Low-temperature magnetic cooling erbium-based bulk amorphous material

An amorphous material and magnetic refrigeration technology, which is applied in the field of magnetic refrigeration alloys, can solve the problems of Freon compression refrigeration and other problems, and achieve the effects of favorable energy utilization, simple preparation process, and wide applicable temperature range

Inactive Publication Date: 2010-01-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, according to the Montreal Agreement signed by the United Nations Environment Program in September 1987, the production and use of Freon will be gradually banned from 2000, which will make the widely used Freon compression refrigeration face difficulties

Method used

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  • Low-temperature magnetic cooling erbium-based bulk amorphous material
  • Low-temperature magnetic cooling erbium-based bulk amorphous material
  • Low-temperature magnetic cooling erbium-based bulk amorphous material

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Embodiment Construction

[0020] Using commercially available pure metals Er, Al, Co (purity higher than 99.5%, weight percentage) as starting materials, first arc melting in an argon atmosphere protected by oxygen absorption of titanium ingots, each alloy needs to be melted 5 times, with Ensure that the composition of the master alloy is uniform. The nominal composition (atomic percentage) of embodiment alloy is respectively Er 56 al 24 co 20 、Er 58 al 24 co 18 、Er 58 al 22 co 20 and Er 58 al 14 co 28 . Take an appropriate amount of master alloy material and place it in a copper mold with cooling water, re-melt it in an electric arc furnace under an argon atmosphere, and suck the alloy melt into the cavity of the copper mold. The cavity of the copper mold can be designed as round holes with different diameters (such as Ф2mm, Ф3mm, Ф5mm, etc.) according to the needs. Change the alloy composition to Er 58 al 24 co 18 、Er 58 al 22 co 20 、Er 58 al 14 co 28 The master alloy is cast in...

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Abstract

The invention discloses a low-temperature magnetic cooling erbium-based bulk amorphous material and belongs to the field of magnetic cooling alloys of functional materials. The low-temperature magnetic cooling erbium-based bulk amorphous material is characterized by comprising the following chemical components in percentage by atom: 55 to 65 percent of Er, 14 to 24 percent of Al and 18 to 28 percent of Co. The material can form bulk amorphous alloys under a common suction casting condition, has magnetic entropy change and magnetic cooling capability higher than those of metal Er, has a cost price lower than magnetic cooling materials such as Er-based crystalline and giant magnetic material Gd5Si2Ge2, of the same magnetic entropy change and magnetic cooling capability and is a high quality magnetic cooling material in a 2 to 50 K range.

Description

technical field [0001] The invention belongs to the field of magnetic cooling alloys in functional materials, and relates to an erbium (Er)-based bulk amorphous alloy material with large magnetic entropy change and magnetic cooling capacity. Background technique [0002] In the field of refrigeration materials, Freon is a familiar refrigerant. However, according to the Montreal Agreement signed by the United Nations Environment Program in September 1987, the production and use of Freon will be gradually banned from 2000, making the currently widely used Freon compression refrigeration face difficulties. As a high-tech green refrigeration technology, magnetic refrigeration is attracting great attention from all over the world. The basis of magnetic refrigeration is the magnetocaloric effect. The so-called magnetocaloric effect (Magnetocaloric Effect, MCE), also known as the magnetic card effect, is an inherent characteristic of magnetic materials. The research on the magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/00
Inventor 惠希东许志一安亮坤王毅王恩睿陈国良
Owner UNIV OF SCI & TECH BEIJING
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