METHOD FOR PRODUCING R-T-B SINTERED MAGNET

文件类型：PDF文档
文件大小：638K
This method for producing an R-T-B sintered magnet includes : a step of preparing an R-T-B sintered magnet body in which the quantity of R, which is defined by the rare metal content, is 31 mass% to 37 mass%, inclusive; a step of preparing an RH diffusion source containing a heavy rare earth element RH (at least one of Dy and Tb) and 30 mass% to 80 mass%, inclusive, of Fe; a step in which the sintered magnet body and the RH diffusion source are charged into a processing chamber in a manner permitting relative movement, and in close proximity to or contacting one another; and an RH diffusion step in which the sintered magnet body and the RH diffusion source are heated to a process temperature of 700ºC to 1000 ºC, inclusive while the sintered magnet body and the RH diffusion source are moved continuously or intermittently within the processing chamber.