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Single-crystal-like heterojunction room-temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature zone and preparation process thereof

A kind of magnetic refrigeration material, single crystal-like technology, applied in the direction of magnetic material, polycrystalline material growth, single crystal growth, etc., can solve the problems of high processing cost of magnetic working medium, difficult processing, unfavorable popularization of magnetic refrigeration technology, etc. Actual cooling power and efficiency, effect of wide operating temperature range

Active Publication Date: 2019-12-10
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, almost all magnetic refrigeration materials are hard and brittle intermetallic compounds, which are difficult to process and make the processing cost of magnetic working fluid high, which is not conducive to the popularization of magnetic refrigeration technology in the future.

Method used

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  • Single-crystal-like heterojunction room-temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature zone and preparation process thereof
  • Single-crystal-like heterojunction room-temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature zone and preparation process thereof
  • Single-crystal-like heterojunction room-temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature zone and preparation process thereof

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0021] Example 1. Using 99.99% of Mn and Fe blocks, 99.9999% of red P and 99.999% of Ge blocks and Sn balls as raw materials, according to Mn 1.15 Fe 0.85 P 0.74 Ge 0.26 sn 12 The formula is batched, mixed and loaded with Al 2 o 3 The crucible was sealed in a quartz tube filled with Ar gas. Put the sealed quartz tube into the muffle furnace, heat it from room temperature to 1173K and keep it warm for 7 days, then slowly cool down to 573K at a cooling rate of 5K / h, then take out the quartz tube from the muffle furnace and pour the molten metal upside down Sn, filtered through quartz wool until completely cooled. The quasi-single crystal wrapped by Sn was taken out and soaked in a dilute hydrochloric acid solution with a concentration of 10% (mass fraction) for 1 to 2 weeks, then the solution was filtered off and the separated quasi-singl...

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Abstract

The invention relates to a Mn5Ge3 / (Mn, Fe)5Ge3 single-crystal-like heterojunction room-temperature magnetic refrigeration material with large magnetic entropy change and a wide working temperature zone and a preparation process thereof. Elementary substances Mn, Fe, P, Ge and Sn used as raw materials are mixed according to the component proportion of Mn<2-x>Fe<x>P<1-y>Ge<y>Sn12 (x is greater thanor equal to 0.80 and smaller than or equal to 0.90, and y is greater than or equal to 0.20 and smaller than or equal to 0.26) and packaged in a quartz tube filled with Ar gas. A needle-shaped Mn5Ge3 / (Mn, Fe)5Ge3 single-crystal-like heterojunction room-temperature magnetic refrigeration material with the diameter of about 100-300 microns and the maximum length of 1cm is successfully prepared for the first time through the processes of high-temperature heat preservation, slow cooling, molten metal Sn pouring, acid pickling separation and the like. The room-temperature magnetic refrigeration material has the advantages of large magnetic entropy change, wide working temperature zone, large refrigeration capacity, no need of subsequent processing, acid corrosion resistance and the like, and canbe directly used as a room-temperature magnetic refrigeration working medium.

Description

technical field [0001] The invention relates to a magnetic refrigeration material and a preparation process thereof. Background technique [0002] Magnetic refrigeration is a green and environmentally friendly refrigeration technology. Its basic principle is: use magnetic materials as refrigerants, use isothermal magnetization to release heat, and adiabatic demagnetization to absorb heat for refrigeration, that is, to build a Carnot cycle model based on the magnetocaloric effect. to achieve cooling effect. It has the advantages of high efficiency, energy saving, high reliability, no greenhouse effect and no damage to the ozone layer, and is expected to replace the traditional gas compression refrigeration technology. It is of great significance to the sustainable and coordinated development of human society and the environment / nature. [0003] In recent years, magnetic refrigeration materials based on the room temperature magnetocaloric effect have been extensively researc...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/02C30B29/52C30B11/02C22C1/02C22C13/00
CPCC22C1/02C22C13/00C30B11/02C30B29/52H01F1/015H01F41/0253
Inventor 刘丹敏王少博梁允田徐国梁张振路
Owner BEIJING UNIV OF TECH
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