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Mo doped mn-fe-p-si based magnetic refrigeration material and preparation method thereof

A magnetic refrigeration material, cold water technology, applied in the direction of magnetic material, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve the problems of unfavorable material practical application, poor mechanical stability and fragile, weakening material mixed magnetic properties, etc., to achieve optimization Magnetocaloric effect, low cost, optimized Curie temperature effect

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the MnFePSi material undergoes a first-order magnetoelastic phase transition, the phase transition process is accompanied by large thermal hysteresis, and the mechanical stability is poor and brittle, which is not conducive to the practical application of the material.
Previous studies have found that the Curie temperature Tc and thermal hysteresis of the material can be adjusted by changing the Mn / Fe ratio and P / Si ratio, but this will weaken the mixed magnetic properties of the material and have an adverse effect on the magnetocaloric effect; it has also been found that boron-doped Atoms can significantly increase the Curie temperature Tc of the material, and at the same time significantly reduce the thermal hysteresis, but this adjustment only increases Tc in one direction and is not easy to control

Method used

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  • Mo doped mn-fe-p-si based magnetic refrigeration material and preparation method thereof
  • Mo doped mn-fe-p-si based magnetic refrigeration material and preparation method thereof
  • Mo doped mn-fe-p-si based magnetic refrigeration material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Manganese flakes, iron powder, molybdenum powder, phosphorus block, silicon block according to Mn 1.1 Fe 0.88 Mo 0.02 P 0.43 Si 0.57 (X=0.02) The molar ratio of the alloy is weighed, and put into a stainless steel ball mill jar for ball milling under the protection of argon. The ball milling process conditions are: the mass ratio of steel balls to raw materials is 6:1, the ball milling time is 10 hours, and the frequency is 30 Hz;

[0022] (2) Put the ball-milled powder into a mold with a diameter of 10mm, and press it under a pressure of 750MPa to form The disc-shaped sample, the pressing time is 5min.

[0023] (3) Seal the pressed sample into a quartz tube under vacuum conditions, sinter at 1100° C. for 40 hours, and then quench in cold water to obtain a sample.

Embodiment 2

[0025] It was prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, Mo, P, and Si was changed to 1.1:0.86:0.04:0.43:0.57, that is, X=0.04, the rest were the same.

Embodiment 3

[0027] Prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, Mo, P, and Si is changed to 1.1:0.84:0.06:0.43:0.57, that is, X=0.06, the rest are the same.

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Abstract

The invention discloses a Mo-doped MnFePSi-based alloy magnetic refrigeration material and a preparation method thereof, belonging to the technical field of magnetic refrigeration materials. The material composition is Mn 1.1 Fe 0.9‑X Mo X P 0.43 Si 0.57 , 0.02≤X≤0.04, the preparation steps are: under the protection of argon atmosphere, ball mill manganese sheet, iron powder, molybdenum powder, phosphorus block and silicon block according to the molar ratio of each element in the chemical formula; the powder after ball milling Pressed into a sample; the sample was sealed in a quartz tube filled with argon protection, and quenched in cold water after annealing. In the invention, by doping an appropriate amount of Mo into the MnFePSi material, the phase transition temperature can be continuously adjusted around room temperature, greatly reducing thermal hysteresis, while maintaining a large magnetic entropy change, which is beneficial to the application of the material in the field of room temperature magnetic refrigeration.

Description

technical field [0001] The invention relates to the field of room temperature magnetic refrigeration, in particular to a Mo-doped MnFePSi-based alloy magnetic refrigeration material and a preparation method thereof. Background technique [0002] Magnetic refrigeration technology is a brand-new refrigeration technology that uses magnetic materials as working fluids to realize refrigeration by using the change of magnetic entropy of materials during the process of adding a magnetic field and removing the magnetic field. Compared with traditional gas compression refrigeration, magnetic refrigeration technology has no pollution, low noise, small footprint, and high energy conversion efficiency. It is considered to be a new green refrigeration technology that is expected to solve human energy problems and environmental pollution problems. The key to the application of magnetic refrigeration technology lies in the selection and development of suitable magnetic refrigerants. The r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/24C22C30/00H01F1/01H01F41/02
CPCB22F3/02B22F3/1007B22F3/24B22F2003/248C22C22/00C22C30/00H01F1/015H01F41/02
Inventor 缪雪飞王文尧徐锋胡述圆张玉晶李琳查嘉驹地胡玛尔·艾合买提
Owner NANJING UNIV OF SCI & TECH
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