METHOD FOR PRODUCING R-T-B SINTERED MAGNET
First Claim
1. A method for producing a sintered magnet, the method comprising the steps of:
- providing a sintered R-T-B based magnet body, of which the R mole fraction that is defined by the content of a rare-earth element falls within the range of 31 mass % to 37 mass %;
providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe;
loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and
performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700°
C. to 1000°
C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously in the processing chamber.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for producing a sintered R-T-B based magnet according to the present application includes the steps of: providing a sintered R-T-B based magnet body, of which the R mole fraction that is defined by the content of a rare-earth element falls within the range of 31 mass % to 37 mass %; providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe; loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700° C. to 1000° C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously in the processing chamber.
11 Citations
9 Claims
-
1. A method for producing a sintered magnet, the method comprising the steps of:
-
providing a sintered R-T-B based magnet body, of which the R mole fraction that is defined by the content of a rare-earth element falls within the range of 31 mass % to 37 mass %; providing an RH diffusion source including a heavy rare-earth element RH (which is at least one of Dy and Tb) and 30 mass % to 80 mass % of Fe; loading the sintered magnet body and the RH diffusion source into a processing chamber so that the magnet body and the diffusion source are movable relative to each other and readily brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered magnet body and the RH diffusion source at a process temperature of 700°
C. to 1000°
C. while moving the sintered magnet body and the RH diffusion source either continuously or discontinuously in the processing chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification