High atmospheric pressure synthetic method for flaky La(Fe, Si)13-based hydride block with efficient room temperature magnetic refrigeration performance

A synthesis method and hydride technology, which can be applied to various metal hydrides, etc., can solve the problems of unusable samples, reducing the magnetic entropy change per unit volume, and reducing the value of the magnetic entropy change.

Inactive Publication Date: 2016-02-10
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, directly on bulk La(Fe,Si) 13 Hydrogenation of the base compound will generate a large number of cracks, making the sample unusable
CN103468226A patent discloses a lanthanum-iron-silicon-based room-temperature magnetic refrigeration composite material and its preparation method. The method is formed by mixing the lanthanum-iron-silicon-based compound with polymer materials and additives, cold pressing and then heating and solidifying, but due to the addition of Magnetic binders and polymer materials will reduce the magnetic entropy change per unit volume
At room temperature, hydrogen atoms will diffuse from the small bulk phase to the bulk phase, causing the entire compound to have two Curie temperatures, thereby seriously reducing the value of the magnetic entropy change

Method used

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  • High atmospheric pressure synthetic method for flaky La(Fe, Si)13-based hydride block with efficient room temperature magnetic refrigeration performance
  • High atmospheric pressure synthetic method for flaky La(Fe, Si)13-based hydride block with efficient room temperature magnetic refrigeration performance
  • High atmospheric pressure synthetic method for flaky La(Fe, Si)13-based hydride block with efficient room temperature magnetic refrigeration performance

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Experimental program
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Embodiment 1

[0027] will have cubic NaZn 13 structure of La 0.5 PR 0.5 Fe 11.4 Si 1.6After the master alloy is crushed into particles with a diameter of 1-2 mm, it is placed in an autoclave to absorb hydrogen for 5 hours at a hydrogen absorption temperature of 500°C and a hydrogen pressure of 50 MPa. Maintain the hydrogen pressure of 50 MPa and cool to room temperature to obtain saturated hydrogen-absorbing hydride particles. The hydride particles were ground into a powder with a particle size of less than 50 μm, and then pressed under a pressure of 6 MPa into a sheet-like block with a diameter of 10 mm and a thickness of 0.8 mm. The pressed sheet samples were placed in a high-pressure heat treatment device for sintering treatment, the sintering time was 24 hours, the sintering temperature was 600°C, and the hydrogen pressure was 50MPa. After the sintering, it was cooled to room temperature under a hydrogen atmosphere, and the hydrogen pressure was maintained at 50 MPa during the cool...

Embodiment 2

[0029] will have cubic NaZn 13 structure of La 0.9 Ce 0.1 Fe 11.35 mn 0.35 Si 1.3 After the master alloy is pulverized into particles with a diameter of 1-2 mm, hydrogen is absorbed in a high-pressure heat treatment device for 5 hours at a hydrogen absorption temperature of 500°C and a hydrogen pressure of 50 MPa. Maintain the hydrogen pressure of 50 MPa and cool to room temperature to obtain saturated hydrogen-absorbing hydride particles. The hydride particles were ground into a powder with a particle size of less than 50 μm, and then pressed under a pressure of 6 MPa into a sheet-like block with a diameter of 10 mm and a thickness of 0.8 mm. The pressed sheet samples were placed in a high-pressure heat treatment device for sintering treatment, the sintering time was 48 hours, the sintering temperature was 500°C, and the hydrogen pressure was 50MPa. After the sintering, it was cooled to room temperature under a hydrogen atmosphere, and the hydrogen pressure was maintain...

Embodiment 3

[0032] will have cubic NaZn 13 structure of La 0.5 PR 0.5 Fe 11.4 Si 1.6 After the master alloy is crushed into particles with a diameter of 1-2 mm, it is placed in an autoclaving device to absorb hydrogen for 3 hours, the hydrogen absorption temperature is 400°C, and the hydrogen pressure is 60MPa. Maintain the hydrogen pressure of 60 MPa and cool to room temperature to obtain saturated hydrogen-absorbing hydride particles. The hydride particles were ground into a powder with a particle size of less than 50 μm, and then pressed under a pressure of 8 MPa into a sheet-like block with a diameter of 20 mm and a thickness of 0.6 mm. The pressed sheet-like samples were placed in a high-pressure heat treatment device for sintering. The sintering time was 24 hours, the sintering temperature was 650° C., and the hydrogen atmosphere pressure was 60 MPa. After the sintering, it was cooled to room temperature under a hydrogen atmosphere, and the hydrogen pressure was maintained at 6...

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Abstract

The invention belongs to the field of new function materials and provides a high atmospheric pressure synthetic method for a flaky La(Fe, Si)13-based hydride block with efficient room temperature magnetic refrigeration performance. According to the method, a La(Fe, Si)13-based compound with a NaZn13 structure is smashed before being placed in a high atmospheric pressure heat treatment device, and subjected to hydrogen absorption in a hydrogen atmosphere before being cooled to the room temperature, and then a saturated hydrogen absorption hydride is obtained; the saturated hydrogen absorption hydride is pressed into a flake, sintered and cooled naturally, and then the flaky hydride block is obtained. By the adoption of the method, the problem of hard molding to the La(Fe, Si)13-based hydride in practical application is solved, and a flaky La(Fe, Si)13-based magnetic refrigeration working medium with efficient room temperature magnetic refrigeration performance and capable of being used at a driving magnetic cold-accumulation refrigerator can be obtained.

Description

technical field [0001] The invention belongs to the field of new functional materials, in particular to a flaky La(Fe,Si) with high-efficiency room temperature magnetic refrigeration performance 13 High-pressure synthesis method of base hydride bulk. Background technique [0002] Low temperature and refrigeration technology are playing an increasingly important role in today's society. Traditional gas refrigeration technology has many shortcomings such as low refrigeration efficiency and large noise impact. Moreover, Freon, the compressed working medium used in gas refrigeration, will seriously damage the atmospheric environment. With the complete cessation of production and use of halogenated hydrocarbons containing freon, the magnetic refrigeration technology developed based on the magnetocaloric effect of materials has attracted widespread attention at home and abroad for its advantages of high refrigeration efficiency, low noise, and no pollution to the environment....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/24
Inventor 孙乃坤郭杰任增鑫徐送宁徐志洁杜宝盛杜胜杰
Owner SHENYANG LIGONG UNIV
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