purity of 98.8-99.9%, and Ti powder with a particle size of 21-44 μm and a purity of 99.5-99.9% and BaC 2 (The melting point is higher than 750°C, and thermal decomposition does not occur within the SPS sintering temperature range, the particle size is 300-1000μm, and the purity is ≥98%), and mixed for 30 minutes:

[0063] (1)

[0064] (2)

[0065] (3)

[0066] (4)

[0067] (5)

[0068] (6)

[0069] In the formula, V represents volume; ρ represents density; m represents ...

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Abstract

The invention provides a preparation method of a porous nickel titanium shape memory alloy, which comprises the following steps: determining volume V total porosity of the obtained porous nickel titanium shape memory alloy according to demands, calculating the mass m of every raw material according to the formula, weighing Ni powder, Ti powder and a pore forming agent, and mixing for 30-150 minutes; carrying out discharge plasma sintering at 750-1100 DEG C for 8-30 minutes to obtain a sintered body; and after cooling to room temperature, infusing with water for 30-180 minutes until the pore forming agent is completely dissolved or reacted, thereby obtaining the porous nickel titanium shape memory alloy. The porosity and pore size are controlled through and volume percent, and the reinforced sintering action of SPS and the removal of the soluble salt pore forming agent are utilized to implement the preparation of the controllable-pore-structure porous nickel titanium shape memory alloy. The porosity of the porous nickel titanium shape memory alloy is 40-70%, and the pore size is 75-1000 mu m. The porous nickel titanium shape memory alloy has the characteristics of low cost, controllable pore structure, and simple, stable and efficient technique, and can implement industrial production.

Description

technical field [0001] The invention relates to a preparation method of a porous nickel-titanium shape memory alloy, which belongs to the technical field of porous biological materials. Background technique [0002] Porous nickel-titanium shape memory alloy (porous Ni-Ti alloy with equal atomic ratio) has good shape memory effect, pseudoelasticity, biocompatibility and good mechanical properties, and has a broad application market in the fields of biomedicine and biomaterials . The currently known preparation methods of nickel-titanium shape memory alloys are mainly element powder mixing sintering method, pre-alloy powder sintering method and self-propagating high-temperature synthesis method. The powder metallurgy method has the disadvantages of difficulty in controlling the pore structure and low porosity of the product. Although the self-propagating high-temperature synthesis method has a simple process, it has the disadvantages of difficult control of process stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C14/00C22C19/03C22C30/00
Inventor 左孝青董晓蓉陆建生周芸陈冬华
Owner KUNMING UNIV OF SCI & TECH
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