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Mn-Fe-P-Si-based magnetic refrigeration material with low heat stagnation and preparation method thereof

A mn-fe-p-si, magnetic refrigeration material technology, applied in the direction of magnetic material, diamagnetic/paramagnetic material, inorganic material magnetism, etc., can solve the problem of large thermal hysteresis, poor mechanical stability and fragile, unfavorable material practical application and other problems, to achieve the effects of reduced thermal hysteresis, low cost and easy implementation

Active Publication Date: 2019-10-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to (Mn,Fe) 2 The (P, Si) material undergoes a first-order magnetoelastic phase transition, so the phase transition process is accompanied by a large thermal hysteresis, and the mechanical stability is poor and brittle, which is not conducive to the practical application of the material.

Method used

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  • Mn-Fe-P-Si-based magnetic refrigeration material with low heat stagnation and preparation method thereof
  • Mn-Fe-P-Si-based magnetic refrigeration material with low heat stagnation and preparation method thereof
  • Mn-Fe-P-Si-based magnetic refrigeration material with low heat stagnation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Manganese flakes, iron powder, niobium powder, phosphorus block, silicon block according to Mn 1.1 Fe 0.88 Nb 0.02 P 0.43 Si 0.57 The molar ratio of the alloy (x=0.02) was 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 40 Hz;

[0024] (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.

[0025] (3) Seal the pressed sample into a quartz tube filled with argon protection, sinter at 1100°C for 20 hours, and quench in cold water (tap water) to obtain the sample.

Embodiment 2

[0027] It was prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, Nb, P, and Si was changed to 1.1:0.87:0.03:0.43:0.57 (x=0.03), and the others were the same.

Embodiment 3

[0029] It was prepared by a method similar to that of Example 1, except that the molar ratio among Mn, Fe, Nb, P, and Si was changed to 1.1:0.86:0.04:0.43:0.57 (x=0.04), and the others were the same.

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Abstract

The invention discloses a Mn-Fe-P-Si-based magnetic refrigeration material with low heat stagnation and a preparation method thereof, and belongs to the technical field of magnetic refrigeration materials. The material comprises the component of (Mn,Fe)<2-x>Nb<x>(P,Si), wherein 0.02<=x<=0.04. The method comprises the following steps: weighing a manganese sheet, iron powder, niobium powder, a phosphorus block and a silicon block according to the molar ratio of each element in the chemical formula; carrying out ball milling under the protection of argon; putting the ball-milled powder into a mold, and pressing into a wafer; and carrying out annealing treatment on the pressed sample under argon, and then rapidly quenching the sample into cold water to prepare the sample. According to the method, a proper amount of Nb is doped into the (Mn, Fe)<2>(P, Si) material, so that the phase change temperature is continuously adjustable near the room temperature, the heat stagnation is greatly reduced, larger magnetic entropy change is kept, and the application of the material in room-temperature magnetic refrigeration is facilitated.

Description

technical field [0001] The invention relates to the field of magnetic refrigeration at room temperature, in particular to a manganese-iron-phosphorus-silicon-based alloy magnetic refrigeration material and a preparation method thereof. Background technique [0002] Magnetic refrigeration technology is a new solid-state refrigeration technology that uses magnetic materials as working fluids to achieve refrigeration based on the magnetocaloric effect. Compared with traditional gas compression refrigeration, magnetic refrigeration has the following advantages: (1) No pollution, the magnetic refrigeration working medium is solid material, and the heat transfer medium is water or water-based solvent, and no harmful gas will be discharged into the atmosphere , and there is no leakage or flammability problem; (2) The vibration and noise of the refrigeration equipment are small, the magnetic refrigeration device is small in size, and does not use a compressor, the structure is simpl...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F1/00C22C22/00C22C1/04
CPCC22C1/04C22C22/00H01F1/0018H01F1/015
Inventor 缪雪飞胡述圆徐锋钟高力王文尧张玉晶张怡临王星仪陈楚尧
Owner NANJING UNIV OF SCI & TECH
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