Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd Fe B magnets

• 作者: 严高林 刘硕 周贝贝 曹学静 李向斌 闫阿儒 陈岭
• 来源期刊: 中国物理B（英文版）
• 关键词: terbium sulfide magnetic property microstructure thermal stability
• 年，卷（期）: 2016,（7）
• 页码范围: 077502-1-077502-4
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/077502

摘要

To increase coercivity and thermal stability of sintered Nd–Fe–B magnets for high-temperature applications, a novel terbium sulfide powder is added into (Pr0.25Nd0.75)30.6Cu0.15FebalB1 (wt.%) basic magnets. The effects of the addition of terbium sulfide on magnetic properties, microstructure, and thermal stability of sintered Nd–Fe–B magnets are investigated. The experimental results show that by adding 3 wt.% Tb2S3, the coercivity of the magnet is remarkably increased by about 54%without a considerable reduction in remanence and maximum energy product. By means of the electron probe microanalyzer (EPMA) technology, it is observed that Tb is mainly present in the outer region of 2:14:1 matrix grains and forms a well-developed Tb-shell phase, resulting in enhancement of HA, which accounts for the coercivity enhancement. Moreover, compared with Tb2S3-free magnets, the reversible temperature coefficients of remanence (α) and coercivity (β) and the irreversible flux loss of magnetic flow (hirr) values of Tb2S3-added magnets are improved, indicating that the thermal stability of the magnets is also effectively improved.