Near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and preparation method thereof

A magnetic refrigeration and room temperature technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of unsatisfactory magnetocaloric effect, achieve the optimization of Curie temperature and magnetocaloric effect, avoid thermal hysteresis, and low price Effect

Active Publication Date: 2021-01-15
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to limitations such as preparation methods and raw material purity, the current Mn 5 Ge 3 The magnetocaloric effect near room temperature is still not ideal

Method used

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  • Near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and preparation method thereof
  • Near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and preparation method thereof
  • Near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and preparation method thereof

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Experimental program
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Embodiment 1

[0034] The purity of the experimental raw materials used is 99.9% Mn, 99.99% Ge, 99.99% Ti, and the alloy is smelted in a vacuum electric arc furnace. Specifically, before the alloy is smelted, the Mn 5 Ge 3-x Ti x (x is respectively 0.5, 1) metering ratio Weigh the reaction raw material and put it into the electric arc furnace, then the furnace is evacuated so that the vacuum degree is lower than 10 -3 Pa, then pass high-purity argon gas (99.999%) to the pressure of about 10Pa, repeat the above vacuuming and washing operation steps 3 times, use a current of about 30A to start a fire, move the electrode to the top of the sample and adjust the current to 70A Left and right until the sample is completely melted, then reduce the current to 50A for half a minute, wait for the alloy to cool and turn it over, and repeat the melting 4 times to ensure the uniformity of the sample. Take out the cooled sample and put it into a high-temperature quartz glass test tube in a vacuum anneal...

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Abstract

The invention relates to a near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and a preparation method thereof. The preparation method specifically comprisesthe steps that (1) manganese powder, germanium powder and titanium powder are weighed according to the stoichiometric ratio of Mn5Ge<3-x>Ti<x> (wherein x is 0.5 to 1) and heated, melted and mixed under the protection of inert gas, and a homogenized sample is obtained; and (2) the homogenized sample is taken out, cooled and annealed to obtain the target product. Compared with the prior art, the near-room-temperature magnetic refrigeration manganese-germanium-based refrigeration material and the preparation method thereof have the advantages that the manganese-germanium-based refrigeration material prepared by the preparation method disclosed by the invention has extremely small hysteresis loss, relatively large magnetocaloric effect and adjustable temperature width, meanwhile, the phase change property is secondary and is continuously adjustable at a near room temperature (265K-290K), so that the requirements of a near room temperature magnetic refrigeration technology are met.

Description

technical field [0001] The invention belongs to the technical field of alloy magnetocaloric materials, and relates to a manganese-germanium-based refrigeration material for magnetic refrigeration near room temperature and a preparation method thereof. Background technique [0002] At present, with the concept of protecting the environment deeply rooted in the hearts of the people, and the massive consumption of traditional energy sources, the development of new energy sources such as magnetic refrigeration is imminent. Compared with traditional gas compression refrigeration, magnetic refrigeration has the advantages of high efficiency, low noise, small footprint and no pollution during use. Magnetic refrigeration technology realizes refrigeration through the magnetocaloric effect of the magnetic material itself, which will inevitably become an important way for human beings to solve energy and environmental problems. However, as far as the current technological development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C22/00C22C1/02C22F1/02C22F1/16C21D1/26H01F1/01
CPCC22C22/00C22C1/02C22F1/02C22F1/16C21D1/26H01F1/015C22C2202/02Y02B30/00
Inventor 刘永生钱玥彤武孟陈炜于文英武新芳孙万荣林佳罗晓婧
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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