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MnFePSi-based room-temperature magnetic refrigeration material and preparation method thereof

A magnetic refrigeration material and room temperature technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of small thermal hysteresis and magnetic hysteresis, achieve small magnetic hysteresis and thermal hysteresis, increase magnetic entropy, and achieve Curie temperature Continuously adjustable effect

Active Publication Date: 2013-01-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another purpose of the present invention is to aim at current Mn 2-x Fe x P 1-y Si y The thermal hysteresis and magnetic hysteresis of the material are large, and its performance is improved by adding B elements and adjusting the ratio of P / Si and Mn / Fe to prepare a Mn with small thermal hysteresis and magnetic hysteresis and large magnetic entropy change. 2-x Fe x P 1-y Si y B z Room temperature magnetic refrigeration material

Method used

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  • MnFePSi-based room-temperature magnetic refrigeration material and preparation method thereof
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  • MnFePSi-based room-temperature magnetic refrigeration material and preparation method thereof

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Embodiment 1

[0036] Step 1: Press Mn, Fe, P, Si and B into Mn 1.2 Fe 0.8 P 1-y Si y B 0.03 (y=0.4,0.5,0.55) (atomic ratio) ratio batching. The total weight of the sample is 10g, and when y=0.4, Mn, Fe, P, Si, and B are 4.684g, 3.174g, 1.321g, 0.798g, and 0.023g, respectively. When y=0.5, Mn, Fe, P, Si, and B are 4.694g, 3.181g, 1.103g, 0.999g, and 0.023g, respectively. When y=0.55, Mn, Fe, P, Si, and B are 4.698g, 3.184g, 0.994g, 1.101g, and 0.023g, respectively.

[0037] Step 2: Put the powder raw material prepared in step 1 into a ball mill jar in a high-purity argon-protected glove box, and after sealing with a cover, the ball mill jar is protected by argon gas atmosphere. Under the ball milling speed of 350 r / min, the mixture in the tank was ground by gap ball milling, and the ball milling was done for 5 hours to obtain a powder larger than 300 mesh.

[0038] Step 3: Put the powder prepared in Step 2 into the grinding tool under the protection of argon, 8 Pa into a cylindrical ...

Embodiment 2

[0045] Step 1: Press Mn, Fe, P, Si and B into Mn 1.2 Fe 0.8 P 0.6 Si 0.4 B z (z=0,0.03,0.05) (atomic ratio) ratio batching. The total weight of the sample is 10g, and when z=0, Mn, Fe, P, and Si are 4.695g, 3.182g, 1.323g, and 0.800g, respectively. When z=0.03, Mn, Fe, P, Si, and B are 4.684g, 3.174g, 1.321g, 0.798g, and 0.023g, respectively. When z=0.05, Mn, Fe, P, Si, and B are 4.677g, 3.170g, 1.318g, 0.797g, and 0.038g, respectively.

[0046] Step 2: Put the powder raw material prepared in step 1 into a ball mill jar in a high-purity argon-protected glove box, and after sealing with a cover, the ball mill jar is protected by argon gas atmosphere. Under the ball milling speed of 350 r / min, the mixture in the tank was ground by gap ball milling, and the ball milling was done for 5 hours to obtain a powder larger than 300 mesh.

[0047] Step 3: Put the powder prepared in Step 2 into the grinding tool under the protection of argon, 8 Pa into a cylindrical sample. The s...

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Abstract

The invention discloses an MnFePSi-based room-temperature magnetic refrigeration material and a preparation method thereof. The chemical formula of the material is Mn1.2Fe0.8P1-ySiyBz, wherein y is greater than or equal to 0.4 and less than or equal to 0.55; and z is greater than or equal to 0 and less than or equal to 0.05. The preparation method comprises the following steps: (1) mixing the Mn, Fe, P, Si and B by mass percent in the formula; (2) filling the prepared powder materials in a ball mill tank under the protection of high-purity argon and capping and sealing the ball mill; (3) calcining the powder obtained from the ball mill under the protection of the argon; and (4) rapidly quenching the melt under the protection of argon after crushing the calcined sample at the melt-spinning speed of 10-20m / s to obtain the belt material, and then annealing and rapidly quenching the belt material in the water to obtain the room-temperature magnetic refrigeration material. The material has simple process and low cost; and in addition, the prepared magnetic refrigeration material has high magnetic entropy and low magnetic lag and heat stagnation.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a novel room-temperature magnetic refrigeration material Mn that contains neither rare earths nor precious metals nor harmful elements. 1.2 Fe 0.8 P 1-y Si y B z and its preparation method. Background technique [0002] Compared with the traditional gas compression refrigeration technology, magnetic refrigeration uses magnetic substances as the refrigerant, which has no damage to the ozone layer and no greenhouse effect, and the magnetic entropy density of the magnetic refrigerant is larger than that of gas, so the refrigeration device can be more compact; No need for a compressor, few moving parts and slow moving speed, low mechanical vibration and noise, high reliability, and long life; in terms of thermal efficiency, gas compression refrigeration technology can generally only reach 5-10% of the Carnot cycle, while magnetic Refrigeration technology can reach 30~60%, showing high refr...

Claims

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Application Information

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IPC IPC(8): H01F1/047C22C22/00C22C1/00
Inventor 曾德长檀竹才郑志刚钟喜春刘仲武余红雅
Owner SOUTH CHINA UNIV OF TECH
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