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A method for improving the half-height width of magnetic entropy curve of lafesi alloy magnetic refrigeration material

A magnetic refrigeration material and magnetic entropy change technology, which is applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of magnetic entropy change, low half-height width, lower yield, and easy water ingress. Achieve wide half-width of magnetic entropy curve and reduce cost

Active Publication Date: 2020-01-10
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to obtain a higher magnetic entropy change in the prior art, the quenching process is often used, that is, the heat-treated material is cooled in ice water or liquid nitrogen. The cost of ice water cooling is low and the speed is fast, but the material is easily broken. Water enters, oxidized and corroded, reducing the yield; liquid nitrogen cooling will not be oxidized even if the material is broken, and the cooling speed is faster, but the cost is high
Keep the NaZn of the material after quenching with ice water or liquid nitrogen 13 Phase, so it has a high magnetic entropy change, but the magnetic entropy change is often low at half-height, such as only about 4-5K under a 1T magnetic field. In this case, a variety of magnetic refrigeration materials with different Curie temperatures are required. Use can achieve better results, and the corresponding cost is higher

Method used

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  • A method for improving the half-height width of magnetic entropy curve of lafesi alloy magnetic refrigeration material
  • A method for improving the half-height width of magnetic entropy curve of lafesi alloy magnetic refrigeration material
  • A method for improving the half-height width of magnetic entropy curve of lafesi alloy magnetic refrigeration material

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Embodiment 1

[0025] 1. a method for improving the FWHM of the magnetic entropy curve of LaFeSi alloy magnetic refrigeration material, is characterized in that comprising the following steps:

[0026] a) Heat treatment: subject the LaFeSi alloy magnetic refrigeration material to high-temperature heat treatment at 1000-1300° C., and the heat treatment time is 1-24 hours;

[0027] b) Furnace cooling: turn off the heating after the heat treatment, and cool in the furnace for 0 to 60 minutes;

[0028] c) Air cooling: take out the heating body in the furnace after the furnace cooling is completed, and use a fan or blower to carry out air cooling treatment on the furnace body and the LaFeSi alloy magnetic refrigeration material in the furnace body, so that it is cooled to room temperature within 10 to 300 minutes;

[0029] d) Hydrogen charging: crush the cooled LaFeSi alloy magnetic refrigeration material until the particle size is less than 1 mm, and perform hydrogen charging treatment in a hydr...

Embodiment 2

[0031] 1. a method for improving the FWHM of the magnetic entropy curve of LaFeSi alloy magnetic refrigeration material, is characterized in that comprising the following steps:

[0032] a) Heat treatment: subject the LaFeSi alloy magnetic refrigeration material to high-temperature heat treatment at 1000-1300° C., and the heat treatment time is 1-24 hours;

[0033] b) Furnace cooling: turn off the heating after the heat treatment, and cool in the furnace for 0 to 60 minutes;

[0034] c) Air cooling: take out the heating body in the furnace after the furnace cooling is completed, and use a fan or blower to carry out air cooling treatment on the furnace body and the LaFeSi alloy magnetic refrigeration material in the furnace body, so that it is cooled to room temperature within 10 to 300 minutes;

[0035] d) Hydrogen charging: crush the cooled LaFeSi alloy magnetic refrigeration material until the particle size is less than 1 mm, and perform hydrogen charging treatment in a hydr...

Embodiment 3

[0037] 1. a method for improving the FWHM of the magnetic entropy curve of LaFeSi alloy magnetic refrigeration material, is characterized in that comprising the following steps:

[0038] a) Heat treatment: subject the LaFeSi alloy magnetic refrigeration material to high-temperature heat treatment at 1000-1300° C., and the heat treatment time is 1-24 hours;

[0039] b) Furnace cooling: turn off the heating after the heat treatment, and cool in the furnace for 0 to 60 minutes;

[0040] c) Air cooling: take out the heating body in the furnace after the furnace cooling is completed, and use a fan or blower to carry out air cooling treatment on the furnace body and the LaFeSi alloy magnetic refrigeration material in the furnace body, so that it is cooled to room temperature within 10 to 300 minutes;

[0041] d) Hydrogen charging: crush the cooled LaFeSi alloy magnetic refrigeration material until the particle size is less than 1 mm, and perform hydrogen charging treatment in a hydrog...

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Abstract

The invention relates to the technical field of magnetic refrigeration materials. The invention discloses a method for improving the half-height width of the magnetic entropy curve of a LaFeSi alloy magnetic refrigeration material. High-temperature heat treatment for 1 to 24 hours, followed by furnace cooling and air cooling to room temperature, and finally hydrogen filling operation to obtain a LaFeSi alloy magnetic refrigeration material with a wide half-height width of the magnetic entropy curve. After being processed by the method of the present invention, the LaFeSi alloy magnetic refrigeration material has a wider half-height width of the magnetic entropy curve under the premise of maintaining a larger magnetic entropy change. In practical applications, the types of magnetic refrigeration materials used can be greatly reduced. cut costs.

Description

technical field [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a method for increasing the half-height width of a magnetic entropy curve of a LaFeSi alloy magnetic refrigeration material. Background technique [0002] Magnetic refrigeration is a technology that uses the magnetocaloric effect of magnetic materials in the process of applying a magnetic field and demagnetizing it to perform refrigeration. Compared with traditional compressor refrigeration, it has the advantages of small size, high theoretical efficiency, green and pollution-free, and is a very potential technology to replace compressor refrigeration. [0003] The core of magnetic refrigeration technology is magnetic field and magnetic refrigeration material. Generally, the higher the magnetic field, the higher the refrigeration capacity of the magnetic refrigeration material, but the higher the cost increase, so the researchers of magnetic refrigeratio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/74H01F1/01H01F41/00
CPCC21D1/74C21D6/007C21D6/008H01F1/015H01F41/00
Inventor 孙永阳王占洲洪群峰韩相华郝忠彬
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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