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A kind of ferromanganese-based magnetic refrigeration material with low thermal hysteresis and its preparation method and application

A magnetic refrigeration material, ferromanganese technology, applied in the preparation of ferromanganese-based magnetic refrigeration materials, in the field of ferromanganese-based magnetic refrigeration materials, can solve the problems of reducing effective refrigeration capacity and limiting applications

Active Publication Date: 2021-06-29
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first-order phase transition of manganese, iron, phosphorus, silicon, germanium, and boron compounds is accompanied by a large thermal hysteresis, which greatly reduces its effective cooling capacity and limits its practical application.

Method used

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  • A kind of ferromanganese-based magnetic refrigeration material with low thermal hysteresis and its preparation method and application
  • A kind of ferromanganese-based magnetic refrigeration material with low thermal hysteresis and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A ferromanganese-based magnetic refrigeration material with low thermal hysteresis is produced by sintering hard magnetic powder and mixed powder containing manganese and iron, wherein the hard magnetic powder is N50 NdFeB magnet. The preparation method of the ferromanganese-based magnetic refrigeration material comprises the steps: the raw materials of the mixed powder are manganese flakes, iron powder (purity ≥ 99.5%), silicon fragments (purity ≥ 99.9%) and red phosphorus powder (purity ≥ 98.9%), take the mixed The raw material of the powder and the nominal composition is Mn 1.2 Fe 0.75 P 0.5 Si 0.5 The molar ratio is used for batching. Mix the above mixed material with N50 hard magnetic powder in a mass ratio of 100:0 to batch 20g. All raw materials were milled in a high-energy ball mill for 5 hours at a ball-to-material ratio of 10:1, and then the powder obtained by ball milling was put into a graphite mold and placed in a LABOX-2010Khv spark plasma sintering (S...

Embodiment 2

[0035] A ferromanganese-based magnetic refrigeration material with low thermal hysteresis is produced by sintering hard magnetic powder and mixed powder containing manganese and iron, wherein the hard magnetic powder is N50 NdFeB magnet. The preparation method of the ferromanganese-based magnetic refrigeration material comprises the steps: the raw materials of the mixed powder are manganese flakes, iron powder (purity ≥ 99.5%), silicon fragments (purity ≥ 99.9%) and red phosphorus powder (purity ≥ 98.9%), take the mixed The raw material of the powder and the nominal composition is Mn 1.2 Fe 0.75 P 0.5 Si 0.5 The molar ratio is used for batching. Mix the above mixed material with N50 hard magnetic powder in a mass ratio of 95:5 for 20g. All raw materials were milled in a high-energy ball mill for 5 hours at a ball-to-material ratio of 10:1, and then the powder obtained by ball milling was put into a graphite mold and placed in a LABOX-2010Khv spark plasma sintering (SPS) sy...

Embodiment 3

[0037] A ferromanganese-based magnetic refrigeration material with low thermal hysteresis is produced by sintering hard magnetic powder and mixed powder containing manganese and iron, wherein the hard magnetic powder is N50 NdFeB magnet. The preparation method of the ferromanganese-based magnetic refrigeration material comprises the steps: the raw materials of the mixed powder are manganese flakes, iron powder (purity ≥ 99.5%), silicon fragments (purity ≥ 99.9%) and red phosphorus powder (purity ≥ 98.9%), take the mixed The raw material of the powder and the nominal composition is Mn1.2 Fe 0.75 P 0.5 Si 0.5 The molar ratio is used for batching. Mix the above mixed material with N50 hard magnetic powder in a mass ratio of 90:10 for 20g. All raw materials were milled in a high-energy ball mill for 5 hours at a ball-to-material ratio of 10:1, and then the powder obtained by ball milling was put into a graphite mold and placed in a LABOX-2010Khv spark plasma sintering (SPS) sys...

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Abstract

The invention belongs to the technical field of refrigeration, and discloses a ferromanganese-based magnetic refrigeration material with low thermal hysteresis and its preparation method and application. The ferromanganese-based magnetic refrigeration material with low thermal hysteresis is composed of hard magnetic powder and a mixture containing manganese and iron It is made by powder sintering; the hard magnetic powder is composed of one or more of NdFeB, SmCo, SmFeN hard magnets; the molar ratio of the mixed powder satisfies the general chemical formula Mn x Fe y‑x P a Si b , wherein, the range of x is: 0.9≤x≤1.3; the range of y is: 1.9≤y≤2; the range of a is: 0.15≤a≤0.75; a and b satisfy the condition a+b=1. The invention prepares a block material with low thermal hysteresis and high density by adding hard magnetic powder to the mixed material containing manganese and iron. The addition of hard magnetic powder effectively changes the phase transition temperature and thermal hysteresis of the magnetic refrigeration material, and prepares A bulk material with low thermal hysteresis, large magnetocaloric effect, and high density is produced, which is beneficial for application in the field of room temperature magnetic refrigeration technology.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a ferromanganese-based magnetic refrigeration material with low thermal hysteresis, and a preparation method and application of the ferromanganese-based magnetic refrigeration material with low thermal hysteresis. Background technique [0002] Refrigeration has become an indispensable part of today's social activities. At present, people mainly use gas expansion / compression refrigeration methods to achieve refrigeration purposes. However, this refrigeration technology has many disadvantages, such as low refrigeration efficiency, high energy consumption, pollution to the environment, and the like. [0003] Magnetic refrigeration is a new technology that uses the disordered-ordered magnetic phase transition of magnetic materials under the action of an external magnetic field to cause the temperature change of the material itself (ie, the magnetocaloric effect) to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01C22C30/00C22C1/04
CPCC22C1/04C22C30/00H01F1/015
Inventor 王高峰谭欣赵增茹李永峰马强
Owner INNER MONGOLIA UNIV OF SCI & TECH
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