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Thulium-nickel material for magnetic refrigeration and preparation method thereof

A magnetic refrigeration and rhomboid technology, applied to magnetic materials, inorganic material magnetism, metal material coating technology, etc., to achieve the effects of low energy consumption, good uniformity, and uniform color

Active Publication Date: 2022-06-28
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 methods for their preparation.

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

[0048]Step S1: Weigh powdered metal Tm and Ni raw materials according to the molecular formula ratio, 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 chemical formula. 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 the tablet press mold, and press the tablet. Wherein, the inner diameter of the mold is 1 cm, the applied pressure is 10 MPa, and after the tableting treatment, it is still for 3-5 minutes, so that the raw materials in the sheet-like sample are fully contacted;

[0050] Step S3: vacuum annealing the sheet sample obtained in step S2, the annealing temperature is 1000 ° C, and the annea...

Embodiment 2

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

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

[0064] Step S1: Weigh powdered metal Tm and Ni raw materials according to the molecular formula ratio and mix, wherein, the amount of the material of the raw material Ni is weighed according to the chemical formula, and the amount of the material of the raw material Tm is weighed in excess 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 the tablet press mold, and press the tablet. Wherein, the inner diameter of the mold is 1cm, the applied pressure is 10Mpa, and the tablet is static for 3-5min, so that the raw materials in the sheet sample are fully contacted;

[0066] Step S3: vacuum annealing the sheet sample obtained in step S2, the annealing temperatur...

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Abstract

The invention relates to a thulium-nickel material for magnetic refrigeration and a preparation method thereof. The chemical formula of the thulium-nickel material is: Tm 3+x Ni 2+y , wherein, ‑0.1≤x≤0.1, ‑0.1≤y≤0.1, has a rhombohedral crystal structure, the space group of the crystal structure is R‑3, and the phase transition temperature is between 2‑6K, under the change of 0‑2T magnetic field The peak value of magnetic entropy change is between 15‑17J / (kg·K). The preparation method adopted in the present invention includes tableting, crushing, grinding, etc., is clean and environmentally friendly, and the obtained thulium-nickel material can be used as magnetic refrigeration in extremely low temperature regions and low magnetic fields.

Description

technical field [0001] The invention belongs to the field of magnetic refrigeration, in particular to a thulium-nickel material for magnetic refrigeration and a preparation method thereof. Background technique [0002] Modern society is more and more inseparable from refrigeration technology, from people's daily life, to industrial and agricultural production, medical and health, national defense technology, etc., are inseparable from refrigeration technology. 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, damaging the atmospheric ozone layer or causing the greenhouse effect. Therefore, it is of great significance to explore new refrigeration technologies that are both energy-saving and environmentally friendly. Compared with gas compression refrigeration technolo...

Claims

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Application Information

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Patent Type & Authority Patents(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