| 简介 |
PROBLEM TO BE SOLVED : To provide a method of producing a rare earth magnet in which Dy, or the like, can be diffused to the inside efficiently in a short time.
SOLUTION : The method of producing a rare earth magnet comprises : an arrangement step of arranging a magnet material, i.e. a molding or a sintered compact of powder particles composed of a rare earth magnet alloy, and a diffusion material containing a diffusion element for enhancing the coercive-force in close proximity; and a diffusion step of diffusing the diffusion elements into the magnet material by exposing a heated magnet material to vapor of the diffusion material evaporated from a heated diffusion material. The diffusion step is a step of heating the diffusion material to a diffusion material temperature (Td) different from a magnet material temperature (Tm), i.e. the heating temperature of the magnet material, independently therefrom. Since diffusion processing is performed while setting the magnet material temperature (Tm) and the diffusion material temperature (Td) separately, the diffusion elements can be diffused to the inside of the magnet efficiently even by heating of very short time.
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