Lafesi-based magnetic refrigeration composite material and its preparation method and application

A composite material, magnetic refrigeration technology, applied in 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 transfer, etc., to achieve easy operation in the preparation process. , the raw materials are cheap and easy to obtain, and the preparation process is simple.

Active Publication Date: 2018-10-02
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 its preparation method and application
  • Lafesi-based magnetic refrigeration composite material and its preparation method and application
  • Lafesi-based magnetic refrigeration composite material and its preparation method and application

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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 flakes;

[0061] The alloy ingots or quick-setting flakes are annealed in a vacuum environment or an inert atmosphere, and then quickly quenched in an environment such as liquid nitrogen or ice water to form NaZn 13 LaFeSi-based alloy with type structure;

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

[0063] Put the mixed powder at a pressure of 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℃, and the pressure holding time is 0.5min~10min.

[0064] In t...

Embodiment 1

[0081] Example 1 LaFe is involved in this example 11.6 Si 1.4 H x / Sn magnetic refrigeration composite material preparation and performance study

[0082] (1) Press LaFe 11.6 Si 1.4 Chemical formula ingredients, put into the crucible of vacuum induction rapid solidification furnace, vacuumize and fill with high-purity argon gas until the temperature reaches 1600℃, the raw materials are completely melted, and the alloy liquid is poured on a rotating copper roller with a speed of 1.7m / s. LaFe 11.6 Si 1.4 Quick-setting tablets

[0083] (2) Put the prepared quick-setting sheet into the quartz tube and vacuum to 2×10 -3 Fill the Pa with argon gas of 0.05MPa and seal the tube;

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

[0085] (4) LaFe 11.6 Si 1.4 Put the quick-setting plate into a quartz tube, and then place it in a hydrogen heat treatment furnace, and set the hydrogen charging condi...

Embodiment 2

[0089] Example 2 LaFe is involved in this example 11.6 Si 1.4 H x / Sn magnetic refrigeration composite material preparation and performance study

[0090] Prepare LaFe in the same way as in Example 1. 11.6 Si 1.4 H x / Sn magnetic refrigeration composite material, except that the hot pressing temperature is changed to 233℃.

[0091] 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 maximum magnetic entropy is calculated to become 10.2J / kgK (such as image 3 As shown), the room temperature thermal conductivity measured by the laser thermal conductivity meter is 6.6W / mk (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, a preparation method and application thereof. The LaFeSi-based magnetic refrigeration composite material includes functional body components such as LaFeSi-based alloy particles and matrix components such as low-melting point metals or alloys, and the LaFeSi-based alloy particles are bonded and coated by the matrix components to form a bulk material; The LaFeSi-based alloy particles have a NaZn13 type structure. The present invention uses cheap and easy-to-obtain low-melting-point metals or alloys and LaFeSi-based alloy particles for composite hot-pressing. By selecting suitable low-melting-point components, adjusting pressing pressure, hot-pressing temperature, and holding time, etc., LaFeSi-based magnetic refrigeration with high thermal conductivity can be obtained. Composite materials, the magnetic entropy change is less reduced than before hot pressing, the magnetic hysteresis loss is low, and there is no thermal hysteresis. At the same time, the process is simple and easy to operate, the process conditions are relatively mild, the energy consumption is small, the cost is low, and the repeatability is good. , can be widely used in the 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 have paid more and more attention to environmental protection and energy conservation. The highest efficiency of traditional gas compression refrigeration technology is only 25% of that of the Carnot cycle; the refrigerant Freon used therein destroys the ozone layer in the atmosphere and triggers the greenhouse effect. Therefore, it is particularly urgent to develop a new type of refrigeration technology 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 magnetic refrigeration efficiency ca...

Claims

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Application Information

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Patent Type & Authority Patents(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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