LA(FE,SI)13-BASED MAGNETIC REFRIGERATION MATERIAL PREPARED FROM INDUSTRIAL-PURE MISCHMETAL AS THE RAW MATERIAL AND PREPARATION AND USE THEREOF
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United States of America Patent
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Jun 19, 2014
app pub date -
Jul 13, 2012
filing date -
Jul 14, 2011
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The invention provides a La(Fe,Si)13-based magnetic refrigeration material prepared from industrial-pure mischmetal as the raw material, wherein the industrial-pure mischmetal is impurity-containing and naturally proportionated La—Ce—Pr—Nd mischmetal or LaCe alloy which, as the intermediate product during rare earth extraction, is extracted from light rare earth ore. The invention further provides the preparation method and use of the material, wherein the preparation method comprises the steps of smelting and annealing industrial-pure mischmetal as the raw material to prepare the La(Fe,Si)13-based magnetic refrigeration material. The presence of impurities in the industrial-pure mischmetal has no impact on the formation of the 1:13 phase, the presence of the first-order phase-transition property and metamagnetic behavior, and thus maintains the giant magnetocaloric effect of the magnetic refrigeration material. The preparation of La(Fe,Si)13-based magnetic refrigeration material from industrial-pure mischmetal reduces the dependency on high-purity elementary rare earth raw material; lowers the cost for manufacturing the material; and thus plays an important role in development of the magnetic refrigeration application of materials.
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