Effects of oxidation of DyH3 in Nd-Fe-B sintered magnets

doi:10.1088/1674-1056/24/10/107503

中国物理B ›› 2015, Vol. 24 ›› Issue (10): 107503-107503.doi: 10.1088/1674-1056/24/10/107503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets

严高林, 方之颢

School of Physics and Technology, Wuhan University, Wuhan 430072, China

收稿日期:2015-03-19 修回日期:2015-05-21 出版日期:2015-10-05 发布日期:2015-10-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51172168 and 51072139) and the Science Funds from the Ministry of Science and Technology, China (Grant Nos. 2014DFB50130 and 2011CB612304).

Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets

Yan Gao-Lin (严高林), Fang Zhi-Hao (方之颢)

School of Physics and Technology, Wuhan University, Wuhan 430072, China

Received:2015-03-19 Revised:2015-05-21 Online:2015-10-05 Published:2015-10-05
Contact: Yan Gao-Lin E-mail:gaolinyan@whu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51172168 and 51072139) and the Science Funds from the Ministry of Science and Technology, China (Grant Nos. 2014DFB50130 and 2011CB612304).

摘要/Abstract

摘要： The effects of oxidation of DyH₃ with respect to dysprosium addition to Nd-Fe-B sintered magnets are examined. Samples sintered with the addition of freshly milled dysprosium hydride, dysprosium hydride exposed to air at room temperature for 15 min and dysprosium hydride exposed to air at 100 ℃ for 3.5 hours are studied from the aspects of magnetic properties, microstructures, and their degradation, respectively. It is found that some oxidized dysprosium is distributed in the Nd-rich phase; hence, the decrease of remanence occurred. The degradation results indicate that pre-oxidised dysprosium can be a major factor in increasing the corrosion rate. The microstructures and corrosion acceleration test suggested that the oxidation is detrimental to remanence.

关键词: rare earth, dysprosium, magnetic properties, oxidation

Abstract: The effects of oxidation of DyH₃ with respect to dysprosium addition to Nd-Fe-B sintered magnets are examined. Samples sintered with the addition of freshly milled dysprosium hydride, dysprosium hydride exposed to air at room temperature for 15 min and dysprosium hydride exposed to air at 100 ℃ for 3.5 hours are studied from the aspects of magnetic properties, microstructures, and their degradation, respectively. It is found that some oxidized dysprosium is distributed in the Nd-rich phase; hence, the decrease of remanence occurred. The degradation results indicate that pre-oxidised dysprosium can be a major factor in increasing the corrosion rate. The microstructures and corrosion acceleration test suggested that the oxidation is detrimental to remanence.

Key words: rare earth, dysprosium, magnetic properties, oxidation

中图分类号: (Studies of specific magnetic materials)

75.50.-y

81.05.-t (Specific materials: fabrication, treatment, testing, and analysis) 71.20.Eh (Rare earth metals and alloys)

严高林, 方之颢. Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets[J]. 中国物理B, 2015, 24(10): 107503-107503.

Yan Gao-Lin (严高林), Fang Zhi-Hao (方之颢). Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets[J]. Chin. Phys. B, 2015, 24(10): 107503-107503.

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Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets

Effects of oxidation of DyH₃ in Nd-Fe-B sintered magnets

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