A kind of preparation method of high-performance rare earth-iron-based magnetic refrigeration material

A magnetic refrigeration material, high-performance technology, applied in the direction of machine operation, machines using electric/magnetic effects, refrigerators, etc., can solve the problems of limited shape and size of materials, long annealing time, high annealing temperature, etc. Achieve the effects of fast cooling and solidification, lower subsequent annealing temperature, and high solid solubility

Active Publication Date: 2016-04-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing preparation methods have their own problems that are difficult to overcome, such as long annealing time, high annealing temperature, uneven cooling rate, limited material shape and size, etc., which make it unable to meet the needs of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) According to the magnetic refrigeration material composition LaFe 11.88 co 0.12 Si1 Weigh the raw materials of each element and mix them;

[0022] 2) Vacuum smelting the mixed raw materials. After repeated smelting for 3 times, the liquid metal is directly atomized with high-pressure gas to form a spherical rare earth-iron-based alloy powder of 5 μm. The atomization medium is helium with a purity greater than 99.99%. The atomization pressure is 20MPa;

[0023] 3) The spherical rare earth-iron-based alloy powder is annealed for 0.5h under vacuum for a short time, the annealing temperature is 1100°C, and NaZn is obtained after quenching with liquid nitrogen 13 type monophasic organization;

[0024] 4) the annealed spherical powder is pressed into shape under vacuum by a pressure of 100 MPa;

[0025] 5) The compact is made into a single-phase bulk rare earth-iron-based magnetic refrigeration material through a hot-pressing process, the hot-pressing temperature is 60...

Embodiment 2

[0028] 1) According to the magnetic refrigeration material composition La 0.5 PR 0.5 Fe 9.9 co 0.5 Ni 0.5 Nb 0.1 al 0.2 Si 1.8 Weigh the raw materials of each element and mix them;

[0029] 2) Vacuum smelting the mixed raw materials. After repeated smelting for 6 times, the liquid metal is directly atomized with high-pressure gas to form a spherical rare earth-iron-based alloy powder of 20 μm. The atomization medium is argon gas with a purity greater than 99.99%, and the atomization pressure is 10MPa;

[0030] 3) The spherical rare earth-iron-based alloy powder is annealed for 6 hours under the protection of argon, the annealing temperature is 950 °C, and NaZn is obtained after quenching in ice water 13 type monophasic organization;

[0031] 4) Pressing the annealed spherical powder under the protection of argon under a pressure of 150 MPa;

[0032] 5) The compact was made into a single-phase bulk rare earth-iron-based magnetic refrigeration material by a spark plasm...

Embodiment 3

[0035] 1) According to the magnetic refrigeration material composition La 0.99 Ce 0.01 Fe 11.5 al 1.5 C 0.01 Weigh the raw materials of each element and mix them;

[0036] 2) Vacuum smelting the mixed raw materials, and after repeated smelting for 4 times, the liquid metal is directly atomized with high-pressure gas to form a 10 μm spherical rare earth-iron-based alloy powder. The atomization medium is helium with a purity greater than 99.99%, and the atomization pressure is 15MPa;

[0037] 3) The spherical rare earth-iron-based alloy powder is annealed for 4 hours under vacuum for a short time, the annealing temperature is 1000°C, and NaZn is obtained after quenching with liquid nitrogen 13 type monophasic organization;

[0038] 4) The annealed spherical powder is pressed into shape under the protection of argon by a pressure of 200MPa;

[0039] 5) The compact is made into a single-phase bulk rare earth-iron-based magnetic refrigeration material through a hot-pressing ...

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Abstract

The invention discloses a preparation method for high-performance rare earth-iron-based magnetic cooling materials and relates to the preparation technology of magnetic cooling materials. The preparation method comprises the main steps that 1), according to the components of the magnetic cooling materials, element raw materials are weighed and mixed; 2) vacuum melting is conducted on the mixed raw materials; after repeated melting, high-pressure gas is used for directly atomizing liquid metal, and spherical rare earth-iron-based alloy powder is formed; 3) short-time annealing is conducted on the spherical rare earth-iron-based alloy powder under vacuum or protective gas, and a NaZn13 type homogeneous structure is obtained after quenching; 4) compression forming is conducted on the quenched spherical powder under the protective gas or vacuum; 5) single-phase block rare earth-iron-based magnetic cooling materials are formed by compact pieces through a hot-pressing or spark plasma sintering method. The rare earth-iron-based magnetic cooling materials prepared based on the method are small in grain structure, even in component, free of segregation and single in phase structure, and the magnetic thermal performance is significantly improved. The preparation method for the high-performance rare earth-iron-based magnetic cooling materials is simple in technological process, easy to operate, high in preparation efficiency and suitable for large-scale mass production.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration material preparation, in particular to a preparation method of a high-performance rare earth-iron-based magnetic refrigeration material. Background technique [0002] Refrigeration technology has been widely used in industrial production and daily life, but the existing technology has low efficiency and great harm to the environment. Therefore, some harmful refrigerants are gradually banned, which requires the development of new refrigeration technologies. Magnetic refrigeration is a new type of green refrigeration technology with great application potential discovered by research. It has the advantages of high efficiency, energy saving, and environmental protection. It will gradually replace the traditional gas compression refrigeration technology. [0003] Magnetic refrigeration materials are the basis for the application of magnetic refrigeration technology, and the development ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F3/16F25B21/00
CPCY02B30/00
Inventor 崔熙贵崔承云程晓农许晓静
Owner JIANGSU UNIV
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