| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an R-T-B based permanent based magnet easily applicable to the actual manufacture of an R-T-B based permanent based magnet, and having an effective plating film to secure a hardness. <P>SOLUTION: The R-T-B based permanent based magnet 1 has a magnet element 2 composed of a sintered compact including at least a main-phase crystal grain comprising an R<SB>2</SB>T<SB>14</SB>B compound, and an intergranular phase containing more R than in the main-phase crystal grain; and a plating film 3 formed by an electrolytic Cu plating method for coating the surface of the magnetic element 2, and satisfied with the following inequality 0.005<Cc≤0.025 (wt.%) when content of C is represented as Cc (wt.%). In the R<SB>2</SB>T<SB>14</SB>B compound, R is one or more kinds of rare-earth elements including Y, and T is one or more kinds of transition metals indispensable of Fe or Fe and Co. <P>COPYRIGHT: (C)2009,JPO&INPIT |
