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Magnetic refrigeration material and method of manufacturing magnetic refrigeration material

A magnetic refrigeration and powder raw material technology, applied in the direction of magnetic materials, refrigeration and liquefaction, refrigerators, etc., can solve problems such as difficult to limit cracking and cracking

Active Publication Date: 2016-10-12
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, stress-induced cracking is easy to develop in the material, and it may be difficult to limit the occurrence of this cracking

Method used

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  • Magnetic refrigeration material and method of manufacturing magnetic refrigeration material
  • Magnetic refrigeration material and method of manufacturing magnetic refrigeration material
  • Magnetic refrigeration material and method of manufacturing magnetic refrigeration material

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Experimental program
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Effect test

no. 1 approach

[0032] In this embodiment, a magnetic refrigeration material is fabricated, and microchannels are fabricated using the magnetic refrigeration material. figure 1 Shows the manufacturing process.

[0033] (1) Powder preparation process

[0034] The powder raw material 11 is obtained by mixing powders or lumps of a plurality of single substances in a predetermined ratio. Composition examples of the powder raw material 11 are shown below.

[0035] La: 7.1 atomic %

[0036] Fe: 81.7 atomic %

[0037] Si: 11.1 atomic %.

[0038] (2) Melting and rapid cooling process

[0039] Utilize the powder raw material 11 prepared in the powder preparation process, by melting and rapid cooling methods, such as strip casting (strip casting) method, to manufacture 13 structure) sheet 13.

[0040] (3) Powdering process

[0041] The sheet 13 is pulverized to obtain a fine powder 15 . In this process, a powder having a particle size equal to or lower than 214 micrometers (μm) is used as the...

no. 2 approach

[0053] A microchannel heat exchanger was manufactured by a method substantially similar to that of the first embodiment except that the sintering temperature in the sintering process was set to 1000°C.

[0054] After sintering, the filling rate of the magnetic refrigeration material was 90%, and the weight ratio of α-Fe was 2 wt%.

no. 3 approach

[0056] A microchannel heat exchanger was manufactured by a method substantially similar to that of the first embodiment except that the sintering temperature in the sintering process was set to 950°C.

[0057] After sintering, the filling rate of the magnetic refrigeration material was 85%, and the weight ratio of α-Fe was 2 wt%.

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Abstract

A magnetic refrigeration material includes an alloy represented by a composition formula of La(Fe, Si)13H, and the alloy includes α-Fe by a weight ratio lower than 1 wt % and a plurality of pores so that a packing fraction of the alloy is within a range from 85% to 99%.

Description

[0001] Cross References to Related Applications [0002] This application is based on Japanese Patent Application No. 2011-200630 filed on September 14, 2011, the disclosure of which is hereby incorporated by reference. technical field [0003] The present disclosure relates to magnetic refrigeration materials used in refrigeration cycles for air conditioning, refrigeration and freezing. Background technique [0004] As an environment-friendly refrigeration technology, research on a magnetic refrigeration technology that provides clean energy and has high efficiency has been conducted. Magnetic refrigeration material is a magnetic material that produces magnetocaloric effect under an external magnetic field. As shown in Patent Document 1, it is known that La(Fe, Si) 13 The system material produces an improved magnetocaloric effect as a magnetic refrigeration material. In the magnetic refrigerant disclosed in Patent Document 1, it is known that the Curie temperature of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B22F3/14F25B21/00
CPCB22F3/11B22F2003/1051B22F2202/06B22F2202/13C22C33/02C22C33/0278C22C38/002C22C38/005C22C38/02C22C2202/02H01F1/015C22C38/00F25B21/00F25B2321/002
Inventor 藤中智德榊原伸义
Owner DENSO CORP