Method for synthesizing NiMnGaCo magnetic memory alloy at high temperature through combustion reaction

A technology of combustion reaction and magnetic memory, which is applied in the field of high-temperature synthesis of NiMnGaCo magnetic memory alloy by combustion reaction, which can solve the problems of poor machining performance and high brittleness of magnetic memory alloy, and achieve the effects of high toughness, reduced grain size and fine structure

Active Publication Date: 2018-12-18
DALIAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of high brittleness and poor machinability of existing NiMnGa series magnetic memory alloys, the present invention provides a method for synthesizing NiMnGaCo magnetic memory alloys at high temperature through combustion reaction. Change the phase transition temperature of the alloy significantly and improve its mechanical and physical properties, doping an appropriate amount of Co element in the NiMnGa alloy, and then synthesize NiMnGaCo magnetic memory alloy through combustion reaction at high temperature to improve the mechanical properties of the alloy and improve the shape memory effect

Method used

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  • Method for synthesizing NiMnGaCo magnetic memory alloy at high temperature through combustion reaction
  • Method for synthesizing NiMnGaCo magnetic memory alloy at high temperature through combustion reaction
  • Method for synthesizing NiMnGaCo magnetic memory alloy at high temperature through combustion reaction

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Embodiment 1

[0025] The preparation method of the high-strength and high-plasticity NiMnGaCo magnetic memory alloy of this embodiment is prepared as follows: Take 46 parts of Ni powder, 25 parts of Mn powder, 25 parts of Ga powder and 4 parts of 5 micron particle size in atomic percentage. The Co powder is mixed, the metal powder is stirred in a mixer at a speed of 200 revolutions / min-500 revolutions / min to make it evenly mixed, then pour it into the pressure forming mold, press the mold with a jack, and press Press the powder into a cylindrical sample with a diameter of 10mm and a height of 10mm under a pressure of 400-1000MPa and holding pressure for 2-4 minutes, and finally sinter it at a temperature of 1000-1200℃ and a holding time of 20-40 minutes. A NiMnGaCo magnetic memory alloy with a particle size of 20-30 microns is obtained.

Embodiment 2

[0027] The preparation method of the high-strength and high-plasticity NiMnGaCo magnetic memory alloy of this embodiment is prepared as follows: Take 50 parts of Ni powder, 25 parts of Mn powder, 25 parts of Ga powder and 1 part of 5 micron particle size in atomic percentage The Co powder is mixed, the metal powder is stirred in a mixer at a speed of 200 revolutions / min-500 revolutions / min to make it evenly mixed, then pour it into the pressure forming mold, press the mold with a jack, and press Press the powder into a cylindrical sample with a diameter of 10mm and a height of 10mm under a pressure of 400-1000MPa and holding pressure for 2-4 minutes, and finally sinter it at a temperature of 1000-1200℃ and a holding time of 30 minutes. NiMnIn magnetic memory alloy with a diameter of 20-30 microns.

Embodiment 3

[0029] The preparation method of the high-strength and high-plasticity NiMnGaCo magnetic memory alloy of this embodiment is prepared as follows: according to atomic percentages, 47 parts of Ni powder with a particle size of 5 microns, 25 parts of Mn powder, 25 parts of Ga powder and 3 parts of Co powder is mixed, and the metal powder is stirred in a mixer at a speed of 200 revolutions / min-500 revolutions / min to make it evenly mixed, then pour it into the pressure forming mold, press the mold with a jack, and press it to Press the powder into a cylindrical sample with a diameter of 10mm and a height of 10mm under pressure of 400-1000MPa and holding pressure for 2-4 minutes, and finally sintering process at a temperature of 1200℃ and a holding time of 20-40 minutes to obtain the particle size It is a 20-30 micron NiMnGaCo magnetic memory alloy.

[0030] The high-strength and high-plasticity NiMnGaCo alloy prepared in Example 1 was tested for fracture strength and fracture strain. T...

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Abstract

The invention discloses a method for synthesizing a NiMnGaCo magnetic memory alloy at a high temperature through a combustion reaction and relates to the preparation method of the magnetic shape memory alloy. According to the method, the combustion reaction is adopted for the first time to synthesize the novel magnetic NiMnGaCo shape memory alloy, and a way is expanded for the application of the high-temperature and high-plasticity shape memory alloy. The high-strength and high-plasticity NiMnGaCo is prepared through the following steps that materials are taken according to the atomic percentand are mixed to be uniform and sintered, and then the high-strength and high-plasticity NiMnGaCo is obtained. The magnetic shape memory alloy NiMnGaCo prepared through the method has the advantages of being good in toughness, high in strength, fine in organization and the like.

Description

Technical field [0001] The invention relates to a method for high-temperature synthesis of NiMnGaCo magnetic memory alloy by combustion reaction. Background technique [0002] Magnetically driven shape memory alloys have the advantages of high response frequency and large output strain, and have received great attention in recent years. At present, magnetically driven shape memory effects have been found in many alloys, mainly including: Ni-Mn-Ga, Ni-Fe-Ga, Fe-Pd, Fe-Pt, Ni-Mn-Al, Co-Ni-Ga, Co- Ni-Al and Ni-Mn-X (X=In, Sn, Sb) alloys, etc. Among them, Ni-Mn-Ga is the first magnetically driven shape memory alloy to be discovered and also the most potential application. [0003] In 1996, Ullakko et al. 2 A reversible strain of about 0.2% was obtained in MnGa single crystal, which opened the prelude to the research of magnetic drive memory alloys and has become a research hotspot in the field of shape memory alloys. Researchers at home and abroad have successively carried out resea...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/03C22C30/00
CPCB22F2998/10C22C1/0433C22C19/005C22C19/03C22C30/00C22C2202/02B22F3/02B22F3/10
Inventor 董桂馥王兴安张倩倩
Owner DALIAN UNIVERSITY
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