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

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

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.

Keywords: rare earth dysprosium magnetic properties oxidation

Received: 19 March 2015
Revised: 21 May 2015
Accepted manuscript online:

PACS:	75.50.-y	(Studies of specific magnetic materials)
	81.05.-t	(Specific materials: fabrication, treatment, testing, and analysis)
	71.20.Eh	(Rare earth metals and alloys)

Fund: 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).

Corresponding Authors: Yan Gao-Lin
E-mail: gaolinyan@whu.edu.cn

Cite this article:

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

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

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