高性能烧结NdFeB生产关键技术研究

Study on Key Techniques for Producing High Performance NdFeB Sintered Permanent Magnets

采用薄形结晶器铸锭技术、气流磨窄粒度控制技术、低氧含量控制技术、高取向磁场成型技术等成功地批量生产了磁能积为 36 5kJ·m- 3 和磁能积为 310kJ·m- 3 、矫顽力为 16 40kA·m- 1 的NdFeB磁体。研究表明 :获得尺寸细小的片状晶铸锭、平均粒度小于 4.0

High energy products (BH) max of 365 kJ·m -3 and (BH) max of 310 kJ·m -3 with an intrinsic coercivity i H c of 1640 kA·m -1 of NdFeB sintered magnets were produced. Some new techniques have applied, such as thin NdFeB ingot technique, narrow particle distribution on jet mill, low oxygen content control and high magnetic field press. Thin NdFeB ingot with fine flake crystalline, narrow particle distribution, the average size of NdFeB powders less than 4 0 μm, uniform microstructure, small and high oriented Nd 2Fe 14 B grains are necessary to obtain high performance NdFeB sintered magnets.