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A kind of single crystal heterojunction room temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature range and its preparation process

A magnetic refrigeration material and single crystal-like technology, which is applied in the directions of magnetic materials, polycrystalline material growth, single crystal growth, etc., can solve the problems of unfavorable magnetic refrigeration technology popularization, difficult processing, high processing cost of magnetic working medium, etc.

Active Publication Date: 2021-09-10
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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  • A kind of single crystal heterojunction room temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature range and its preparation process
  • A kind of single crystal heterojunction room temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature range and its preparation process
  • A kind of single crystal heterojunction room temperature magnetic refrigeration material with large magnetic entropy change and wide working temperature range and its preparation process

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Embodiment Construction

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0021] Example 1. 99.99% MN and FE block, 99.999% red P and 99.999% of GE block and SN ball are raw materials, according to MN 1.15 FE 0.85 P 0.74 GE 0.26 SN 12 The formula is ingredient, mixed after mixing Al 2 O 3 The crucible is also sealed in the quartz tube charged in Ar gas. Put the sealed quartz pipe into the muffle furnace, heated from room temperature to 1173K and heat insulation for 7 days, then slowly cools down to 573k with a cooling rate of 5 k / h, then removes the quartz pipe inverted molten metal from the muffle furnace Sn, fully filtered through quartz cotton to completely cool. Take out the dilute hydrochloric acid solution of the Sn-wrapped single crystal to the dilute hydrochloric acid solution in the concentration of 10% (mass fraction), then filtered off the solution and cleaned with distilled water and alcohol to separate the sep...

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Abstract

The invention relates to a Mn with large magnetic entropy change and wide working temperature range 5 Ge 3 / (Mn,Fe) 5 Ge 3 Single crystal-like heterojunction room temperature magnetic refrigeration material and its preparation process. Using elemental Mn, Fe, P, Ge and Sn as raw materials, according to Mn 2‑x Fe x P 1‑y Ge y sn 12 (0.80≤x≤0.90,0.20≤y≤0.26) The raw materials are mixed and packaged in a quartz tube filled with Ar gas. After high temperature insulation, slow cooling, pouring of molten metal Sn and pickling separation, etc., For the first time, acicular Mn with a diameter of about 100-300 μm and a length of up to 1 cm was successfully prepared. 5 Ge 3 / (Mn,Fe) 5 Ge 3 Single crystal heterojunction room temperature magnetic refrigeration material. The room temperature magnetic refrigeration material has the advantages of large magnetic entropy change, wide working temperature range, large refrigeration capacity, no need for subsequent processing and acid corrosion resistance, and can be directly used as a room temperature magnetic refrigeration working medium.

Description

Technical field [0001] The present invention relates to a magnetic refrigeration material and a preparation process thereof. Background technique [0002] Magnetic cold is a green environmental refrigeration technology. The basic principle is that the magnetic material is used as a refrigeration process, and is refrigerated by means of an isothermal magnetization and heat absorbing, that is, the magnetic heat effect is based on the magnetic heat effect. To achieve the effect of refrigeration. It has the advantages of efficient energy saving, high reliability, and no greenhouse effects and destroying ozone layers, which are expected to replace the conventional gas compression refrigeration technology. It is of great significance for the sustainable coordination of human society and the environment / nature. [0003] In recent years, magnetic refrigeration materials based on room temperature magnetic heat effect have been widely studied and rapidly developed. At present, the most r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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