Rare earth-iron-silicon-based magnetic refrigeration composite material and preparation method thereof

A composite material and magnetic refrigeration technology, which is applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve problems such as difficulty in forming a continuous network structure, high density of copper metal, and poor mechanical properties , to achieve the effects of increased thermal resistance at the interface between particles, low cost, enhanced thermal conductivity and mechanical properties

Active Publication Date: 2019-03-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the presence of organic polymer binders and pores, the thermal conductivity of such composites is generally poor, even several times lower than that of the corresponding dense bulk alloys before bonding.
[0005] Chinese patent application (publication number CN105957672A) discloses a lanthanum-iron-silicon-based hydride magnetic working fluid and its preparation method. Good performance, solves the problems of poor mechanical properties such as pulverization and brittleness after hydrogenation of lanthanum-iron-silicon-based compounds
Due to the elimination of grain boundaries, the mechanical properties of porous materials are better than those of bulk alloys in the process of magnetic field cycling, but the density of copper metal itself is very high, and it occupies a small volume fraction in composite materials, so it is difficult to form a continuous network structure. rate is still significantly less than that of the corresponding dense bulk alloy

Method used

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  • Rare earth-iron-silicon-based magnetic refrigeration composite material and preparation method thereof
  • Rare earth-iron-silicon-based magnetic refrigeration composite material and preparation method thereof
  • Rare earth-iron-silicon-based magnetic refrigeration composite material and preparation method thereof

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preparation example Construction

[0058] In some more specific embodiments, the preparation method includes the following steps:

[0059] (1) According to its general chemical formula R x (Fe 1-a-b co a mn b ) 13-y Si y A z Prepare raw materials (convert alloy atomic percent to mass percent, then weigh raw materials). When A includes hydrogen, prepare raw materials other than hydrogen according to the general chemical formula;

[0060] (2) Place the prepared raw materials in a smelting furnace, and smelt them under the protection of high-purity inert gas to obtain alloy ingots; or place the raw materials in a vacuum induction quick-setting furnace, and melt the alloy liquid Pouring on a rotating copper roller to prepare quick-setting sheets;

[0061] (3) anneal the material prepared in step (2) in vacuum or inert gas, and then quench rapidly to obtain 13 The rare earth-iron-silicon-based alloy of the type crystal structure, the operation of the step (2) and the step (3) are all realized by those skill...

Embodiment 1

[0068] Example 1LaFe 11 co 0.8 Si 1.2 / Al (Al content 10wt.%) magnetic refrigeration composite material

[0069] (1) Press LaFe 11 co 0.8 Si 1.2 Chemical formula ingredients, put the prepared La, Fe, Co, Si raw materials into the crucible of the vacuum induction quick-setting furnace, and evacuate to 5×10 -2 Pa, after filling with high-purity argon (99.999% or more) to 0.05MPa. Turn on the intermediate frequency power supply, heat for a period of time, and start to smelt the metal. After the raw materials are completely melted and kept warm for 5 minutes, pour the alloy liquid onto the rotating copper roller with a speed of 1.7m / s to obtain LaFe 11 co 0.8 Si 1.2 quick-setting tablets;

[0070] (2) Break the quick-setting sheet obtained in step (1), then wrap it with a Mo sheet and put it into a quartz tube, and vacuumize it to 1×10 -4 Pa, filled with argon gas of 0.05MPa, and sealed the quartz tube;

[0071] (3) Put the sealed quartz tube in step (2) into a muffle f...

Embodiment 2

[0081] Three, test the LaFe that step (5) makes with electronic universal testing machine 11 co 0.8 Si 1.2 / Al composites room temperature compressive strength. Figure 5 Typical stress-strain curves of hot-pressed samples at 400°C, 500°C, 600°C and 700°C are given, from Figure 5 It can be seen that the stress-strain curve of each sample approximately satisfies the linear relationship at the initial stage of loading, and is in the elastic deformation zone, and then the stress rises very slowly with the strain, presenting a very narrow approximate platform zone, and then falls, and the sample is destroyed. The fracture strength of the samples increases first and then decreases with the increase of the hot-pressing temperature. Among them, the fracture strength of the samples hot-pressed at 600℃ is the highest, reaching 186MPa. The high strength of the hot-pressed sample may come from the reinforcement effect of the micro-thick reaction layer. Example 2LaFe 11 co 0.8 Si ...

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Abstract

The invention provides a rare earth-iron-silicon-based magnetic refrigeration composite material and a preparation method thereof. The rare earth-iron-silicon-based magnetic refrigeration composite material comprises a functional body component and a matrix component. The functional body component comprises rare earth-iron-silicon-based alloy particles, the matrix component comprises an aluminum metal element or aluminum alloy, and the rare earth-iron-silicon-based alloy particles are bonded by the matrix component to form a bulk material or the reactant of the functional body component and the matrix component are bonded to form the bulk material. The composite material has the advantages that a high magnetocaloric effect, good thermal performance and god mechanical performance are simultaneously maintained, the machine shaping is facilitated, the composite material is not powdered in when the composite material is in hydrogenation processing or is used in a refrigerating machine, andthe shape remains intact.

Description

technical field [0001] The invention relates to a magnetic refrigeration material, in particular to a rare earth-iron-silicon-based magnetic refrigeration composite material and a preparation method thereof, belonging to the field of magnetic refrigeration materials. Background technique [0002] At present, refrigeration technology has penetrated into various fields of people's daily life and industrial production activities, from daily clothing, food, housing, transportation, to scientific research fields are inseparable from refrigeration technology. In the technical field of general cooling, vapor compression refrigeration has been developed since the 1870s and has a history of nearly 150 years. It is currently one of the most well-developed and most widely used refrigeration methods. However, the efficiency of the vapor compression refrigerator is only about 40% of the efficiency of the Carnot cycle, and the commonly used freon refrigerants discharged into the atmospher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/02C22C38/10C22C38/04C22C38/02C22C33/02
CPCC22C33/0264C22C38/002C22C38/005C22C38/02C22C38/04C22C38/10H01F1/015H01F41/02
Inventor 张明晓刘剑张恒闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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