| 摘要 |
<P>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. <P>SOLUTION: The permanent magnet has a composition expressed by a formula: R<SB>x</SB>(Fe<SB>p</SB>M<SB>q</SB>Si<SB>r</SB>Cu<SB>s</SB>Co<SB>1-p-q-r-s</SB>)<SB>100-x</SB>, 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 Th<SB>2</SB>Zn<SB>17</SB>type crystal phase and a CaCu<SB>5</SB>type crystal phase. <P>COPYRIGHT: (C)2010,JPO&INPIT |
