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Lanthanum iron silicon-based magnetic refrigeration material and preparation method thereof

A magnetic refrigeration material, iron-silicon technology, applied in the fields of magnetic materials, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve the problem that the half-height and width of entropy change is not large enough, increase the cost of material preparation and processing, and affect the operation of refrigerators. Stability and other issues, to achieve the effect of wide entropy change half-height width, large entropy change

Active Publication Date: 2019-02-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, this type of first-order phase change compound often only has a large entropy change in a very narrow temperature range (that is, the half-height width of the entropy change is not large enough)
When used in a refrigerator, it is necessary to combine materials with different Curie temperatures into a multi-stage composite magnetic refrigerant, which will greatly increase the cost of material preparation and processing, and even affect the operation stability of the refrigerator.

Method used

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  • Lanthanum iron silicon-based magnetic refrigeration material and preparation method thereof
  • Lanthanum iron silicon-based magnetic refrigeration material and preparation method thereof
  • Lanthanum iron silicon-based magnetic refrigeration material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] La 1-x Ce x Fe 11.4 mn 0.2 Si 1.4 (x=0.3 and 0.4) the preparation method of magnetic refrigeration material is as follows:

[0040] (1) Press La 1-x Ce x Fe 11.4 mn 0.2 Si 1.4 (x=0.3 and 0.4) chemical formula batching, will prepare La, Ce, Fe, Mn, Si raw material and pack in the crucible of vacuum induction quick-setting furnace, vacuumize to 5 * 10 -2 Pa, then filled with high-purity argon 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, the alloy liquid is poured on the rotating copper roller with a speed of 1.7m / s to obtain a quick-setting sheet;

[0041] (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;

[0042] (3) Put the sealed quartz tube in step (2) i...

Embodiment 2

[0046] La 0.7 Ce 0.3 Fe 11.43-a Cr a mn 0.17 Si 1.4 (a=0.1, 0.2 and 0.3) the preparation method of magnetic refrigeration material is as follows:

[0047] (1) Press La 0.7 Ce 0.3 Fe 11.43-a Cr a mn 0.17 Si 1.4 (a=0.1, 0.2 and 0.3) chemical formula ingredients, put the prepared La, Ce, Fe, Cr, Mn, Si raw materials into the crucible of the vacuum induction quick-setting furnace, and evacuate to 5×10 -2 Pa, then filled with high-purity argon 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, the alloy liquid is poured on the rotating copper roller with a speed of 1.7m / s to obtain a quick-setting sheet;

[0048] (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 -4Pa, filled with argon gas of 0.05MPa, and sealed the quartz tube;

[0049] (...

Embodiment 3

[0053] La 0.7 Ce 0.3 Fe 11.35-b Cr 0.05 co b mn 0.2 Si 1.4 h y The preparation method of the magnetic refrigeration material is as follows:

[0054] (1) Press La 0.7 Ce 0.3 Fe 11.35-b Cr 0.05 co b mn 0.2 Si 1.4 (b=0, 0.06, 0.1, 0.15, and 0.2) Chemical formula ingredients, put the prepared La, Ce, Fe, Cr, Co, Mn, Si raw materials into the crucible of the vacuum induction solidification furnace, and evacuate to 5×10 -2 Pa, then filled with high-purity argon 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, the alloy liquid is poured on the rotating copper roller with a speed of 1.7m / s to obtain a quick-setting sheet;

[0055] (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 qua...

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Abstract

The invention provides a lanthanum iron silicon-based magnetic refrigeration material and a preparation method thereof. The chemical general formula of the lanthanum iron silicon-based magnetic refrigeration material is La1-xCexFe13-a-b-c-dCraCobMncSidHy, 0.05<=x<=0.35, 1<=y<=3, 0.01<=a<=0.09, 0.05<=b<=0.35, 0.05<=c<=0.28 and 1<=d<=2. According to the lanthanum iron silicon-based magnetic refrigeration material, LaFel(3-x)Six serves as a basic alloy component, firstly, a proper amount of light rare earth element Ce is adopted for replacing La, the magnetocaloric effect of the material is enhanced, and the cost of the raw materials is reduced; the elements of Mn, Cr and Co are further added to replace Fe, the content of the elements is strictly limited, and Curie temperature and the phase change feature are finely adjusted and regulated; finally, a compound is filled with hydrogen until the content of hydrogen in the compound is saturated, and the magnetic refrigeration material which has the Curie temperature close to the room temperature, a large entropy change and a large entropy change half-height width under a low external magnetic field, and has large adiabatic temperature change at the same time is obtained.

Description

technical field [0001] The invention belongs to the technical field of magnetic refrigeration materials, and in particular relates to a lanthanum-iron-silicon-based magnetic refrigeration material and a preparation method thereof. Background technique [0002] The principle of magnetic refrigeration is to use the magnetocaloric effect of materials, that is, magnetic materials absorb and release heat when they are magnetized and demagnetized by a magnetic field. Compared with traditional compression refrigeration, magnetic refrigeration has the following four advantages: 1) The working medium itself is a solid material and can be used as a heat exchange medium such as aqueous solution, which avoids the damage to the environment caused by the use of chemical refrigerants such as Freon; 2) Due to the use of solid-state magnetic working fluid, the entropy density is significantly higher than that of traditional chemical refrigerants, which facilitates the miniaturization of refr...

Claims

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Application Information

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IPC IPC(8): H01F1/01H01F41/00
CPCH01F1/017H01F41/00
Inventor 张明晓刘剑张一飞闫阿儒孙永阳王占洲
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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