阅读说明：本技术 一种低熔点金属或合金辅助重稀土元素晶界扩散的方法 (Method for assisting grain boundary diffusion of heavy rare earth element by low-melting-point metal or alloy ) 是由 李家节 李飞飞 屈鹏鹏 何磊 仲洁 王磊 杨斌 于 2020-12-21 设计创作，主要内容包括：一种低熔点金属或合金辅助重稀土元素晶界扩散的方法,其特征在于：通过固相、液相、气相包覆的方法使重稀土金属粉末表面包覆一层低熔点金属/合金粉末,或者使低熔点金属/合金粉末表面包覆一层重稀土粉末,形成具有表面改性的异质核壳结构的复合粉作为扩散源。通过晶界扩散技术制备高性能钕铁硼永磁材料,能够在减少重稀土用量的同时,大幅度提高稀土永磁体的内禀矫顽力。(A method for assisting grain boundary diffusion of heavy rare earth elements by low-melting-point metal or alloy is characterized by comprising the following steps: the surface of the heavy rare earth metal powder is coated with a layer of low-melting-point metal/alloy powder by a solid-phase, liquid-phase and gas-phase coating method, or the surface of the low-melting-point metal/alloy powder is coated with a layer of heavy rare earth powder to form composite powder with a surface-modified heterogeneous core-shell structure as a diffusion source. The high-performance neodymium iron boron permanent magnet material is prepared by a grain boundary diffusion technology, so that the intrinsic coercive force of the rare earth permanent magnet can be greatly improved while the use amount of heavy rare earth is reduced.)