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Mn-Fe-P-Si magnetic refrigeration material and preparation method thereof

A technology of mn-fe-p-si and magnetic refrigeration materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of active powder chemical properties, increased raw material costs, easy oxidation, etc., to achieve low price, The effect of low cost and large magnetic entropy

Inactive Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

[0004] Most of the existing MnFePSi series alloys are prepared by ball milling-sintering process or rapid solidification technology, both of which need to use high-purity elemental powder as raw material, which not only greatly increases the cost of raw materials, but also has chemical The problem of active nature and easy oxidation

Method used

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  • Mn-Fe-P-Si magnetic refrigeration material and preparation method thereof
  • Mn-Fe-P-Si magnetic refrigeration material and preparation method thereof
  • Mn-Fe-P-Si magnetic refrigeration material and preparation method thereof

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Embodiment 1

[0039] A kind of Mn-Fe-P-Si magnetic refrigeration material, its preparation method is as follows:

[0040] (1) Press Mn sheet, Fe block, FeP block, Si block and B block by Mn 1.15 Fe0.85 P 0.52 Si 0.45 B 0.03 The atomic proportions of the alloy. Among them, the masses of Mn sheet, Fe block, FeP block, Si block and B block are 4.758g, 0.287g, 4.439g, 0.906g, 0.023g respectively, and four parts are weighed;

[0041] (2) Put the prepared raw materials into the vacuum electric arc furnace and evacuate to 5×10 -3 Below Pa, fill it with high-purity argon gas of 0.03-0.05MPa, and use arc melting to make alloy ingots. In order to ensure that the components are mixed evenly, the sample is turned over after each melting, and the melting is repeated 5 times;

[0042] (3) After the alloy ingot described in the step (2) is removed from the surface oxide skin, it is crushed, and 5 g of the alloy ingot is taken and loaded into a quartz tube having a small hole at the lower end. Insta...

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Abstract

The invention belongs to the field of magnetic refrigeration materials, and discloses an Mn-Fe-P-Si magnetic refrigeration material and a preparation method thereof. The material composition is selectively Mn1.15Fe0.85P0.52Si0.45B0.03. The preparation method comprises the following steps: (1) mixing Mn sheets, Fe blocks, FeP blocks, Si blocks and B blocks after weighing according to the mass percentages of elements in a chemical formula, wherein 5% of balance is added to the Mn; (2) putting raw materials prepared in the step (1) into a vacuum electric arc furnace, and utilizing high-purity argon gas shield for smelting to obtain an alloy pig; (3) breaking up the alloy pig, putting into a vacuum rapid quenching furnace for smelting alloy, and carrying out copper mold casting; (4) sealing the copper mold casting alloy into a quartz tube, vacuumizing to below 10<-4> Pa, carrying out annealing treatment, and then rapidly quenching into cold water to obtain the magnetic refrigeration material. The mn-Fe-P-Si magnetic refrigeration material is simple in technology, low in cost, and the magnetic refrigeration material with high density and excellent magnetocaloric effect can be obtained.

Description

technical field [0001] The invention belongs to the field of preparation of magnetic refrigeration materials, and in particular relates to a Mn-Fe-P-Si magnetic refrigeration material and a preparation method thereof. Background technique [0002] Magnetic refrigeration technology is a brand-new refrigeration technology that uses magnetic materials as working fluids and uses the change of magnetic entropy of the spin system to realize refrigeration. Compared with compression refrigeration technology, magnetic refrigeration technology has many advantages such as compact structure, high efficiency and energy saving, and no environmental pollution, and is becoming a hot research topic for current scientific researchers. Magnetic refrigeration technology has broad application prospects in the fields of refrigerators, air conditioners and large-scale food freezing. However, if the magnetic refrigeration technology can be realized, there are still many problems to be solved, incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C09K5/14
Inventor 余红雅朱忠仁郑志刚曾德长钟喜春刘仲武
Owner SOUTH CHINA UNIV OF TECH
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