A kind of composite magnetic refrigeration material and preparation method thereof
A magnetic refrigeration material, uniform mixing technology, applied in the fields of magnetic material, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve the problem of not obtaining the magnetic entropy change platform.
Inactive Publication Date: 2018-05-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
However, most of the composite magnetic refrigeration materials have not obtained the magnetic entropy change platform near room temperature.
Method used
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Embodiment 1
[0035] A Gd-Gd with a wide temperature range, a large magnetic entropy change platform, and a large cooling capacity 65 mn 25 Si 10 Composite magnetic refrigeration material, its preparation method is as follows:
[0036] Step 1: Prepare Gd, Mn, and Si elements according to the atomic ratio in the above molecular formula to prepare raw materials (10 g in total), wherein the purity of Gd and Si is 99.9% (mass percentage), and the purity of Mn raw material is more than 99.8% (mass percentage) , Mn is volatile, add 5wt.% balance;
[0037] Step 2: Put the raw materials prepared in Step 1 into the crucible of the melting furnace, and evacuate until the vacuum degree reaches 5×10 - 3 Above Pa, repeated smelting 5 times to obtain Gd with uniform composition 65 mn 25 Si 10 master alloy ingot;
[0038] Step 3: Put 3 to 4 g of the master alloy obtained in Step 2 into a quartz glass tube with a small hole (the diameter of the small hole is 1 to 2 mm), and vacuumize to 8×10 -4 Ab...
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Abstract
The invention discloses a composite magnetic refrigeration material and a preparation method thereof. The Gd-Gd65Mn25Si10 composite magnetic refrigeration material is prepared by mixing metal Gd powder with different particle sizes, a Gd65Mn25Si10 amorphous sheet of which the length is smaller than 76 microns and a little of spherical low-melting-point metal Sn powder evenly and then carrying out warm compaction; and the weight ratio of the metal Gd powder to the Gd65Mn25Si10 amorphous sheet is 3:7. The prepared bulk composite material has the characteristics of high density and excellent mechanical property, and good heat-conducting property and magnetocaloric property of the bulk composite material can be ensured. The composite material Gd-Gd65Mn25Si10 keeps a platform area with an invariable maximum magnetic entropy change value 2.92J / (kg K) (0-5T) in a temperature interval 88K (199-287K), and is suitable for application in a magnetic ericsson cycle in a room-temperature zone.
Description
technical field [0001] The present invention relates to a metal Gd and Gd 65 mn 25 Si 10 The magnetic refrigeration material composited by amorphous alloy, especially relates to the block composite magnetic refrigeration material with large magnetic entropy change platform and large refrigeration capacity prepared by warm pressing molding method and its preparation method. Background technique [0002] Compared with the gas compression refrigeration technology commonly used at present, magnetic refrigeration technology has become the most promising refrigeration technology in the future due to its advantages of high efficiency, energy saving, environmental protection, small size, long life, safety and reliability. The magnetocaloric effect is an inherent characteristic of magnetic materials, which is caused by the change of the magnetic entropy of the material itself due to the change of the external magnetic field, accompanied by the release and absorption of heat. Magne...
Claims
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IPC IPC(8): H01F1/01H01F41/02C22C45/00C22C28/00
CPCC22C28/00C22C45/00H01F1/015H01F1/017H01F41/0266
Inventor 钟喜春沈小艳刘仲武焦东玲邱万奇
Owner SOUTH CHINA UNIV OF TECH