MnCoGe based ferromagnetic martensite phase-change material, preparation method and applications thereof

A technology of martensitic phase transformation and magnetic phase transformation, which is applied in the directions of magnetic materials, magnetic objects, electrical components, etc., to achieve the effects of easy control of composition, no rare earth elements, and simple preparation process

Active Publication Date: 2015-05-20
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to obtain a large magnetocaloric effect, for the normal MnCoGe system, people try to couple the Martensitic structural phase transition and the magnetic phase transition by introducing pressure or the substitution of Mn, Co, and Ge atoms, but so far there is no introduction of Ge vacancies to Martensitic Reports on the Effect of Structural Phase Transition and Magnetocaloric Effect

Method used

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  • MnCoGe based ferromagnetic martensite phase-change material, preparation method and applications thereof
  • MnCoGe based ferromagnetic martensite phase-change material, preparation method and applications thereof
  • MnCoGe based ferromagnetic martensite phase-change material, preparation method and applications thereof

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Embodiment 1

[0038] This embodiment according to the chemical formula MnCoGe 0.99 To prepare the phase change material of the present invention, the specific preparation method is as follows:

[0039] (1) According to the chemical formula MnCoGe 0.99 Prepare the raw materials, put the prepared raw materials into the electric arc furnace, and evacuate to 3×10 -3 Above Pa, after cleaning once with high-purity argon (purity 99.996wt%), under the protection of 1 atmospheric pressure of high-purity argon (purity 99.996wt%), the arc is started, and the melting temperature is 2000 ℃. After smelting, cool to room temperature in a copper crucible to obtain a cast alloy ingot.

[0040] (2) Wrap the alloy ingots prepared in step (1) with metal molybdenum sheets, and seal them in a vacuum quartz tube (the vacuum degree is 1×10 -4 Pa), after annealing at 875°C for 6 days, the quartz tube was taken out, cooled to room temperature naturally, and the quartz tube was broken to obtain MnCoGe 0.99 Phase...

Embodiment 2

[0048] This embodiment according to the chemical formula MnCoGe 0.97 To prepare the phase change material of the present invention, the specific preparation method is as follows:

[0049] (1) According to the chemical formula MnCoGe 0.97 Prepare the raw materials, put the prepared raw materials into the electric arc furnace, and evacuate to 3×10 -3 Above Pa, after cleaning twice with high-purity argon (purity 99.996wt%), under the protection of 1 atmospheric pressure of high-purity argon (purity 99.996wt%), the arc is started, and the melting temperature is 2000 ℃. After smelting, cool to room temperature in a copper crucible to obtain a cast alloy ingot.

[0050] (2) Wrap the alloy ingots prepared in step (1) with metal molybdenum sheets, and seal them in a vacuum quartz tube (the vacuum degree is 1×10 -4 Pa), after annealing at 875°C for 6 days, the quartz tube was taken out, cooled to room temperature naturally, and the quartz tube was broken to obtain MnCoGe 0.97 Phas...

Embodiment 3

[0058] This embodiment according to the chemical formula MnCoGe 0.96 To prepare the phase change material of the present invention, the specific preparation method is as follows:

[0059] (1) According to the chemical formula MnCoGe 0.96 Prepare the raw materials, put the prepared raw materials into the electric arc furnace, and evacuate to 3×10 -3 Above Pa, after cleaning twice with high-purity argon (purity 99.996wt%), under the protection of 1 atmospheric pressure of high-purity argon (purity 99.996wt%), the arc is started, and the melting temperature is 2000 ℃. After smelting, cool to room temperature in a copper crucible to obtain a cast alloy ingot.

[0060] (2) Wrap the alloy ingots prepared in step (1) with metal molybdenum sheets, and seal them in a vacuum quartz tube (the vacuum degree is 1×10 -4 Pa), after annealing at 875°C for 6 days, the quartz tube was taken out, cooled to room temperature naturally, and the quartz tube was broken to obtain MnCoGe 0.96 Phas...

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Abstract

The invention provides a MnCoGe based ferromagnetic martensite phase-change material, a preparation method and applications thereof. The chemical formula of the phase-change material is MnCoGe<1-x>, 0<x<=0.05. The phase-change material has a martensite structure phase change, which is coupled with a magnetic phase change. As the temperature decreases, the phase change material changes from paramagnetic high-temperature austenite parent phase with a Ni2In hexagonal structure to ferromagnetic low-temperature martensite phase with a TiNiSi type orthorhombic structure, and the phase change property is one grade. The magnetic / structural phase-change coupling temperature of the provided phase-change material is continuously adjustable in a wide temperature range (310-340K), which is slightly higher than the room temperature, along with the change of the Ge vacancy concentration. The material system has the characteristics of abundant raw material reserves, simple technology, and suitability for industrial production.

Description

technical field [0001] The invention relates to a magnetic functional material, in particular to a MnCoGe which can realize magnetic / structural phase transition coupling and has a large magnetocaloric effect 1-x Magnetic refrigeration material and its preparation method and use. Background technique [0002] Magnetic refrigeration technology is a green and environmentally friendly refrigeration technology. Compared with the traditional gas compression and expansion refrigeration technology, magnetic refrigeration uses magnetic substances as the refrigerant, which has no damage to the ozone layer and no greenhouse effect. In terms of refrigeration efficiency, magnetic refrigeration can reach 30%-60% of the Carnot cycle, while refrigeration cycles that rely on gas compression and expansion generally can only reach 5%-10% of the Carnot cycle. Therefore, magnetic refrigeration technology has a good application Prospect, known as high-tech green refrigeration technology. Magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22B4/06H01F1/047
Inventor 包立夫胡凤霞武荣荣王晶刘瑶郑新奇孙继荣沈保根宫华扬
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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