期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 628, 期 -, 页码 282-286出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.12.177
关键词
NdFeB sintered magnet; Magnetic properties; DyHx; Hydrogen; Nd-rich phases
资金
- National Natural Science Foundation of China [51171168, 51171169, 51471149]
- Public Project of Zhejiang Province [2013C31033]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Program for Key Innovative Team for Magnetic Materials of Zhejiang Province
In order to improve the coercivity of Nd-Fe-B sintered magnets, DyH2 and DyH3 fine powders were prepared and used as additive for preparing Nd-Fe-B sintered magnets. The effects of DyHx powders addition on the microstructures and the magnetic properties of the magnets have been investigated. It was found that hydrogen will react with oxygen of NdOx rich intergranular phases to form Nd rich phases by dysprosium hydride addition. The Nd-rich grain boundary phases are more homogenous and continuous because the volume fraction of Nd-rich grain boundary phases increases with respect to the Nd oxide phases. After desorption, fine dysprosium powders become more active and wrap matrix phases well so that the diffusion of dysprosium to the surface layer of matrix phases is convenient, so dysprosium decreases in grain boundary phases and aggregates in surface layer of matrix phases. Then, intrinsic coercivity of NdFeB sintered magnets is improved from 14.96 kOe to 20.5 kOe and 20.31 kOe by 2.0 wt.% DyH3 and 2.0 wt.% DyH2 addition, respectively. This study has shown that DyHx addition can reduce the content of oxygen in grain boundary phases. This can be an effective method for massive production. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据