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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 |
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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.
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Received: 19 March 2015
Revised: 21 May 2015
Accepted manuscript online:
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PACS:
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75.50.-y
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(Studies of specific magnetic materials)
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81.05.-t
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(Specific materials: fabrication, treatment, testing, and analysis)
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71.20.Eh
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(Rare earth metals and alloys)
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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
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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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