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Ferromanganese-based magnetic refrigeration material with low heat stagnation and preparation method and application thereof

A magnetic refrigeration material, ferromanganese technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of reducing effective refrigeration capacity and limiting applications

Active Publication Date: 2020-03-13
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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  • Ferromanganese-based magnetic refrigeration material with low heat stagnation and preparation method and application thereof
  • Ferromanganese-based magnetic refrigeration material with low heat stagnation and preparation method and application thereof

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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 heat stagnation and a preparation method and application thereof. The ferromanganese-based magnetic refrigeration material with low heat stagnation is prepared by sintering hard magnetic powder and mixed powder containing manganese and iron. The hard magneticpowder is composed of one or more of neodymium iron boron, samarium cobalt and samarium iron nitrogen hard magnets. The molar ratio of the mixed powder meets the chemical general formula MnxFey-xPaSib, and x is more than or equal to 0.9 and less than or equal to 1.3, y is greater than or equal to 1.9 and less than or equal to 2, a is more than or equal to 0.15 and less than or equal to 0.75, a and b meet the condition that a + b is equal to 1. Through adding hard magnetic powder into a mixed material containing manganese and iron, the block material with low heat stagnation and high density is prepared, the phase change temperature and heat stagnation of the magnetic refrigeration material are effectively changed by adding the hard magnetic powder, the block material with low heat stagnation, large magnetocaloric effect and high density is prepared, and the preparation method is beneficial to being applied to the technical field of room-temperature magnetic refrigeration.

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 Applications(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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