Effects of oxidation of DyH3 in Nd-Fe-B sintered magnets
The effects of oxidation of Dy H3 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°C for...
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| Published in | 中国物理B：英文版 no. 10; pp. 467 - 470 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.10.2015
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| Subjects | |
| Online Access | Get full text |
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| Summary: | The effects of oxidation of Dy H3 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°C 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 preoxidised 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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| Bibliography: | The effects of oxidation of Dy H3 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°C 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 preoxidised 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. rare earth, dysprosium, magnetic properties, oxidation Yan Gao-Lin, Fang Zhi-Hao（School of Physics and Technology, Wuhan University, Wuhan 430072, China） 11-5639/O4 |
| ISSN: | 1674-1056 2058-3834 |
| DOI: | 10.1088/1674-1056/24/10/107503 |