R a-T a-B based sintered magnet

文件类型：PDF文档
文件大小：995K
A method for manufacturing an R-T-B based sintered magnet includes : 1) a step of preparing an R-T-B based sintered magnet material by sintering a molded body at a temperature of 1, 000° C. or higher and 1, 100° C. or lower, and then performing (a) temperature dropping to 500° C. at 10° C./min or less, or (b) temperature dropping to 500° C. at 10° C./min or less after performing a first heat treatment of holding at a first heat treatment temperature of 800° C. or higher and 950° C. or lower, the R-T-B based sintered magnet material satisfying compositional requirements; and 2) a heat treatment step of performing a second heat treatment by heating the R-T-B based sintered magnet material to a second heat treatment temperature of 650° C. or higher and 750° C. or lower, and then cooling the R-T-B based sintered magnet material to 400° C. at 5° C./min or more.