La(fe,si)13-based magnetic refrigeration material prepared from high CE industrial pure mixed rare earth as raw material and its preparation method and application

A technology of magnetic refrigeration materials and mixed rare earths, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of increased magnitude of magnetocaloric effect and increased hysteresis loss

Active Publication Date: 2015-10-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, it was found that substituting La with small rare-earth magnetic atoms (such as Ce, Pr, Nd) can enhance the first-order phase transition properties, increase the hysteresis loss, and increase the magnitude of the magnetocaloric effect

Method used

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  • La(fe,si)13-based magnetic refrigeration material prepared from high CE industrial pure mixed rare earth as raw material and its preparation method and application
  • La(fe,si)13-based magnetic refrigeration material prepared from high CE industrial pure mixed rare earth as raw material and its preparation method and application
  • La(fe,si)13-based magnetic refrigeration material prepared from high CE industrial pure mixed rare earth as raw material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Embodiment 1: prepare La 0.7 (Ce,Pr,Nd) 0.3 Fe 11.6 Si 1.4 C y (y=0,0.1,0.2) Three kinds of magnetic refrigeration materials

specific example

[0079] This embodiment provides to prepare La by chemical formula 0.7 (Ce,Pr,Nd) 0.3 Fe 11.6 Si 1.4 C y (y=0, 0.1, 0.2) specific examples of magnetic refrigeration materials, the preparation process is:

[0080] 1) Press La 0.7 (Ce,Pr,Nd) 0.3 Fe 11.6 Si 1.4 C y (y=0, 0.1, 0.2) chemical formula ingredients, the raw materials are high Ce industrial pure mixed rare earth La-Ce-Pr-Nd, elemental Fe, elemental Si, elemental La and FeC alloy, among which, elemental La is used to supplement the mixed rare earth In the part where La is insufficient, FeC alloy is used to provide C. Since FeC alloy also contains Fe element, it is necessary to appropriately reduce the added elemental Fe, so that the ratio of various elements added still meets the atomic ratio in the chemical formula;

[0081] 2) Mix the raw materials in step 1), put them into the electric arc furnace, and evacuate to 2×10 -3 Pa, clean the furnace chamber twice with high-purity argon gas with a purity of 99.996wt...

Embodiment 2

[0089] Embodiment 2: prepare La 0.7 (Ce,Pr,Nd) 0.3 (Fe 1-x co x ) 11.6 Si 1.4 (x=0.02, 0.04, 0.06, 0.08, 0.1) Five kinds of magnetic refrigeration materials

[0090] This embodiment provides to prepare La by chemical formula 0.7 (Ce,Pr,Nd) 0.3 (Fe 1-x co x ) 11.6 Si 1.4 (x=0.02, 0.04, 0.06, 0.08, 0.1) Specific examples of magnetic refrigeration materials, the preparation process is:

[0091] 1) Press La 0.7 (Ce,Pr,Nd) 0.3 (Fe 1-x co x ) 11.6 Si 1.4(x=0.02, 0.04, 0.06, 0.08, 0.1) chemical formula ingredients, raw materials are high Ce industrial pure mixed rare earth La-Ce-Pr-Nd, and elemental Fe, elemental Co, elemental Si and elemental La, among which elemental La is used To supplement the insufficient part of La in the mixed rare earth;

[0092] 2) Mix the raw materials in step 1), put them into the electric arc furnace, and evacuate to 2×10 -3 Pa, clean the furnace chamber twice with high-purity argon gas with a purity of 99.996wt...

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Abstract

The invention provides a La(Fe,Si)13 based magnetic refrigeration material by taking high-Ce industrial pure mixed rare earth as a raw material. The chemical formula is La1-x(Ce,Pr,Nd)x(Fe1-p-qCopMnq)13-ySiyaalpha and is provided with an NaZn12 type structure. The invention further provides a preparation method and an application of the material. The preparation method comprises the following steps: smelting and annealing to prepare the La1-x(Ce,Pr,Nd)x(Fe1-p-qCopMnq)13-ySiyaalpha magnetic refrigeration material by taking the high-Ce industrial pure mixed rare earth as the raw material. Impurities in the raw material high-Ce industrial pure mixed rare earth do not influence the generation of a 1: 13 phase and the appearance of first order phase transformation and variable magnetic transition behavior, so that the dependence on a high-purity single-substance rare earth raw material is reduced, the preparation cost of the material is reduced, and the La(Fe,Si)13 based magnetic refrigeration material has important actual meanings on developing the magnetic refrigeration application of the material.

Description

technical field [0001] The invention relates to a magnetic refrigeration material, in particular to a kind of La(Fe,Si) prepared from high Ce industrial pure mixed rare earth La-Ce-Pr-Nd with huge magnetocaloric effect 13 Basic magnetic refrigeration material and its preparation method and use. Background technique [0002] Rare earths have important uses in industrial production, national defense technology and other fields, and are globally recognized as important strategic resources. my country is the country with the largest rare earth reserves. According to the 2010 statistics of the US Department of Geology and Mining, China's rare earth reserves accounted for 36.36% of the world's total reserves. As early as the 1950s, Premier Zhou Enlai included the development of rare earths in China's first scientific and technological development plan. In 1992, Deng Xiaoping also said during his southern tour: "The Middle East has oil, and China has rare earths." In recent year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14C22C38/00
Inventor 陈岭胡凤霞王晶包立夫赵莹莹沈保根孙继荣
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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