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A kind of near room temperature magnetic refrigeration manganese germanium based refrigeration material and preparation method thereof

A magnetic refrigeration, germanium-based technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem of unsatisfactory magnetocaloric effect, and achieve the effect of avoiding thermal hysteresis, optimizing Curie temperature, and optimizing magnetocaloric effect

Active Publication Date: 2022-07-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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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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  • A kind of near room temperature magnetic refrigeration manganese germanium based refrigeration material and preparation method thereof
  • A kind of near room temperature magnetic refrigeration manganese germanium based refrigeration material and preparation method thereof
  • A kind of near room temperature magnetic refrigeration manganese germanium based refrigeration material and preparation method thereof

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Embodiment 1

[0034] The purity of the experimental raw materials is 99.9%Mn, 99.99%Ge, 99.99%Ti, and the alloy is smelted by a vacuum arc furnace. 5 Ge 3-x Ti x (x are respectively 0.5, 1) The metering ratio of weighing the reaction raw materials is put into the electric arc furnace, and then the furnace is evacuated so that the degree of vacuum is lower than 10 -3 Pa, then pass in high-purity argon (99.999%) until the pressure is about 10Pa, repeat the above vacuuming and gas washing operation steps 3 times, use a current of about 30A to catch 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, and then reduce the current to 50A and smelt for half a minute. After the alloy is cooled, it is turned over, and the smelting is repeated 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 annealing furnace. The system is ...

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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 specific preparation process is as follows: (1) according to Mn 5 Ge 3‑x Ti x (Wherein, x is 0.5-1) the metering ratio of weighing manganese powder, germanium powder and titanium powder, under the protection of inert gas, heating, melting and mixing to obtain a homogenized sample; (2) taking out the homogenized sample and cooling, and then After annealing treatment, the target product is obtained. Compared with the prior art, the manganese-germanium-based refrigeration material prepared by the present invention has extremely small hysteresis loss, large magnetocaloric effect and adjustable temperature width, and at the same time, the phase transition property is second-order, and the temperature is close to room temperature (265K-290K). ) is continuously adjustable, which meets the needs of near-room temperature magnetic refrigeration technology.

Description

technical field [0001] The invention belongs to the technical field of alloy magnetocaloric materials, and relates to a near-room temperature magnetic refrigeration manganese-germanium-based refrigeration material and a preparation method thereof. Background technique [0002] At present, as the concept of protecting the environment is deeply rooted in the hearts of the people, the large consumption of traditional energy and the development of new energy sources such as magnetic refrigeration are 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 is to achieve refrigeration through the magnetocaloric effect of the magnetic material itself, which will inevitably become an important way for mankind to solve energy and environmental problems. However, as far as the current technological development is concerned,...

Claims

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Application Information

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Patent Type & Authority Patents(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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