Recent developments in the sintering of NdFeB
Recent developments in the sintering of NdFeB
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DOI：
10.1016/s0254-0584(00)00450-8
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发表时间：
2001-01-15
影响因子：
4.6
通讯作者：
Harris, IR
中科院分区：
文献类型：
--
作者：
Davies, BE;Mottram, RS;Harris, IR
烧结在全致密稀土永磁体的生产中起着重要作用。这些磁体的烧结由富含稀土元素的晶界相辅助，晶界相在低于烧结温度时为液体，并润湿硬磁（Nd2Fe14B）基体晶粒的表面。除了有助于致密化，该相在平滑和隔离晶粒以产生有利于良好磁性能的微观结构方面起着重要作用。本文简要回顾了钕铁硼类磁体烧结的研究进展，并介绍了这些实验室的最新研究成果。在这些研究中，已使用硬度计来研究NdFeB粉末压坯在一定温度和时间范围内的致密化。还使用粉末共混技术研究了组合物对致密化速率的影响，以在烧结之前改变组合物。在烧结过程中，采用稀土添加剂来改变液相的比例和组成。(C)2001爱思唯尔科技有限公司。保留所有权利。
Sintering plays a major role in the production of fully dense rare-earth permanent magnets. The sintering of these magnets is assisted by a ran-earth rich, grain boundary phase, which is liquid well below the sintering temperature and wets the surface of the hard magnetic (Nd2Fe14B) matrix grains. As well as aiding densification, this phase plays an important role in smoothing and isolating grains to produce a microstructure conducive to good magnetic properties. In this paper, previous studies of sintering in NdFeB-type magnets are reviewed briefly and recent investigations in these laboratories are described. In these studies, dilatometry has been used to study densification in NdFeB powder compacts over a range of temperatures and times. The effect of composition on the rate of densification was also investigated using a powder blending technique to vary the composition prior to sintering. Rare-earth hydrides were employed to vary the proportion and composition of the Liquid phase during sintering. (C) 2001 Elsevier Science B.V. All rights reserved.