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A room temperature magnetic refrigeration alloy magnetocaloric material and its preparation method and application

A magnetocaloric material and magnetic refrigeration technology, applied in the field of metallurgy, can solve the problems of high Curie temperature, prominent thermal hysteresis problem, small adjustable temperature width, etc. simple effect

Active Publication Date: 2018-08-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a room temperature magnetic refrigeration alloy magnetocaloric material and its preparation method and application in order to overcome the defects in the above-mentioned prior art, so as to solve the outstanding thermal hysteresis problem existing in the MnCoGe-based alloy material in the prior art, Curie The technical defect that the temperature is too high or too low, and the adjustable temperature width is small

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  • A room temperature magnetic refrigeration alloy magnetocaloric material and its preparation method and application
  • A room temperature magnetic refrigeration alloy magnetocaloric material and its preparation method and application
  • A room temperature magnetic refrigeration alloy magnetocaloric material and its preparation method and application

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Embodiment 1

[0034] The purity of the raw materials used is 99.9% Mn, 99.9% Co, 99.99% Ti, 99.99% Ge, each powder is weighed according to the molar atomic percentage, the atomic percentage of the manganese element is 33.3-34.4%, and the atomic percentage of the cobalt element is 32.8- 33.3%, the atomic percentage of titanium element is 0.6-2.7%, and the atomic percentage of germanium element is 30.2-32.7%.

[0035] The alloy is smelted in a vacuum electric arc furnace, and the weighed high-purity powder mixture is added to the vacuum electric arc furnace. Before the alloy is smelted, firstly use a mechanical pump to evacuate the vacuum below 5Pa, and turn on the molecular pump to evacuate again to below 10 Pa. -4 Pa, 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 c...

Embodiment 2

[0048] The room temperature magnetic refrigeration alloy magnetocaloric material of this embodiment, the chemical general formula of this material is MnCo 1-x Ti x Ge, where x is 0.02, the atomic percentage of manganese element in the material is 33.3%, the atomic percentage of cobalt element is 32.8%, the atomic percentage of titanium element is 1.2%, and the atomic percentage of germanium element is 32.7%.

[0049] The Curie temperature of the material in this example is raised from 273.5K to 284K, and under a magnetic field change of 5T, the maximum magnetic entropy becomes 3.16J kg -1 K -1 ,3.30J·kg -1 K -1 ,3.28J·kg -1 K -1 ,3.25J·kg -1 K -1 .

[0050] The preparation method of the room temperature magnetic refrigeration alloy magnetocaloric material in this embodiment specifically includes the following steps:

[0051] Step (1): Weighing manganese powder, cobalt powder, titanium powder and germanium powder according to molar atomic percentage, and mixing them un...

Embodiment 3

[0062] The room temperature magnetic refrigeration alloy magnetocaloric material of this embodiment, the chemical general formula of this material is MnCo 1-x Ti x Ge, where x is 0.05, the atomic percentage of manganese element in the material is 34.4%, the atomic percentage of cobalt element is 33.3%, the atomic percentage of titanium element is 2.1%, and the atomic percentage of germanium element is 30.2%.

[0063] The Curie temperature of the material in this example is raised from 273.5K to 284K, and under a magnetic field change of 5T, the maximum magnetic entropy becomes 3.16J kg -1 K -1 ,3.30J·kg -1 K -1 ,3.28J·kg -1 K -1 ,3.25J·kg -1 K -1 .

[0064] The preparation method of the room temperature magnetic refrigeration alloy magnetocaloric material in this embodiment specifically includes the following steps:

[0065] Step (1): Weighing manganese powder, cobalt powder, titanium powder and germanium powder according to molar atomic percentage, and mixing them un...

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Abstract

The invention relates to an alloy magnetocaloric material for magnetic refrigeration at a room temperature as well as a preparation method and application thereof. A chemical general formula of the material is MnCo1-xTixGe, wherein x is 0.02 to 0.08; the atomic percentage of a manganese element in the material is 33.3 to 34.4 percent; the atomic percentage of a cobalt element is 32.8 to 33.3 percent; the atomic percentage of a titanium element is 0.6 to 2.7 percent; and the atomic percentage of a germanium element is 30.2 to 32.7 percent. During preparation, reactants are added into a vacuum electric arc furnace; the vacuum electric arc furnace is vacuumized to 10<4> Pa or below, and high-purity argon gas is introduced; samples are melted for 2 to 5 times repeatedly; samples are taken out and cooled, and then put into a high-temperature resistant quartz glass test tube for vacuumizing; the high-purity argon gas is introduced to clean the gas and then put into a furnace type box; and the samples are taken out and annealed to obtain a finished product. Compared with the prior art, the alloy magnetocaloric material disclosed by the invention is a secondary phase change material, and has the characteristics of small heat stagnation and large regulated temperature zones; moreover, the problem of the heat stagnation caused by a primary phase change material can be effectively avoided; and a preparation process has simple steps, the condition controllability is good, and the material has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a room-temperature magnetic refrigeration alloy magnetocaloric material and a preparation method and application 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 the magnetic material itself will inevitably become It is 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 temperature has just started, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16H01F1/01H01F41/02
CPCC22C1/02C22C30/00C22C2202/02C22F1/16H01F1/015H01F41/02
Inventor 刘永生于文英沈毓龙马新秀张占先司晓东徐燕孙万荣陈世杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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