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Alveolate magnetic heat exchange material preparing technology

A magnetic heat exchange and honeycomb technology, which is applied in the field of processing and preparation of magnetic heat exchange materials, can solve the problems of poor particle density, strength and surface roughness, increased flow resistance of heat exchange medium, and decreased refrigeration capacity of refrigerators. Achieve the effect of improving comprehensive performance, small flow resistance and good heat transfer effect

Inactive Publication Date: 2012-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the former method, the obtained particles are mostly irregular particles with sharp corners; for the latter method, although nearly spherical particles (CN1463350A) can be obtained, further sintering treatment is required Moreover, this method also has problems such as difficulty in controlling the particle shape, poor density, strength and surface roughness of the particles, which lead to the powdering of the magnetic heat exchange material particles during use, resulting in an increase in the flow resistance of the heat exchange medium. Unfavorable phenomena such as large and sharply reduced heat exchange efficiency will reduce the cooling capacity of the refrigerator and shorten its service life.

Method used

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  • Alveolate magnetic heat exchange material preparing technology
  • Alveolate magnetic heat exchange material preparing technology
  • Alveolate magnetic heat exchange material preparing technology

Examples

Experimental program
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Effect test

Embodiment 1

[0030] According to the ratio of 5wt% low melting point P 2 o 5 -ZnO-MgO-Na 2 O glass+95wt%GOS Weigh the material, and use a mixing mixer to mix evenly for 3h; then, put the mixed powder into the kneader, and add 15wt% water, 6wt% plasticizer (glycerin: carboxymethyl Cellulose=1:2), 2wt% liquid paraffin, kneading for 0.5h, then put the kneaded mud into a vacuum mud mill for secondary mud refining, and adopt a circular hole structure of 300 holes / inch 2 The honeycomb porous mold is extruded with an extruder. Cut into a certain size according to the requirements, microwave drying for 10 minutes, drying in a vacuum oven at 80°C for 6 hours, and sintering at 900°C.

Embodiment 2

[0032] According to the ratio of 5wt% low melting point Na 2 O-Al 2 o 3 -B 2 o 3 Glass+95wt%GOS Weigh the material, and use a mixing mixer to mix evenly for 3h; then, put the mixed powder into the kneader, and add 12wt% water, 8wt% polyvinyl alcohol, 3wt% stearic acid, Knead for 1 hour, then enter the vacuum mud mill for secondary mud refining, and adopt a circular hole structure of 400 holes / inch 2 The honeycomb porous mold is extruded with an extruder. Cut into a certain size according to the requirements, microwave drying for 10 minutes, drying in a vacuum oven at 90°C for 5 hours, and sintering at 850°C.

Embodiment 3

[0034] According to the ratio of 6wt% low melting point ZnO-P 2 o 5 Glass+94wt% GdAlO3 Weigh the materials, and use a mixing mixer to mix them uniformly for 3 hours; then, put the mixed powder into a kneader, and add 12wt% water, 8wt% polyvinyl alcohol, 3wt% stearic acid, knead for 1h, and then enter Secondary mud refining is carried out in the vacuum mud refining machine, and the hole structure is circular with 400 holes / inch. 2 The honeycomb porous mold is extruded with an extruder. Cut to a certain size according to the requirements, microwave drying for 10 minutes, drying in a vacuum oven at 90°C for 5 hours, and sintering at 800°C.

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Abstract

The invention provides an alveolate magnetic heat exchange material preparing method, which is characterized in that a magnetic heat exchange material and a molding promoter are mixed according to a certain proportion and are uniformly mixed by a mixed material blender, then solvent, plasticizing agent and lubricant with a certain proportion are added, a kneader is used for kneading, second vacuum pugging processing is carried out, and then an alveolate magnetic heat exchange material blank is obtained with an alveolate porous mould by an extruder through extrusion molding. Finally, the blank is cut to be a certain size, is dried and solidified to obtain an alveolate magnetic heat exchange material with good comprehensive performances. The alveolate magnetic heat exchange material prepared by the technology disclosed by the invention has a porous structure, small flowing resistance and a good heat exchange effect, and because the integral bonding strength of the alveolate magnetic heat exchange material is high, the problems of abrasion and peeling can not occur in the use process, and the material is very suitable for being applied on a refrigerator.

Description

[0001] technical field [0002] The invention relates to a preparation technology of a honeycomb magnetic heat exchange material, belonging to the technical field of processing and preparation of magnetic heat exchange materials. [0003] Background technique [0004] Magnetic heat exchange materials have broad application prospects in refrigerators, and they mainly work based on the magnetocaloric effect induced by the magnetic entropy change of magnetic materials. In practical applications, in order to ensure the heat exchange efficiency between the magnetic heat exchange material and the heat exchange medium, it is usually processed into fine irregular particles or spherical particles for use. For intermetallic compound magnetic heat exchange materials, it can be processed into spherical particles by atomization. However, for oxide or sulfur oxide magnetic heat exchange materials, it is difficult to process and form them by similar methods. For this reason, at present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
CPCY02P20/10
Inventor 叶荣昌熊飞龙毅
Owner UNIV OF SCI & TECH BEIJING
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