Improved corrosion resistance and thermal stability of sintered Nd-Fe-B magnets with holmium substitution

作     者：Jinghui Di Shuai Guo Ling Chen Pengpeng Yi Guangfei Ding Kan Chen Ming Li Don Lee Aru Yan 

作者机构：Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and Engineering Chinese Academy of SciencesNingbo 315201China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Material Technology and Engineering Chinese Academy of SciencesNingbo 315201China University of Chinese Academy of SciencesBeijing 100049China Ningbo Songke Magnetic Material Co. Ltd.Ningbo 315517China University of Dayton.OH 45469USA 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2018年第36卷第8期

页      面：826-831页

核心收录：

学科分类：080801[工学-电机与电器] 0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：Project supported by the Ningbo Major Technology Innovation Projects(2017B10005) Ningbo Natural Science Foundation(2015A610011) Guangxi Science and Technology Project(2016AD05041) 

主　　题：Corrosion resistance Ho substitution Nd-Fe-B Thermal stability Rare earths 

摘      要：The effects of Ho substitution for Nd on the microstructure, corrosion resistance and thermal stability of the Nd-Fe-B magnets were investigated. The（Nd,Ho）-O phase was formed with increasing Ho substitution. The results of potentiodynamic polarization and highly accelerated stress test show improved corrosion resistance with increasing Ho substitution. The optimum mass loss 0.29 mg/cm^2 is ***, the average temperature coefficients for remanence and coercivity in the range of 25-150℃are both closer to zero, indicating improved thermal stability. The mechanisms for the improved corrosion resistance and thermal stability are discussed in relation to the microstructure featuring the（Nd,Ho）-O phase.