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Low thermal hysteresis 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 magnetic material, diamagnetic/paramagnetic material, inorganic material magnetism, etc., can solve the problem of large thermal hysteresis, unfavorable material practical application, poor mechanical stability and fragile And other issues

Active Publication Date: 2021-07-06
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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  • Low thermal hysteresis mn-fe-p-si based magnetic refrigeration material and preparation method thereof
  • Low thermal hysteresis mn-fe-p-si based magnetic refrigeration material and preparation method thereof
  • Low thermal hysteresis mn-fe-p-si based magnetic refrigeration material 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 thermal hysteresis and a preparation method thereof, belonging to the technical field of magnetic refrigeration materials, and the material composition is (Mn, Fe) 2‑x Nb x (P , Si), in the formula, the steps are: weighing manganese flakes, iron powder, niobium powder, phosphorus block, and silicon block according to the molar ratio of each element in the chemical formula, and ball milling under the protection of argon; the powder after ball milling Put it into a mold and press it into a disc; the pressed sample is annealed under argon, and then quickly quenched into cold water to prepare the sample. The present invention passes to (Mn, Fe) 2 The (P, Si) material is doped with an appropriate amount of Nb, so that the phase transition temperature can be continuously adjusted around room temperature, and the thermal hysteresis is greatly reduced, while maintaining a large magnetic entropy change, which is conducive to the application of the material in room temperature magnetic refrigeration.

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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Patent Type & Authority Patents(China)
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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