A kind of mncoge-based ferromagnetic martensitic phase change material and its preparation method and application

A technology of martensitic phase transformation and ferromagnetism, applied in the direction 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

A technology of martensitic phase transformation and ferromagnetism, applied in the direction 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

CN104630568BActive Publication Date: 2017-06-06INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • A kind of mncoge-based ferromagnetic martensitic phase change material and its preparation method and application
  • A kind of mncoge-based ferromagnetic martensitic phase change material and its preparation method and application
  • A kind of mncoge-based ferromagnetic martensitic phase change material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

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

Patent Timeline
06 Jun 2017
Publication
CN104630568B
IPC
C22C19/07; C22B4/06; H01F1/047
Inventors
包立夫; 胡凤霞