| 简介 |
PROBLEM TO BE SOLVED : To improve magnetization and to reduce cost by increasing an Fe concentration in an Sm-Co system magnet which is excellent in thermal resistance while maintaining a crystal structure or the like which provides a magnet property. SOLUTION : The permanent magnet has a composition expressed by a formula : Rx(FepMqSirCusCo1-p-q-r-s)100-x, where R is at least one element selected from rare earth elements containing Y; M is at least one element selected from Ti, Zr, and Hf; x is a number which satisfies 8≤x≤20 atom%; p, q, r, and s are numbers which satisfy, by an atomic ratio, 0.3≤p≤0.6, 0.005≤q≤0.1, 0.005≤q≤0.1, 0.005≤s≤0.15, respectively. The permanent magnet has an organization which is mainly composed of a Th2Zn17type crystal phase and a CaCu5type crystal phase. COPYRIGHT : (C)2010, JPO&INPIT |
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