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Thulium-nickel material for magnetic refrigeration and preparation method thereof

A magnetic refrigeration and rhomboid technology, which is applied in the fields of magnetic materials, inorganic material magnetism, metal material coating technology, etc.

Active Publication Date: 2021-09-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of commercial application of magnetic refrigeration materials in extremely low temperature regions and low magnetic field changes

Method used

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  • Thulium-nickel material for magnetic refrigeration and preparation method thereof
  • Thulium-nickel material for magnetic refrigeration and preparation method thereof
  • Thulium-nickel material for magnetic refrigeration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example is used to illustrate Tm 2.97 Ni 2.02 Materials and their preparation methods.

[0047] T m 2.97 Ni 2.02 The preparation method comprises the following steps:

[0048]Step S1: Mix the powdered metal Tm and Ni raw materials according to the ratio of the molecular formula, wherein the amount of the raw material Ni is weighed according to the chemical formula, and the amount of the raw material Tm is weighed according to the excess ratio of the chemical formula, and the excess ratio 2%, the powder particle size is 50μm, and the raw material purity is 99.99%;

[0049] Step S2: Put the raw materials mixed in step S1 into a mold of a tablet machine, and press into tablets. Wherein, the inner diameter of the mold is 1 cm, the applied pressure is 10 MPa, and rests for 3-5 minutes after the tableting process, so that the raw materials in the sheet sample are fully contacted;

[0050] Step S3: Vacuum annealing is performed on the flake sample obtained in step S...

Embodiment 2

[0062] This example is used to illustrate Tm 3.02 Ni 1.96 Materials and their preparation methods.

[0063] T m 3.02 Ni 1.96 The preparation method comprises the following steps:

[0064] Step S1: Mix the powdered metal Tm and Ni raw materials according to the ratio of the molecular formula, wherein the amount of the raw material Ni is weighed according to the chemical formula, and the amount of the raw material Tm is weighed according to the excess ratio of the chemical formula, and the excess ratio 2%, the powder particle size is 50μm, and the raw material purity is 99.99%;

[0065] Step S2: Put the raw materials mixed in step S1 into a mold of a tablet machine, and press into tablets. Wherein, the inner diameter of the mold is 1cm, the applied pressure is 10Mpa, and rests for 3-5 minutes after the tableting treatment, so that the raw materials in the sheet sample are fully contacted;

[0066] Step S3: Vacuum annealing is performed on the flake sample obtained in step ...

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Abstract

The invention discloses a thulium-nickel material for magnetic refrigeration and a preparation method thereof. The chemical formula of the thulium-nickel material is Tm < 3 + > xNi < 2 + > y, x is larger than or equal to-0.1 and smaller than or equal to 0.1, y is larger than or equal to-0.1 and smaller than or equal to 0.1, the thulium-nickel material has a rhombohedral crystal structure, the space group of the crystal structure is R-3, the phase change temperature ranges from 2 K to 6 K, and a magnetic entropy change peak value under 0-2 T magnetic field change ranges from 15 J / (kg.K) to 17 J / (kg.K). The adopted preparation method comprises the modes of tabletting, crushing, grinding and the like and is clean and environmentally friendly, and the obtained thulium-nickel material can be used for the magnetic refrigeration in an extremely low temperature area and a low magnetic field.

Description

technical field [0001] The invention belongs to the field of magnetic refrigeration, in particular to a thulium-nickel material used for magnetic refrigeration and a preparation method thereof. Background technique [0002] Modern society is increasingly inseparable from refrigeration technology, from people's daily life to industrial and agricultural production, medical and health, national defense technology, etc. At present, gas compression refrigeration technology is generally used to achieve refrigeration, but traditional gas compression refrigeration technology also has problems such as high energy consumption, harmful gases emitted during the refrigeration process, destroying the atmospheric ozone layer or causing greenhouse effects. Therefore, it is of great significance to explore new refrigeration technologies that are both energy-saving and environmentally friendly. Compared with gas compression refrigeration technology, magnetic refrigeration technology has sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C28/00B22F3/02C22F1/16C22F1/02C21D1/26B22F9/04C21D1/18C23C10/28H01F1/01H01F41/02
CPCC22C28/00B22F3/02C22F1/16C22F1/02C21D1/26B22F9/04C22F1/002C23C10/28H01F1/015H01F41/02C22C2202/02
Inventor 郑新奇王守国邵苏杭许家旺杨淑娴奚磊张静言
Owner UNIV OF SCI & TECH BEIJING