R-Fe-B RARE EARTH SINTERED MAGNET

文件类型：PDF文档
文件大小：523K
Disclosed is an R-Fe-B rare earth sintered magnet which comprises, as the main phase, an R2Fe14B compound crystal grain containing a light rare earth element Nd as the main rare earth element R. This R-Fe-B rare earth sintered magnet contains a heavy rare earth element RH (RH is at least one of Dy and Tb) introduced therein by diffusion from the surface. The concentration of the heavy rare earth element RH in the R-rich phase at the grain boundary is regulated so that it is lower than the concentration of the heavy rare earth element RH in the surface of the R2Fe14B compound crystal grain, but higher than the concentration of the heavy rare earth element RH in the central portion of the R2Fe14B compound crystal grain.COPYRIGHT KIPO & WIPO 2010