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

A mn-fe-p-si, magnetic refrigeration material technology, applied in the direction of refrigerators, refrigeration and liquefaction, machine operation, etc., can solve the adverse effects of magnetocaloric effects, weaken the mixed magnetic properties of materials and other problems, and achieve the optimization of magnetocaloric effects , optimize the Curie temperature, reduce the effect of thermal hysteresis

Active Publication Date: 2021-06-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies have found that the Curie temperature Tc and thermal hysteresis of the material can be adjusted by changing the ratio of Mn / Fe and P / Si, but this will weaken the mixed magnetic properties of the material and have an adverse effect on the magnetocaloric effect.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Put manganese flakes, iron powder, phosphorus block, silicon block, zinc powder into MnFe 0.90 P 0.6 Si 0.4 Zn 0.05 (x=0.05) The molar ratio of each element in the chemical formula is weighed, and put into a stainless steel ball mill jar for ball milling under the protection of an argon atmosphere. 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.

[0023] (2) Put the ball-milled powder into a mold with a diameter of 10mm, and press it into a disc-shaped sample of φ10*5mm under a pressure of 750MPa, and the pressing time is 5min.

[0024] (3) Seal the pressed sample into a quartz tube filled with argon protection, sinter at 1100°C for 20 hours, and then quench in cold water to obtain the sample.

Embodiment 2

[0026] Prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, P, Si, and Zn is changed to 1:0.85:0.6:0.4:0.1, that is, x=0.1, the rest are the same.

Embodiment 3

[0028] Prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, P, Si, and Zn is changed to 1:0.75:0.6:0.4:0.2, that is, x=0.2, the rest are the same.

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Abstract

The invention discloses a Zn-doped Mn-Fe-P-Si-based magnetic refrigeration material and a preparation method thereof, belonging to the technical field of magnetic refrigeration materials. The composition of the material is (Mn, Fe) 1.95‑x (P,Si) Z no x , where the value of x is 0.05~0.1. The preparation steps of the material are as follows: weighing manganese sheet, iron powder, phosphorus block, silicon block, and zinc powder according to the molar ratio of each element in the chemical formula, and ball milling under the protection of argon; sample; the sample was annealed in vacuum, and then quickly quenched into cold water to prepare the sample. The invention can adjust the phase transition temperature of the MnFePSi magnetic refrigeration material to near room temperature by doping an appropriate amount of Zn into the MnFePSi material, reducing thermal hysteresis while maintaining a large magnetic entropy change, which is beneficial to the material's magnetic refrigeration at room temperature. application.

Description

technical field [0001] The invention relates to the field of magnetic refrigeration material preparation, in particular to a Zn-doped Mn-Fe-P-Si-based magnetic refrigeration material and a preparation method thereof. Background technique [0002] Refrigeration technology is ubiquitous in our modern social life. With the energy crisis in the world, the environment continues to deteriorate. Due to the unavoidable shortcomings of traditional compression refrigeration technology, such as loud noise, low efficiency, and high pollution, the traditional refrigerant Freon Due to the greenhouse effect and the destruction of the ozone layer, it will be phased out gradually. With the introduction of the concept of green environmental protection, in order to protect the atmospheric environment on which we live, the United Nations Environment Program has signed an agreement to ban the use of fluorine-containing refrigerants, which is why we must develop new cooling technologies. As a ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/06C22C33/02B22F9/04B22F3/02B22F3/10F25B21/00
CPCB22F3/02B22F3/10B22F9/04B22F2009/043B22F2999/00C22C30/06C22C33/0214C22C33/0278C22C38/002C22C38/02C22C38/04F25B21/00B22F2201/11Y02B30/00
Inventor 缪雪飞钟高力徐锋胡述圆张玉晶
Owner NANJING UNIV OF SCI & TECH
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