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Preparation method for porous copper-based shape memory alloy

A technology of memory alloy and porous copper, which is applied in the field of preparation of shape memory alloy, can solve the problems of low mechanical properties of shape memory alloy, and achieve the effect of simple and easy preparation method, suitable for popularization and application, and improvement of mechanical properties.

Inactive Publication Date: 2018-10-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional preparation method, there is a defect that the mechanical properties of the synthesized shape memory alloy are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a porous copper-based shape memory alloy, comprising the following steps:

[0023] Step 1. Mix powder

[0024] Weigh the raw materials of pure Cu powder, pure Al powder, pure Mn powder and rare earth as required, add stearic acid as an additive, and ball mill on a planetary ball mill for 8 hours under the protection of argon. The ball-to-material ratio used in ball milling 10:1, the speed of the ball mill is 300 rpm, and thus the rare earth composite Cu-Al-Mn pre-alloyed powder is prepared;

[0025] Step 2. Compression

[0026] Uniformly mix the rare earth composite Cu-Al-Mn pre-alloyed powder prepared in step 1 with absolute ethanol, then evenly mix with decrystallized water NaCl particles, add a pore-forming agent, and put the homogeneous mixture into a compression mold, one-way Pressurize to 250MPa, and hold the pressure for 1 minute to obtain a green body;

[0027] Step 3, sintering

[0028] Place the green body prepared in step 2 in a si...

Embodiment 2

[0034] A preparation method of a porous copper-based shape memory alloy, comprising the following steps:

[0035] Step 1. Mix powder

[0036] Weigh the raw materials of pure Cu powder, pure Al powder, pure Mn powder and rare earth as required, add stearic acid as an additive, and ball mill on a planetary ball mill for 10 hours under the protection of argon. 10:1, the speed of the ball mill is 300 rpm, and thus the rare earth composite Cu-Al-Mn pre-alloyed powder is prepared;

[0037] Step 2. Compression

[0038] Uniformly mix the rare earth composite Cu-Al-Mn pre-alloyed powder prepared in step 1 with absolute ethanol, then evenly mix with decrystallized water NaCl particles, add a pore-forming agent, and put the homogeneous mixture into a compression mold, one-way Pressurize to 300MPa, and hold the pressure for 2 minutes to obtain a green body;

[0039] Step 3, sintering

[0040] Place the green body prepared in step 2 in a sintering furnace, vacuumize to 80Pa, then fill ...

Embodiment 3

[0046] A preparation method of a porous copper-based shape memory alloy, comprising the following steps:

[0047] Step 1. Mix powder

[0048] Weigh raw material pure Cu powder, pure Al powder, pure Mn powder and rare earth according to need to carry out batching respectively, add stearic acid as additive, under the protection of argon, ball mill on planetary ball mill for 1-2 hours, the ball material that adopts in ball mill The ratio is 10:1, and the speed of the ball mill is 300 rpm, so that the rare earth composite Cu-Al-Mn pre-alloyed powder is prepared;

[0049] Step 2. Compression

[0050] Uniformly mix the rare earth composite Cu-Al-Mn pre-alloyed powder prepared in step 1 with absolute ethanol, then evenly mix with decrystallized water NaCl particles, add a pore-forming agent, and put the homogeneous mixture into a compression mold, one-way Pressurize to 320MPa, and hold the pressure for 3 minutes to obtain a green body;

[0051] Step 3, sintering

[0052] Place th...

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Abstract

The invention discloses a preparation method for porous copper-based shape memory alloy. The method comprises the following steps that powder is mixed, specifically, raw materials of pure Cu powder, pure Al powder, pure Mn powder and rare earth are weighed respectively as required for burdening, stearic acid is added as an additional agent, and rare earth compound Cu-Al-Mn prealloyed powder is obtained; pressing is conducted, specifically, the rare earth compound Cu-Al-Mn prealloyed powder and absolute ethyl alcohol are mixed evenly and then evenly mixed with NaCl particles with crystal waterbeing removed, a pore-forming agent is added, the evenly mixed material is put in a pressing die, pressure is unidirectionally increased to 250-320 MPa, pressure is maintained for 1-3 min, and a blankis obtained; and sintering is conducted, and the porous copper-based shape memory alloy product is obtained. By adopting the preparation method for the porous copper-based shape memory alloy, the mechanical property of the prepared copper-based shape memory alloy can be improved, the shape memory effect of the prepared copper-based shape memory alloy can also be improved obviously, and the preparation method is easy and convenient to operate and suitable for application and popularization.

Description

technical field [0001] The invention relates to the preparation of a shape memory alloy, in particular to a method for preparing a porous copper-based shape memory alloy. Background technique [0002] Shape memory alloys (shape memory alloys, SMA) are materials composed of two or more metal elements that have a shape memory effect (shape memory effect, SME) through thermoelasticity and martensitic transformation and their inversion. Shape memory alloy is currently the material with the best shape memory performance among shape memory materials. So far, people have found more than 50 alloys with shape memory effect. There are many successful examples in the application in the aerospace field. Huge antennas on artificial satellites can be made of memory alloys. Before launching an artificial satellite, the parabolic antenna is folded up and put into the satellite body. After the rocket lifts off to send the artificial satellite to the predetermined orbit, it only needs to b...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22F1/08B22F3/11
CPCB22F3/11C22C1/0425C22F1/006C22F1/08
Inventor 郭一萍
Owner XIAN UNIV OF SCI & TECH
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