摘要
采用放电等离子烧结技术和传统烧结技术制备了烧结NdFeB永磁体,并研究了2种磁体的磁性能、力学性能和化学稳定性.与传统烧结磁体相比,放电等离子烧结磁体具有与其相当的磁性能及更好的耐腐蚀和力学性能.显微组织结果表明,放电等离子烧结磁体主相Nd_2Fe_(14)B的晶粒细小、均匀.边界富钕相仅有少量位于主相Nd_2Fe_(14)B颗粒周围,大部分以颗粒形式分布在主相三角晶界处.这种独特的显微组织特征对于晶间腐蚀过程及脆性沿晶断裂过程具有明显的抑制作用.因此,放电等离子烧结磁体表现出优异的综合性能.
In present study, sintered Nd-Fe-B permanent magnets with different compositions were fabricated by using both Spark Plasma Sintering （SPS） technique and conventional sintering technique. Magnetic properties, mechanical properties, and chemical stabilities of the two kinds of Nd-Fe-B magnets are investigated. Compared with the conventional sintered magnets, SPS Nd-Fe-B magnets possess comparable magnetic properties, better corrosion resistance and mechanical properties. Microstructure observation shows that SPS magnet possesses unique microstructure due to the special sintering mechanism of SPS technique. In detail, the grain size of Nd2Fe14B main phase is fine and uniform, only a few Nd-rich phase forms along the grain bound-aries of Nd2Fe14B, while most of them agglomerates into the triple junctions. Such mizrostructure modification restrains effectively the inter-granular corrosion and inter-granular fracture along Nd-rich phase in the SPS magnet. As a result, SPS magnets display better corrosion resistance and mechanical properties.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2008年第3期314-317,共4页
Journal of Beijing University of Technology
基金
国家自然科学基金(50371002)
北京市教委科技发展计划资助项目(Km200310005019)
北京市科技新星计划资助项目(2003B03)
北京工业大学博士科研启动基金(52009999200706).
关键词
放电等离子烧结
NDFEB永磁
富Nd相
力学性能
耐蚀性
spark plasma sintering
Nd-Fe-B permanent magnets
Nd-rich phase
mechanical properties
corrosion resistance
