期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 710, 期 -, 页码 138-143出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.03.229
关键词
Soft magnetic composites; Iron oxide; Insulating matrix; Permeability; Core loss
资金
- Public Technology Application Research Projects of Zhejiang Province [2016C31008]
- National Natural Science Foundation of China (NSFC) [11404284]
- NPL-CAEP Project [2015DB04]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13R54]
Soft magnetic composites (SMCs) containing Fe powders embedded in insulating matrix have been fabricated via alkaline bluing as a new method. Effects of reaction time on the magnetic properties of the SMCs have been investigated. Mechanism of the oxidation process has also been revealed, which involves initial oxidation of Fe into Fe2+ (Na2FeO2) and Fe3+ (Na2Fe2O4) by NaNO2 and NaNO3 followed by hydrolysis of Fe-2+ and Fe3+ into Fe3O4. Hydrolysis of the excessive Fe3+ leads to the formation of Fe2O3 which reduced the effective permeability of the SMCs. To form pure Fe3O4 coating, the reaction process has been improved to suppress the Fe3+ hydrolysis. The obtained ferromagnetic Fe3O4 coating effectively reduces magnetic dilution, while its high electrical resistivity allows satisfactory insulation between the Fe powders, giving rise to simultaneous high effective permeability (97.7) and low core loss (771.3 mW/ cm(3)) of the SMC. (C) 2017 Elsevier B.V. All rights reserved.
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