Patent ID: 9558885
Date: 2017-01-31
CPC Classifications: B22F,C22C,C23C,H01F

Claim:
1. A method for producing a surface-modified rare earth metal-based sintered magnet, consisting of: a step of heating a rare earth metal-based sintered magnet from ordinary temperature to a heat treatment temperature of 200° C. to 600° C. in an atmosphere having an oxygen partial pressure of 1×10 a step of subjecting the rare earth metal-based sintered magnet to a heat treatment at the heat treatment temperature at the same oxygen partial pressure and water vapor partial pressure as in the step of heating from ordinary temperature, and then a step of cooling the rare earth metal-based sintered magnet at the same oxygen partial pressure and water vapor partial pressure as in the step of heating from ordinary temperature and in the step of subjecting to the heat treatment.