Soft magnetic composites based on the Fe elemental, binary and ternary alloy systems fabricated by surface nitridation

•Fe, FeSi, FeSiAl and FeSiCr SMCs fabricated via surface nitridation.•Morphology and composition of the coatings correlated to the performance of SMCs.•Growth models of the coatings established via thermodynamic and kinetics analysis.•Enhanced magnetic performance of the FeSiCr SMCs containing α-Fe(...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-07, Vol.481, p.140-149
Main Authors: Zhao, Jing, Wu, Chen, Luo, Dahao, Yan, Mi
Format: Article
Language:English
Subjects:
Alloy systems
Binary alloys
Chromium nitride
Coatings
Composite materials
Core loss
Effective permeability
Electrical resistivity
Insulation
Iron nitride
Iron silicide
Magnetic performance
Nitride coating
Phosphoric acid
Ternary alloys
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Summary:•Fe, FeSi, FeSiAl and FeSiCr SMCs fabricated via surface nitridation.•Morphology and composition of the coatings correlated to the performance of SMCs.•Growth models of the coatings established via thermodynamic and kinetics analysis.•Enhanced magnetic performance of the FeSiCr SMCs containing α-Fe(N) and CrN coating. Surface nitridation has been used to fabricate the insulation coatings of the Fe, FeSi, FeSiAl and FeSiCr soft magnetic composites (SMCs). Effects of the nitridation conditions on the magnetic performance of the SMCs have been investigated. Detailed growth mechanism and models of the coating layers for different alloy systems have been established based on combined thermodynamic and kinetics analysis. For Fe and FeSi SMCs, nitride coatings containing α-Fe(N) forms, while coexistenc of α-Fe(N) and Fe4N is obtained for the FeSiAl SMCs. For the FeSiCr system, the nitride coating is composed of α-Fe(N) and CrN with relatively large electrical resistivity, giving rise to enhanced magnetic performance compared with that of the SMCs prepared via traditional phosphoric acid passivation.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.01.070