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、合金粉末粒度对烧结致密化过程的影响,研究了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三个阶段,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,而且后者对磁体实现完全致密化起着决定性的作用。
The densification process and mechanism in sintered Nd-Fe-B magnets have been investigated in this paper. 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 alloy powder size accelerates the densification process markedly. The densification process progresses through Nd2Fe14B grain rearrangement, Nd2Fe14B grain growth and Nd2Fe14B grain shape accommodation. Moreover, Nd2Fe14B grain growth and Nd2Fe14B grain shape accommodation are considered to be the key factor leading to full densification of sintered Nd-Fe-B magnets.
出处
《磁性材料及器件》
CAS
CSCD
2006年第5期24-28,共5页
Journal of Magnetic Materials and Devices
