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Rare earth doped oxysulfide - HoCu2 ceramic-metal composite magnetic cold-storage material

A technology of rare earth sulfur oxides and cold storage materials, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of narrow effective working temperature range, achieve widened temperature range, high specific heat peak value, and improved cold storage performance Effect

Inactive Publication Date: 2008-10-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide the rare earth sulfur oxide-HoCu with large specific heat in the temperature range of 3~10K 2 Ceramic-metal composite magnetic regenerator material, to change the defect of narrow effective working temperature range of the current single magnetic regenerator material, which is conducive to the simplification of the regenerator structure

Method used

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  • Rare earth doped oxysulfide - HoCu2 ceramic-metal composite magnetic cold-storage material
  • Rare earth doped oxysulfide - HoCu2 ceramic-metal composite magnetic cold-storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Will Gd 2 o2 S and HoCu2 are mixed in a ratio of 65wt%: 35wt%, stainless steel balls are used, and absolute ethanol is used as the ball milling medium. When the mass ratio of the ball to material is 12:1, the powder with an average particle size of 2.043um can be obtained by ball milling for 4 hours. After vacuum drying, Using spark plasma sintering, the sintering pressure is 40MPa, the sintering temperature is 1100℃, and the sintering time is 5min, the Gd can be obtained 2 o 2 S-HoCu 2 Ceramic-metal composite magnetic cold storage material.

Embodiment 2

[0026] Will Tb 2 o 2 S and HoCu 2 Mix at a ratio of 50wt%: 50wt%, use alumina ceramic balls, and use absolute ethanol as the ball milling medium. When the mass ratio of the ball to material is 8:1, the powder with an average particle size of 2.454um can be obtained by ball milling for 3 hours. After vacuum drying, use Spark plasma sintering, sintering pressure 40MPa, sintering temperature 1100°C, sintering time 5min, Tb can be obtained 2 o 2 S-HoCu 2 Ceramic-metal composite magnetic cold storage material.

Embodiment 3

[0028] Will Dy 2 o 2 S and HoCu 2 Mix at a ratio of 60wt%: 40wt%, use silicon nitride balls, and use absolute ethanol as the ball milling medium. When the mass ratio of the ball to the material is 9:1, the powder with an average particle size of 1.888um can be obtained by ball milling for 6 hours. After vacuum drying, use Spark plasma sintering, sintering pressure 40MPa, sintering temperature 1100 ℃, sintering time 5min, that is to get Dy 2 o 2 S-HoCu 2 Ceramic-metal composite magnetic cold storage material.

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Abstract

The present invention belongs to function material field, relating to a rare earth oxysulfide-HoCu2 composite magnetic regenerator material, the regenerator material has a higher specific heat in 3-10K temperature range, beneficial to simplify the structure of regenerator, characterized in that the ratio of the composite magnetic regenerator material is based on Wt %, let the ration of rare earth doped oxysulfide is x, the ratio of HoCu2 is 1-x, the change range x of the rare earth doped oxysulfide ration is 30-70%, the specific process includes following steps: firstly, according to the ratio, weighing rare earth doped oxysulfide and HoCu2 two powder to place in a spheroidal miller, then adding a grinding ball and a milling medium, then adequately milling after sealed, then, filtering, drying the milled material, finally, pressing forming and processing sintering treatment, obtaining the rare earth oxysulfide-HoCu2 composite magnetic regenerator material. The composition of the rare earth oxysulfide magnetic regenerator material and HoCu2 avoids the problem of decomposition of the rare earth oxysulfide caused by the sintering in a high temperature. The cool storage ability of the new type magnetic regenerator material obtained after being combined is greatly improved.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a ceramic-metal composite magnetic regenerator material for ultra-low temperature refrigerators. The regenerator material has a large specific heat in the temperature range of 3-10K, and is beneficial to realize the simplification of the regenerator structure. Background technique [0002] With the rapid development of science and technology, the scope and field of application of cryogenic technology are constantly expanding, and the demand for various small and high-efficiency cryogenic refrigerators is increasing day by day. Among them, small cold-storage gas refrigerators using helium as a working medium, such as Gifford-McMahon refrigerators or Stirling cycle refrigerators, have been widely used in various cutting-edge technical fields due to their reliable performance and simple structure. [0003] For small cold-storage gas refrigerators, cold storage is a key component. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
Inventor 叶荣昌龙毅张波
Owner UNIV OF SCI & TECH BEIJING
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