High-corrosion-resistance sintered neodymium-iron-boron magnet and preparation method thereof

The invention relates to a preparation method of a high-corrosion-resistance sintered neodymium-iron-boron magnet. The preparation method comprises the steps of preparation of an alloy I and an alloy II, powder mixing, grinding and forming, high-temperature sintering, screen printing and coating of TbH3 slurry, two-step annealing and the like. Through a preparation process of a dual-alloy permanent magnet matrix and an innovative technical means of component design optimization, the requirement of an industrial motor on a high-performance magnet at the present stage is met; the grain boundary diffusion technology can reduce the use amount of heavy rare earth and effectively save heavy rare earth resources; and the production cost of the magnet is reduced, the comprehensive cost performance of the product is improved, and great significance is achieved for the permanent magnet industry. 本发明涉及一种高耐蚀性烧结钕铁硼磁体的制备方法，包括合金Ⅰ、合金Ⅱ的制备、混粉，磨粉成型，高温烧结，TbH3浆料的丝印涂覆以及两步退火等步骤。通过双合金法永磁基体的制备工艺及成分设计优化的创新技术手段，满足现阶段工业电机对高性能磁体的需求；晶界扩散技