Manganese-cobalt-germanium-base alloy magnetic refrigeration material and preparing method thereof

A technology of magnetic refrigeration materials and base alloys, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effect of easy implementation, wide application prospects and avoiding thermal hysteresis problems.

Active Publication Date: 2016-06-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the in-depth research on MnCoGe alloys, it is possible to prepare the second-order phase transformation with giant magnetocaloric effect at near room temperature. Although there are many studies on MnCoGe-based alloys at home and abroad, there is still a lack of research on Ge-site doping of MnCoGe-based alloys.

Method used

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  • Manganese-cobalt-germanium-base alloy magnetic refrigeration material and preparing method thereof
  • Manganese-cobalt-germanium-base alloy magnetic refrigeration material and preparing method thereof
  • Manganese-cobalt-germanium-base alloy magnetic refrigeration material and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] According to the molar ratio of 1:1:0.99:0.01, the purity of 99.9% Mn, 99.9% Co, 99.99% Ge, and 99.9% Cu is weighed and placed in a vacuum electric arc furnace for melting. Below 5Pa, turn on the molecular pump to evacuate again to below 10 -4 Pa, pass high-purity argon gas (99.999%) with a pressure of 10Pa, repeat the above operation steps twice, start a fire with a current of 30A, the distance between the electrode and the sample is about 0.5cm, slowly adjust the current to 80A until the sample is completely melted, and then Reduce the current to 60A and smelt for half a minute, wait for the alloy to cool and turn it over, and repeat the smelting four times to ensure that the samples are evenly mixed. Take out the cooled sample and put it into a high-purity high-temperature-resistant quartz glass test tube, use a high-vacuum molecular pump system to evacuate to less than 5Pa, fill it with high-purity argon (99.999%) for washing, repeat the above steps three times, sea...

Embodiment 2

[0028] All are the same except that the molar addition ratio between Mn, Co, Ge and Cu is 1:1:0.98:0.02.

Embodiment 3

[0030] All are the same except that the molar addition ratio between Mn, Co, Ge and Cu is 1:1:0.97:0.03.

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Abstract

The invention relates to a manganese-cobalt-germanium-base alloy magnetic refrigeration material and a preparing method thereof. The molecule general formula of the magnetic refrigeration material is MnCoGe1-xCux, wherein the value of x ranges from 0.005 to 0.05. The manganese-cobalt-germanium-base alloy magnetic refrigeration material is prepared by the following steps that firstly, a manganese material, a cobalt material, a germanium material and a copper material are weighed according to the molar ratio of 1:1:(1-x): x, heating, fusing and even mixing are conducted under the inert gas shielding, and a mixed sample is obtained; and secondly, the mixed sample is taken out, annealing treatment is conducted, and a target product is obtained. Compared with the prior art, the magnetic refrigeration material has the beneficial effects that the magnetic refrigeration material is good in Curie temperature and magnetocaloric effect, the magnetic refrigeration material is a second-order phase change material, the problem of heat stagnation brought by a first-order phase change material is effectively solved, and preparing is simple and feasible.

Description

technical field [0001] The invention relates to an alloy magnetic refrigeration material in the field of magnetic refrigeration, in particular to a manganese-cobalt-germanium-copper alloy magnetic refrigeration material and its preparation. Background technique [0002] At present, the development of magnetic refrigeration at room temperature is at a low ebb. The reason is that its thermal hysteresis and magnetic hysteresis are large, the adjustable temperature width and cooling capacity are small, and the cost is too high; and with the large consumption of traditional energy and the environmental protection The development of new energy sources such as magnetic refrigeration is imminent. Compared with traditional gas compression refrigeration, magnetic refrigeration has the characteristics of high efficiency, low noise, small footprint and no pollution during use. Realizing refrigeration through the magnetocaloric effect of magnetic materials will inevitably become an impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/02C22F1/16C09K5/14
CPCC09K5/14C22C1/02C22C28/00C22C30/02C22F1/16
Inventor 刘永生司晓东王玟苈卢晓飞于文英沈毓龙徐燕孙万荣高湉
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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