Method for improving magnetocaloric performance of LaFeSi through adding low-melting-point LaAl

A low melting point phase and performance technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of long preparation cycle, increased cost, difficult to process and shape, shorten annealing time, reduce sample preparation cycle and cost , the effect of excellent magnetocaloric performance

Inactive Publication Date: 2018-07-31
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Preparation of LaFe by traditional smelting method 13-x Si x Alloys require long-term high-temperature heat treatment, which not only has a long preparation cycle and increased costs, but is also difficult to process and shape

Method used

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  • Method for improving magnetocaloric performance of LaFeSi through adding low-melting-point LaAl
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  • Method for improving magnetocaloric performance of LaFeSi through adding low-melting-point LaAl

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Embodiment Construction

[0026] (1) Sample preparation: Proportion LaFe respectively according to the stoichiometric method 11.85 Si 1.15 Alloy and La 0.77 al 0.23 Alloy, using elemental La with a purity of 99.5% or more, Fe with a purity of 99.95% or more, Si with a purity of 99.9% or more, and Al with a purity of 99.996% or more. Among them, the La block needs to be polished and cleaned with ultrasonic vibration before use. 20 min to remove the oxide on the surface. In order to compensate for the loss of La during the smelting process, it is generally necessary to add an additional 5 wt.% La when preparing samples;

[0027] (2) Smelting: Put the prepared elemental elements into a high vacuum water-cooled copper crucible electric arc furnace for smelting. When the vacuum reaches 1.0×10 -3 After Pa is below, it is filled with high-purity Ar at an atmospheric pressure. When smelting, it is necessary to melt the block first to make it absorb the residual oxygen in the furnace, and repeatedly smelt...

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Abstract

The invention relates to a method for improving the magnetocaloric performance of LaFeSi through adding low-melting-point LaAl. The method comprises the steps of (1) selection of elemental elements: proportioning a LaFe<13-x>Si<x> (x=1.0-1.6) alloy and a La<0.77>Al<0.23> alloy according to a stoichiometric method separately; (2) electric arc smelting: carrying out electric arc smelting on preparedraw materials in high-purity Ar atmosphere separately, wherein an alloy specimen needs to be repeatedly smelted for 5-6 times to ensure that ingredients are uniform; (3) melt quenching: manufacturingthe smelted alloys into ribbons in the high-purity Ar atmosphere through a melt quenching technology; (4) mechanical mixing: grinding two alloy ribbons into powder and mixing the powder evenly through a mixer at a certain ratio; (5) spark plasma sintering (SPS): manufacturing the mixed powder into blocks by using a spark plasma sintering technology; and (6) thermal treatment: carrying out high-temperature annealing and water quenching treatment on a manufactured spark plasma sintered magnet.

Description

technical field [0001] The invention relates to the preparation and property research of LaFeSi magnetic refrigeration alloy, in particular to a method for improving the magnetic-caloric performance of LaFeSi by adding LaAl low melting point phase. Background technique [0002] With the development of science and technology and the progress of society, the application of refrigeration technology is becoming wider and wider. From daily life such as industrial and agricultural production, construction, medical and health care and food processing to cutting-edge scientific and technological fields such as national defense, electronic machinery and modern science, all reflect the importance of refrigeration technology. The refrigeration technology currently used is mainly traditional gas compression refrigeration. However, gas compression refrigeration not only has low refrigeration efficiency and high energy consumption, but more importantly, the Freon refrigerant used in gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01H01F41/02C22C38/02C22C38/06B22F9/04B22F3/105B22F3/24
CPCH01F1/015B22F3/105B22F3/24B22F9/04B22F2003/248B22F2998/10C22C38/005C22C38/02C22C38/06H01F41/02
Inventor 黄有林范文兵石志强侯育花
Owner NANCHANG HANGKONG UNIVERSITY
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