LaFeSi based magnetic refrigeration composite material and preparation method and application thereof

A composite material and magnetic refrigeration technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of affecting materials, low thermal conductivity of materials, affecting magnetic working medium and fluid heat exchange, etc., and achieves easy operation in the preparation process , raw materials are cheap and easy to obtain, and the preparation process is simple

Active Publication Date: 2017-06-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its large-scale application is limited by the immature preparation and processing technology
At present, many resin-bonded LaFeSi-based composite materials have been reported. Although the mechanical properties of the material are improved after molding, because the low thermal conductivity resin will affect the thermal conductivity of the material, even if silver particles with high thermal conductivity are added to the resin, after bonding The thermal conductivity of the material is also generally low, which affects the heat exchange between the magnetic working medium and the fluid, reducing the refrigeration efficiency, and the density of the resin is extremely small, generally only 1 to 2g / cm 3 , will significantly reduce the magnetic entropy change per unit volume, which is not conducive to the compact structure of the device (refer to CN 104694813A; Applied Physics Letters, 104(6): 062407, 2014; Journal of Magnetism and Magnetic Materials, 375:65-73, 2015)

Method used

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  • LaFeSi based magnetic refrigeration composite material and preparation method and application thereof
  • LaFeSi based magnetic refrigeration composite material and preparation method and application thereof
  • LaFeSi based magnetic refrigeration composite material and preparation method and application thereof

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preparation example Construction

[0058] In some embodiments, the preparation method includes:

[0059] Prepare raw materials other than H according to the chemical formula of the LaFeSi-based alloy particles;

[0060] Melting the raw materials under the protection of high-purity inert gas to form alloy ingots or quick-setting tablets;

[0061] The alloy ingot or quick-setting sheet is annealed in a vacuum environment or an inert atmosphere, and then rapidly quenched in an environment such as liquid nitrogen or ice water to form a NaZn 13 Type structure LaFeSi-based alloy;

[0062] Breaking the LaFeSi-based alloy into particles with a particle size ≤ 250 μm, and mixing it with a low melting point metal or alloy to form a mixed powder;

[0063] Put the mixed powder under pressure at 8×10 -2 Hot press molding in a high vacuum environment below Pa or in an inert atmosphere, the pressing pressure is 50MPa-1GPa, the hot-pressing temperature is 180-300°C, and the holding time is 0.5min-10min.

[0064] In the pre...

Embodiment 1

[0081] Embodiment 1 This embodiment involves LaFe 11.6 Si 1.4 h x Preparation and Properties of Sn / Sn Magnetic Refrigeration Composite

[0082] (1) Press LaFe 11.6 Si 1.4 The chemical formula ingredients are put into the crucible of the vacuum induction quick-setting furnace, and then filled with high-purity argon gas after vacuuming. When the temperature reaches 1600°C, the raw materials are completely melted, and the alloy liquid is poured on the rotating copper roller with a speed of 1.7m / s. Preparation LaFe 11.6 Si 1.4 quick-setting tablets;

[0083] (2) Put the prepared quick-setting sheet into the quartz tube and vacuumize to 2×10 -3 After Pa, fill with 0.05MPa argon, and seal the tube;

[0084] (3) Put the sealed quartz tube into a muffle furnace, heat it to 1050°C, keep it warm for 24 hours, and quench it with a mixture of ice and water;

[0085] (4) LaFe 11.6 Si 1.4 Put the quick-setting sheet into the quartz tube, then put it in the hydrogen heat treatment...

Embodiment 2

[0089] Embodiment 2 This embodiment involves LaFe 11.6 Si 1.4 h x Preparation and Properties of Sn / Sn Magnetic Refrigeration Composite

[0090] LaFe is prepared in the same way as in Example 1 11.6 Si 1.4 h x / Sn magnetic refrigeration composites, except that the hot-pressing temperature was changed to 233°C.

[0091] The LaFe obtained in this embodiment 11.6 Si 1.4 h x The Curie temperature of the / Sn magnetic refrigeration composite material is 281K, and the calculated maximum magnetic entropy becomes 10.2J / kgK (such as image 3 shown), the thermal conductivity at room temperature measured by the laser thermal conductivity meter is 6.6W / mk (such as Image 6 shown), the compressive strength measured by the universal testing machine is 173MPa (such as Figure 8a shown).

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Abstract

The invention discloses a LaFeSi based magnetic refrigeration composite material and a preparation method and application thereof. The LaFeSi based magnetic refrigeration composite material comprises functional body components such as LaFeSi based alloy particles and matrix components such as low-melting-point metal or alloy, and the LaFeSi based alloy particles are bonded and coated by the matrix components to form a bulk material; and the LaFeSi based alloy particles are of a NaZn13 type structure. According to the LaFeSi based magnetic refrigeration composite material and the preparation method and application thereof, composite hot pressing is conducted between the cheap and easily-obtained low-melting-point metal or alloy and the LaFeSi based alloy particles, the appropriate low-melting-point components are selected, the pressing pressure, the hot pressing temperature, the pressure maintaining time and the like are adjusted, and thus the high-thermal-conductivity LaFeSi based magnetic refrigeration composite material can be obtained; the magnetic entropy change of the LaFeSi based magnetic refrigeration composite material is less reduced compared with that before hot pressing, the magnetic hysteresis loss is low, and thermal hysteresis is avoided; and in addition, the process is simple and easy to operate, the process conditions are relatively mild, energy consumption is little, the cost is low, the repeatability is good, and the preparation method can be widely used in preparation of magnetic refrigeration materials.

Description

technical field [0001] The invention relates to a magnetic refrigeration material, in particular to a LaFeSi-based magnetic refrigeration composite material and a preparation method and application thereof, belonging to the field of magnetic refrigeration materials. Background technique [0002] In recent years, people pay more and more attention to environmental protection and energy conservation. The highest efficiency of traditional gas compression refrigeration technology only reaches 25% of the Carnot cycle; the refrigerant Freon used in it destroys the ozone layer in the atmosphere and causes the greenhouse effect. Therefore, it is particularly urgent to develop new refrigeration technologies with low energy consumption, high efficiency and no pollution to the environment. [0003] Among the new refrigeration technologies, magnetic refrigeration has the following advantages: (1) High efficiency and energy saving. The highest magnetic refrigeration efficiency can reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C33/02C09K5/14
CPCC09K5/14C22C33/02C22C38/005C22C38/008C22C38/02
Inventor 刘剑张恒张明晓邵艳艳闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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