High-throughput preparation method for LaFeSi-based magnetic refrigeration material

A magnetic refrigeration material and high-throughput technology, applied in manufacturing tools, heat treatment equipment, casting molding equipment, etc., can solve the problems of long production cycle, low efficiency of preparation method, unreliable comparison results, etc., and achieve good magnetocaloric effect

Active Publication Date: 2019-01-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be said that La(Fe,Si) 13 Magnetic refrigeration materials have shown great application prospects, but the formation of a single bulk NaZn 13 type structure La(Fe,Si) 13 Compounds need to be annealed at high temperature for seven days or even weeks, which not only wastes energy, but also has an extremely long production cycle, which greatly restricts its industrial application
[0006] Some studies have pointed out that the rapid solidification process can shorten the La(Fe,Si) 13 The preparation cycle of magnetic refrigeration materials, but the research on the cooling rate is limited to the research under fixed solidification conditions, that is, a study on the solidification under a fixed cooling environment, but the efficiency of this one-furnace preparation method Low, and the volatilization of melt elements in different smelting environments is also different, which may easily cause unreliable comparison results

Method used

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  • High-throughput preparation method for LaFeSi-based magnetic refrigeration material
  • High-throughput preparation method for LaFeSi-based magnetic refrigeration material
  • High-throughput preparation method for LaFeSi-based magnetic refrigeration material

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Experimental program
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Embodiment 1

[0040] In this embodiment, the molecular formula of the LaFeSi-based magnetic refrigeration alloy material is LaFeSi 11.6 Si 1.4 .

[0041] The high-throughput preparation method of the above-mentioned LaFeSi-based magnetic refrigeration material is as follows:

[0042] Step 1: According to the molecular formula LaFe 11.6 Si 1.4 Raw materials La, Fe, and Si are batched, specifically: the alloy atomic percentage is converted into mass percentage, and La, Fe, and Si are weighed in proportion, and the purity of each raw material is greater than 99%;

[0043] Step 2: Put the raw materials prepared in step 1 into the electric arc melting furnace, and vacuum the furnace body to 1×10 -5 ~5×10 -5 After the mbar is filled with argon until the pressure is 400-800mbar, the raw material is heated and smelted. After the raw material is completely melted, the smelting is continued for 2-10 minutes, and then cooled until solidified. Repeat smelting for 3 to 5 times to obtain an alloy i...

Embodiment 2

[0055] In this embodiment, the molecular formula of the LaFeSi-based magnetic refrigeration alloy material is La 1.7 Fe 11.6 Si 1.4 .

[0056] The preparation method of the above-mentioned LaFeSi-based magnetic refrigeration material is as follows:

[0057] Step 1: According to the molecular formula La 1.7 Fe 11.6 Si 1.4 Raw materials La, Fe, and Si are batched, specifically: the alloy atomic percentage is converted into mass percentage, and La, Fe, and Si are weighed in proportion, and the purity of each raw material is greater than 99%;

[0058] Step 2: Put the raw materials prepared in step 1 into the discharge arc melting furnace, and evacuate the furnace body to 1×10 -5 ~5×10 - 5 After mbar, fill with argon until the pressure is 400-800mbar, heat and melt the raw material, after the raw material is completely melted, continue to smelt for 2-10 minutes, then cool to solidify, quickly turn it over and repeat the smelting for 3-5 times to obtain a uniform composition...

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Abstract

The invention discloses a high-throughput preparation method for a LaFeSi-based magnetic refrigeration material. According to the method, in the process of casting an alloy ingot from material melt, awedged copper mold is adopted, so the cooling rate of the melt along the height direction is in gradient change, the wedged alloy ingot with a solidified alloy structure gradient is obtained; and annealing is then carried out, and the magnetothermal effect of the obtained LaFeSi-based blocky magnetic refrigeration material with a NaZn13 structure has a gradient. Preferably, by utilizing microstructures obtained by a scanning electron microscope characterizing different cooling rates in the same sample at high throughput, in combination with a magnetothermal performance test, a corresponding relation between different structures, magnetothermal effect and copper mold width is obtained, which can be used for rapidly screening needed sample preparation parameters and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a high-throughput preparation method of a LaFeSi-based magnetic refrigeration material. Background technique [0002] With the development of modern society, refrigeration technology plays a vital role in improving people's living standards and working environment. Refrigeration appliances such as refrigerators and air conditioners have entered every household. According to statistics, the annual energy consumption of the refrigeration industry accounts for more than 15% of the total energy consumption of the whole society. The highest efficiency of the currently commonly used gas compression refrigeration technology is only 25%, and it has the disadvantages of emitting harmful gases, loud noise, and large volume. Therefore, exploring environmentally friendly, efficient and energy-saving new refrigeration technology has become an urgent problem to be solved. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/06B22C9/22C21D1/18C21D1/26C21D1/74C21D6/00C21D9/00C22C33/04C22C38/02
CPCB22C9/06B22C9/22C21D1/18C21D1/26C21D1/74C21D6/008C21D9/0068C22C33/04C22C38/005C22C38/02
Inventor 刘剑欧阳亦张明晓闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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