R-FE-B TYPE RARE EARTH SINTERED MAGNET AND PROCESS FOR PRODUCTION OF THE SAME

摘要

An R-Fe-B type rare earth sintered magnet in which the R2Fe14B type compound grains present at a depth of 20µm from the surface of the magnet have each an outer skin layer of (RL1-xRHx)2Fe14B (wherein 0.2=x=0.75) having a thickness of 1nm to 2µm (wherein RL is at least one light rare earth element selected from between Nd and Pr; and RH is at least one heavy rare earth element selected from the group consisting of Dy, Ho and Tb).