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A magnetic cold storage material

A cold storage material and magnetic technology, applied in the field of magnetic cold storage materials, can solve the problems of reducing the specific heat of lead and reducing the efficiency of the cold accumulator, and achieve the effect of high specific heat peak value and wide coverage temperature range.

Active Publication Date: 2017-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the low temperature region below 15K, the specific heat of lead decreases sharply with the decrease of temperature, so that the efficiency of the cold storage is greatly reduced

Method used

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  • A magnetic cold storage material
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Experimental program
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Embodiment 1

[0023] Prepare HoCu according to the prescribed stoichiometric ratio 1.9 Ni 0.1 , the ingot is prepared by melting in an intermediate frequency induction heating furnace, and then processed into spherical particles by centrifugal atomization equipment.

Embodiment 2

[0025] Prepare HoCu according to the prescribed stoichiometric ratio 1.7 Ni 0.3 , the ingot was prepared by melting in an intermediate frequency induction heating furnace, and then spherical particles were prepared by a rotating electrode method.

Embodiment 3

[0027] Prepare HoCu according to the prescribed stoichiometric ratio 1.5 Ni 0.5 , the medium frequency induction heating furnace is used to prepare ingots, which are directly mechanically crushed into particles, and the particles with a size of 0.154~0.3mm are screened, which can be directly used as regenerator fillers.

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Abstract

The invention provides a HoCu2-xNix series magnetic cold storage material for cryogenic refrigerators. The magnetic cold storage material has a large volume specific heat in the 10-40K temperature range, and the specific heat peak width is large, and can replace Pb as a 10 ‑40K temperature zone cold storage material. The remarkable feature of HoCu2‑xNix series magnetic cold storage materials is that the specific heat peak position and peak size can be adjusted by controlling the content of Ni. When the addition ratio of Ni is x=0.4, the specific heat peak of the material appears at 20.2K, It is 0.95J / cm3K. HoCu2‑xNix series magnetic cold storage materials can be directly processed into granular materials by mechanical crushing method, or can be processed into spherical granular materials by melt atomization method or rotating electrode method. The best use form is 0.154 ~0.30mm spherical particles.

Description

technical field [0001] The invention relates to a magnetic cold storage material for a cryogenic refrigerator. The specific heat characteristic of the series of magnetic cold storage materials can be adjusted in a temperature range of 10K to 40K, and can be used as a cold storage material instead of metal Pb. Background technique [0002] With the rapid development of science and technology, the demand for various small and high-efficiency low-temperature refrigerators is increasing day by day. Among them, the small cold-storage gas refrigerator using helium as the working medium has been widely used in various cutting-edge technical fields due to its reliable performance and simple structure. For small cold-storage gas refrigerators, the cold storage is the key component. The performance of cold storage materials has a direct impact on the performance of the refrigerator, which ultimately determines the cooling efficiency and the lowest possible cooling temperature. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/06B22F9/10B22F9/04
Inventor 叶荣昌贾远航龙毅
Owner UNIV OF SCI & TECH BEIJING
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