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Preparation method for manganese-ferrum-phosphorus-silicon magnetic cooling alloy

A magnetic refrigeration and phosphorus-silicon technology, which is applied in the field of preparation of manganese-iron-phosphorus-silicon magnetic refrigeration alloys, can solve problems such as unfavorable environmental protection, difficulty in synthesizing manganese-iron-phosphorus-silicon materials, and difficulty in solving manganese-iron-phosphorus-silicon materials.

Active Publication Date: 2014-04-16
赣州兮泓永磁技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are some problems with this technology: First, Freon has a serious damage effect on the atmospheric ozone layer, so it is very unfavorable to environmental protection.
Regrettably, the synthesis of ferromanganese, phosphorus, and silicon materials is difficult, and it is difficult to obtain high-purity iron, manganese, phosphorus, and silicon materials by using some conventional material preparation and processing technologies.

Method used

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  • Preparation method for manganese-ferrum-phosphorus-silicon magnetic cooling alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Manganese, iron, phosphorus, silicon four powder raw materials according to Mn 1.2 Fe 0.8 P 0.6 Si 0.4 The nominal composition (molar ratio) ratio of the mixed powder is subjected to high-energy ball milling, and the technological conditions of the ball milling are: the ball-to-material ratio is 1:10, and the ball-milling time is 2 hours. Spark plasma sintering is carried out on the powder after ball milling under the condition of vacuum, and the technological conditions of sintering are: temperature 920° C., time 5 minutes, pressure 30 MPa. The sintered manganese-iron-phosphorus-silicon alloy block is subjected to heat treatment under the protection of argon, and the process conditions of the heat treatment are: temperature 850° C., time 36 hours. Finally, a manganese-iron-phosphorus-silicon alloy with excellent magnetocaloric properties is obtained.

Embodiment 2

[0014] Manganese, iron, phosphorus, silicon four powder raw materials according to Mn 1.1 Fe 0.9 P 0.5 Si 0.5 The nominal composition (molar ratio) ratio of the mixed powder is subjected to high-energy ball milling, and the technological conditions of the ball milling are: the ball-to-material ratio is 1:10, and the ball-milling time is 2 hours. Spark plasma sintering is carried out on the powder after ball milling under the condition of vacuum, and the technological conditions of sintering are: temperature 940° C., time 3 minutes, pressure 30 MPa. The manganese-iron-phosphorus-silicon alloy block obtained by sintering is subjected to heat treatment under the protection of argon, and the process conditions of the heat treatment are: temperature 875° C., time 24 hours. Finally, a manganese-iron-phosphorus-silicon alloy with excellent magnetocaloric properties is obtained.

Embodiment 3

[0016] Manganese, iron, phosphorus, silicon four powder raw materials according to Mn 1.05 Fe 0.95 P 0.4 Si 0.6 The nominal composition (molar ratio) ratio of the mixed powder is subjected to high-energy ball milling, and the technological conditions of the ball milling are: the ball-to-material ratio is 1:10, and the ball-milling time is 2 hours. Spark plasma sintering is carried out on the powder after ball milling under the condition of vacuum, and the technological conditions of sintering are: temperature 930° C., time 4 minutes, pressure 30 MPa. The sintered manganese-iron-phosphorus-silicon alloy block is subjected to heat treatment under the protection of argon, and the heat treatment process conditions are: temperature 900° C., time 12 hours. Finally, a manganese-iron-phosphorus-silicon alloy with excellent magnetocaloric properties is obtained.

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Abstract

A preparation method for manganese-ferrum-phosphorus-silicon magnetic cooling alloy belongs to the technical field of magnetic material preparation. At first, manganese powder, ferrum powder, phosphorus powder and silicon powder, which serve as raw materials, are mixed according to the mole ratio of 2-x : x : 1-y : y to obtain a nominal composition: Mn2-xFexP1-ySiy, wherein x is larger than or equal to 0.8 and less than or equal to 1.0, and y is larger than or equal to 0.4 and less than or equal to 0.6; then, the high energy ball milling is conducted and the spark plasma sintering is performed under vacuum so as to obtain a manganese-ferrum-phosphorus-silicon alloy block body; and finally, the obtained manganese-ferrum-phosphorus-silicon alloy block body is subjected to heat treatment under the protection of argon so as to obtain the manganese-ferrum-phosphorus-silicon magnetic cooling alloy with an excellent magnetocaloric property. The curie temperature of the manganese-ferrum-phosphorus-silicon magnetic cooling alloy is adjusted through regulating the manganese-ferrum ratio and the phosphorus-silicon ratio within the temperature range from 50 DEG C below zero to 50 DEG C; and the obtained manganese-ferrum-phosphorus-silicon alloy has a greater magnetic entropy change under a 2 tesla field, thereby being beneficial to be used in a room-temperature area magnetic cooling technology.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a preparation method of a manganese-iron-phosphorus-silicon magnetic refrigeration alloy. Background technique [0002] At present, the gas compression refrigeration technology using Freon as the refrigerant is widely used in household appliances such as refrigerators and air conditioners in the room temperature zone. But there are some problems with this technology: First, Freon has a serious destructive effect on the atmospheric ozone layer, so it is very unfavorable to environmental protection. Secondly, the efficiency of gas compression refrigeration is very low, so the energy consumption is large, which is not conducive to energy saving. In addition, refrigeration devices designed with this technology are complex and costly to manufacture. Therefore, magnetic refrigeration technology with high efficiency, energy saving, environmental prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05B22F3/105
Inventor 岳明徐航徐明锋赵金良金头男刘卫强张东涛刘丹敏张久兴
Owner 赣州兮泓永磁技术有限公司
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