摘要
定量描述了Nd-Fe-B磁体的烧结致密化过程,分析了有效稀土含量、合金粉末粒度与烧结致密化过程的关系,讨论了Nd-Fe-B磁体烧结过程的致密化机制。Nd-Fe-B磁体烧结致密化过程可分为3个阶段,即致密化过程迅速进行阶段、缓慢进行阶段、相对稳定阶段;随着烧结温度的上升,第一阶段表现得更为突出,第二阶段对应的烧结时间区段大大缩短。有效稀土含量的提高、合金粉末粒度的减小显著促进Nd-Fe-B磁体烧结致密化过程。主相颗粒重排以及主相颗粒长大与形状适位性变化是Nd-Fe-B磁体烧结过程的两类主要致密化机制,而且后者对于Nd-Fe-B烧结磁体实现完全致密化起着决定性的作用。
The densification process and densification mechanism during sintering of Nd-Fe-B magnets were investigated. The densification process includes rapid densification stage, slow densification stage and saturation densification stage. A higher effective total rare earth content or a smaller average size of ahoy powder accelerates the densification process markedly. The densification process progresses through NdzFe14B grain rearrangement, NdzFe14B grain growth and NdzFe14B grain shape accommodation. Moreover, NdzFe14B grain growth and NdzFe14B grain shape accommodation are considered to be the key factors leading to full densifieation of sintered Nd-Fe-B magnet.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第5期604-609,共6页
Chinese Journal of Rare Metals
基金
国家重点基础研究发展计划(973)(G2000-67201-3)资助项目
