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Room temperature magnetic refrigeration alloy material and preparation method therefor

An alloy material and magnetic refrigeration technology, applied in the field of metallurgy, can solve the problems of high Curie temperature, large thermal hysteresis, small adjustable temperature width, etc., and achieve the effects of small thermal hysteresis, large adjustable temperature area and simple preparation.

Active Publication Date: 2016-03-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a room temperature magnetic refrigeration alloy material and its preparation method. Large thermal hysteresis, too high or too low Curie temperature, technical problems with small adjustable temperature width

Method used

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  • Room temperature magnetic refrigeration alloy material and preparation method therefor
  • Room temperature magnetic refrigeration alloy material and preparation method therefor
  • Room temperature magnetic refrigeration alloy material and preparation method therefor

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Embodiment 1

[0024] The purity of the raw materials used is 99.9% Mn, 99.95% Al, 99.9% Co, 99.99% Ge, each powder is weighed according to the mass percentage, the mass percentage of the manganese element is 33.3-34.4%, and the mass percentage of the aluminum element is 0.6-2.7% %, the mass percentage of cobalt element is 32.8-33.3%, and the mass percentage of germanium element is 30.2-32.7%.

[0025] The alloy is smelted in a vacuum electric arc furnace, and various elements are added into the vacuum electric arc furnace. Before the alloy is smelted, the mechanical pump is first used to evacuate the vacuum below 5Pa, and the molecular pump is turned on to evacuate again to below 10 Pa. -4Pa, inject high-purity argon gas (99.999%) with a pressure of 10Pa, repeat the above vacuum pumping and gas washing operation steps twice, use a current of about 30A to start a fire, move the electrode to the top of the sample and about 0.5cm away from the sample, and slowly The current is adjusted to abou...

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Abstract

The invention discloses a room temperature magnetic refrigeration alloy material. The room temperature magnetic refrigeration alloy material is represented by the molecular formula of Mn1-XAlXCoGe; and the alloy material comprises 33.3-34.4% of manganese element, 0.6-2.7% of aluminum element, 32.8-33.3% of cobalt element, and 30.2-32.7% of germanium element in percentage by mass. The invention also provides a preparation method for the room temperature magnetic refrigeration alloy material. The preparation method comprises the steps of adding reactive materials into a vacuum arc furnace, vacuumizing until the pressure is lower than 10<-4>Pa, and pumping argon gas in; smelting the sample repeatedly; and taking out the sample and cooling the sample, putting the sample into a high-temperature-resistant quartz glass tube, vacuumizing, inflating the high-temperature-resistant quartz glass tube with high-purity argon for performing gas washing, then putting the high-temperature-resistant quartz glass tube into a furnace type box, taking the sample out and performing annealing to obtain the room temperature magnetic refrigeration alloy material. According to the preparation method, the Curie temperature of the alloy is obviously reduced to the temperature close to the room temperature, the thermal hysteresis phenomenon occurring close to phase change is effectively avoided, and a relatively wide adjustable temperature range close to the room temperature is obtained.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to an alloy magnetocaloric material in the magnetic refrigeration field, in particular to a room temperature magnetic refrigeration alloy material and a preparation method thereof. Background technique [0002] With the massive consumption of traditional energy and the pressure of environmental protection, it is imminent to develop new energy such as magnetic refrigeration. Compared with traditional gas compression refrigeration, magnetic refrigeration has the advantages 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 important way for human beings to solve energy and environmental problems. However, compared with other refrigeration methods, the technology of magnetic refrigeration is not yet mature, especially the research on magnetic refrigeration at room t...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/00C22C30/00C22C1/02C22F1/02
CPCC22C1/02C22C19/07C22C22/00C22C30/00C22F1/02H01F1/015H01F41/00
Inventor 刘永生司晓东雷伟徐娟杜文龙王玟苈卢晓飞李钊明高湉
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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