METHOD FOR INCREASING COERCIVE FORCE OF MAGNETS

PROBLEM TO BE SOLVED: To provide a method for improving coercive force of magnets.SOLUTION: The method comprises: a coating step S2) of coating a coating material on a surface of a magnet and drying it; and an infiltrating step S3) of heat treating the magnet obtained from the coating step S2). The...

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Main Authors WANG YICHUAN, DONG YI, YI HAIBO, HU ZHANJIANG, WU SHUJIE, YUAN WENJIE, YUAN YI, CHEN YA, MIAO JUCHANG, DIAO SHULIN
Format Patent
LanguageEnglish
Japanese
Published 07.07.2016
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Summary:PROBLEM TO BE SOLVED: To provide a method for improving coercive force of magnets.SOLUTION: The method comprises: a coating step S2) of coating a coating material on a surface of a magnet and drying it; and an infiltrating step S3) of heat treating the magnet obtained from the coating step S2). The coating material comprises (1) metal calcium particles and (2) particles of a material containing a rare earth element. The rare earth element is at least one selected from praseodymium, neodymium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. The method of the present invention can significantly increase coercive force of a permanent magnet material, while remanence and magnetic energy product hardly decrease. In addition, the method of the present invention can significantly decrease the amount of a rare earth element, and accordingly, decrease the production cost.SELECTED DRAWING: None 【課題】本発明は磁石の保磁力を向上させる方法を提供する。【解決手段】該方法は、下記工程:塗布材を磁石の表面に塗布して乾燥させる塗布工程S2)と、塗布工程S2)から得られた磁石を熱処理する浸透工程S3)とを含む。前記塗布材は(1)金属カルシウム粒及び(2)希土類元素を含有する物質の粒を含み、前記希土類元素は、プラセオジム、ネオジム、ガドリニウム、テルビウム、ジスプロシウム、ホルミウム、エルビウム、ツリウム、イッテルビウム、及びルテチウムから選択される少なくとも1種である。本発明の方法は、永久磁石材料の保磁力を大幅に向上させるとともに、残留磁束密度及び磁気エネルギー積の低下が割りと少ない。また、本発明の方法は、希土類元素の使用量を大幅に減少し、生産コストを低減することができる。【選択図】 なし
Bibliography:Application Number: JP20160042723