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Preparation method and application of hyperelastic porous CuAlNi high temperature shape memory alloy

A technology of memory alloy and superelasticity, which is applied in the field of preparation of superelastic porous CuAlNi high temperature shape memory alloy, can solve problems such as limiting the scope of application, and achieve good mechanical properties, superelasticity, and good high temperature cycle stability.

Inactive Publication Date: 2013-04-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on this principle, some researchers have prepared a porous NiMnGa magnetic memory alloy with a bamboo-like crystal structure by infiltration and precipitation. Each grain is only adjacent to one grain, and the other surfaces are connected to the pore wall. The magnetic memory performance of this polycrystalline sample is close to that of a single crystal, but the porosity of this porous alloy is generally greater than 50%, which must limit its application range

Method used

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  • Preparation method and application of hyperelastic porous CuAlNi high temperature shape memory alloy
  • Preparation method and application of hyperelastic porous CuAlNi high temperature shape memory alloy
  • Preparation method and application of hyperelastic porous CuAlNi high temperature shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Prepare Cu by arc melting 81.5 Al 14。5 Ni 4 (wt.%) alloy ingot;

[0046] (2) NaAlO with a purity of 99% and a particle size of 350~510μm 2 The powder is pressed into a green body, the pressing force is 10MPa, the temperature is 30°C, and the time is 10 minutes; the sintering is carried out in an air atmosphere, the sintering temperature is 1400°C, and the sintering time is 12 hours to obtain NaAlO 2 Block

[0047] (3) Put NaAlO 2 Put the block into the bottom of the tube furnace that can move up and down, and then place it in NaAlO 2 Put Cu on the block 81.5 Al 14.5 Ni 4 Alloy ingot, in 5×10 -3 Under Pa vacuum, keep at 1200℃ for 0.5h, then fill 1.2×10 5 Pa with argon gas and keep it for 2h, then move the tube furnace down out of the heating zone at a speed of 5mm / min, and get Cu after cooling 81.5 Al 14.5 Ni 4 And NaAlO 2 Composite materials;

[0048] Cut this composite material and found that the CuAlNi alloy has been completely penetrated by NaAlO 2 In the interstices bet...

Embodiment 2

[0055] (1) Prepare Cu by arc melting 83 Al 13 Ni 4 (wt.%) alloy ingot;

[0056] (2) NaAlO with a purity of 99% and a particle size of 300~450μm 2 The powder is pressed into a green body, the pressing force is 50MPa, the temperature is 50°C, and the time is 5 minutes; the sintering is carried out in the air atmosphere, the sintering temperature is 1500°C, and the sintering time is 15 hours to obtain NaAlO 2 Block

[0057] (3) Put NaAlO 2 Put the block into the bottom of the tube furnace that can move up and down, and then place it in NaAlO 2 Put CuAlNi alloy ingot on the block, in 2×10 -3 Under Pa vacuum, keep it at 1250℃ for 5h, then charge 2×10 5 Pa with argon gas and keep it for 5h, then move the tube furnace down out of the heating zone at a speed of 1mm / min, and get CuAlNi and NaAlO after cooling 2 Composite materials;

[0058] Cut this composite material and found that the CuAlNi alloy has been completely penetrated by NaAlO 2 In the interstices between particles (such as Figure...

Embodiment 3

[0064] (1) Prepare Cu by arc melting 81.5 Al 14 Ni 4.5 (wt.%) alloy ingot;

[0065] (2) Combine NaAlO with 99% purity and 50μm particle size 2 The powder is pressed into a green body with a pressing force of 600MPa, a temperature of 100°C, and a time of 1 hour; sintering is carried out in an air atmosphere at a sintering temperature of 1500°C and a sintering time of 24 hours to obtain NaAlO 2 Block

[0066] (3) Put NaAlO 2 Put the block into the bottom of the tube furnace that can move up and down, and then place it in NaAlO 2 Put CuAlNi alloy ingot on the block, in 1×10 -3 Under Pa vacuum, keep at 1200℃ for 2h, and then charge 2×10 5 Pa with argon gas and keep it for 5h, then move the tube furnace downwards out of the heating zone at a speed of 5mm / min, and get CuAlNi and NaAlO after cooling 2 Composite materials;

[0067] Cut this composite material and found that CuAlNi alloy basically did not infiltrate NaAlO 2 In the space between the particles, NaAlO 2 The boundary between the b...

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Abstract

The invention discloses a preparation method of a hyperelastic porous CuAlNi high temperature shape memory alloy, which comprises the following steps: preparing a CuAlNi alloy ingot by adopting an electric arc melting or induction melting method; pressing NaAlO2 powder into a green body and sintering the green body in the air atmosphere to obtain an NaAlO2 block body; placing the NaAlO2 block body into the bottom of a tubular furnace capable of moving up and down, placing the CuAlNi alloy ingot on the NaAlO2 block body and carrying out heat preservation in the vacuum atmosphere; and then filling protection gas, keeping filling the protection gas, removing the tubular furnace downwards out of a heating region, cooling the obtained product, immersing the cooled product into weak acid to carry out ultrasonic oscillation, then placing the product into a vacuum furnace, carrying out heat treatment on the product in the protection atmosphere and quenching into ice water to obtain the hyperelastic porous CuAlNi high temperature shape memory alloy. The porous CuAlNi shape memory alloy prepared by the preparation method has excellent hyperelasticity and mechanical property at high temperature and also shows excellent cycling stability.

Description

Technical field [0001] The invention relates to the field of porous CuAlNi high temperature shape memory alloys, in particular to a preparation method and application of a superelastic porous CuAlNi high temperature shape memory alloy. Background technique [0002] Porous shape memory alloys can exhibit many excellent properties that are only available in shape memory alloys and porous materials, such as unique shape memory effect and superelasticity, light weight, adjustable mechanical properties, high specific surface area and damping properties. Therefore, porous shape memory alloys have huge application prospects in many fields, such as hard tissue replacement, energy absorbing devices, and battery electrode materials. Among several porous shape memory alloys that have been prepared (including NiTi-based, Cu-based and Fe-based), porous NiTi memory alloy is considered to be the most valuable one because of its stable shape memory effect and Super elasticity, good biocompatibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C9/01C22F1/08
Inventor 袁斌郑佩琪戴维杜南
Owner SOUTH CHINA UNIV OF TECH
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