High-consistency neodymium-iron-boron magnet and preparation method thereof

Abstract

The invention discloses a high-consistency neodymium-iron-boron magnet and a preparation method thereof, and the method comprises the following steps: carrying out sand blasting treatment on the orientation surface of the magnet to form a pit, and carrying out double-sided grinding to reduce the surface roughness Ra of the pit to 0.05-0.6 [mu] m; after cleaning and drying, carrying out heat preservation for 6-30h with a heavy rare earth diffusion source and mixing assisting balls in a rotary furnace at 600-750 DEG C according to a proportion, and carrying out low-temperature rotary film coating; and then high-temperature diffusion is conducted for 4-10 h at the temperature of 800-950 DEG C, and aging is conducted for 3-5 h at the temperature of 450-600 DEG C. According to the method, the contradiction between the diffusion uniformity and the weight increment of the high-weight rare earth is alleviated by combining the surface topography control and the rotary dynamic film coating technology on the premise of not changing the rotary dynamic film coating technological parameters, the magnet with the gradient structure is finally obtained, and the magnetic performance and the consistency of the magnet are improved.

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