Method for preparing polymer-bonded magnetic refrigerating composite material

A composite material and magnetic refrigeration technology, which is applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of reduced magnetic properties and weak bonding force of magnetocaloric alloys, and achieve strong bonding force, low cost, and simple process Effect

Inactive Publication Date: 2012-11-07
XIAN JIAWEN MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their cold-extruded composite materials have weak bonding force between metal particles, an

Method used

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  • Method for preparing polymer-bonded magnetic refrigerating composite material
  • Method for preparing polymer-bonded magnetic refrigerating composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, LaFe is prepared by coating metal particles with high thermal conductivity epoxy resin. 11 co 0.8 Si 1.2 alloy composites.

[0016] The composition is LaFe smelted by arc method 11 co 0.8 Si 1.2 Cast ingots, cut into small pieces, keep warm at 1050 degrees Celsius for 7 days in an argon atmosphere of 0.8 mbar, and then quench into water at room temperature. The small pieces after annealing are mechanically ground into fine particles with uniform size distribution, and the particle size is controlled between 10-100 microns. Mix the particles and high thermal conductivity epoxy resin in a polyethylene plastic container at a volume ratio of 10:1, stir evenly with a copper needle, and inject it into a copper mold. The mold was placed in a vacuum dish for degassing for 5 minutes, and then the mold was placed in a magnetic field composed of permanent magnets with a magnetic field strength of 1 Tesla. After standing for 1 week, the mold was opened to...

Embodiment 2

[0019] In this example, the method of coating metal particles with high thermal conductivity epoxy resin is used to prepare Mn 1.1 Fe 0.9 P 0.75 Ge 0.25 alloy composites.

[0020] Use Mn, Fe, P, Ge high-purity metal powder (purity greater than 99.9%) by Mn 1.1 Fe 0.9 P 0.75 Ge 0.25 The components were ball-milled for 10 hours by mechanical alloying, kept at 1000 degrees Celsius for 2 days in an argon atmosphere of 0.8 mbar, and then cooled to room temperature in the furnace. Grinding the annealed alloy into particles, the particle size is controlled between 10-100 microns. Mix the particles and high thermal conductivity epoxy resin in a polyethylene plastic container at a volume ratio of 10:1, stir evenly with a copper needle, and inject it into a copper mold. The mold was placed in a vacuum dish for degassing for 5 minutes, and then the mold was placed in a magnetic field composed of permanent magnets with a magnetic field strength of 1 Tesla. After standing for 1 we...

Embodiment 3

[0023] In this example, Ni was prepared by coating metal particles with high thermal conductivity epoxy resin. 49 mn 27 Ga 24 alloy composites.

[0024] The composition is Ni by arc melting 49 mn 27 Ga 24 Cast ingots, cut into small pieces, keep warm at 1100 degrees Celsius for 7 days in an argon atmosphere of 0.8 mbar, and then quench them into water at room temperature. The annealed small pieces are mechanically ground into particles, and the particle size is controlled at 10-100 microns. Mix the particles and high thermal conductivity epoxy resin in a polyethylene plastic container at a volume ratio of 10:1, stir evenly with a copper needle, and inject it into a copper mold. The mold was placed in a vacuum dish for degassing for 5 minutes, and then the mold was placed in a magnetic field composed of permanent magnets with a magnetic field strength of 1 Tesla. After standing for 1 week, the mold was opened to take out the cured composite material.

[0025] Heusler-ty...

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Abstract

The invention belongs to the technical field of magnetic refrigerating materials and particularly relates to a method for preparing polymer-bonded magnetic refrigerating composite material, which is characterized in that room-temperature magnetic refrigerating alloy particles including iron-based, manganese-based, nickel-based or gadolinium-based particles are mechanically mixed with a resin with high thermal conductivity, and a polymer is cured in magnetic field to obtain the oriented arrangement with alloy particle embedded, wherein alloy particles account for 50-98% of the total volume. The magnetic refrigerating composite block material has high magneto-thermal performance, large magneto-crystalline anisotropy and large magneto-thermal anisotropy and also has low vortex loss when being used at high frequency. The compressive toughness of the magnetic refrigerating composite block material is improved by 1 to 2 orders of magnitude than that of the existing magnetic refrigerating alloy. The process for preparing the polymer-bonded magnetic refrigerating composite material is simple, the complex profiles in near net shapes can be obtained, the steps of cutting and processing are omitted, and industrial mass production is easy to realize.

Description

Technical field: [0001] The invention relates to the technical field of magnetic refrigeration materials, in particular to a method for preparing magnetic refrigeration composite materials bonded by polymers. Background technique: [0002] Traditional magnetic refrigerators achieve refrigeration by compressing gas expansion technology. Among them, Freon or hydrofluorocarbon is used as the compressed gas. Both gases are damaging to the atmosphere, can damage the atmospheric ozone layer or have a greenhouse effect. The magnetic refrigeration technology developed in recent years achieves the purpose of refrigeration through the change of magnetic entropy of materials in the process of magnetization and demagnetization. Because this solid material refrigeration technology does not use compressed gas, it will not cause the greenhouse effect, and is called a green environmental protection refrigeration technology. In addition, compared with gas refrigeration systems, magnetic r...

Claims

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Application Information

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IPC IPC(8): B22F1/02C09K5/14
Inventor 刘剑夏明许
Owner XIAN JIAWEN MATERIAL TECH
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