关键词: Tb 金属薄膜, 晶界扩散, 烧结钕铁硼, 耐温性, 真空多弧离子镀

Abstract: In this paper, Tb thin film was deposited on the surface of sintered NdFeB magnets by the method of vacuum multiarc ion plating, and then a vacuum heat treatment was applied in the samples. Tb was introduced from the surface into the interior of the magnets by grain boundary diffusion (GBD), and the magnetic performance and heat resistance of the magnets was studied at last. The results show that after grain boundary diffusion treatment, the metal Tb enters the grain boundary within a certain depth range from the surface of the NdFeB magnet, resulting in the increasing of intrinsic coercivity of the magnets by 9000-10000Oe, and great reduction of high temperature hirr of the magnets. The intrinsic coercivity and heat resistance of the magnets were significantly improved.

Key words: Tb thin film, grain boundary diffusion, sintered NdFeB, heat resistance, vacuum multi-arc ion plating