Soft magnetic composites based on the Fe elemental, binary and ternary alloy systems fabricated by surface nitridation
Abstract
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.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- July 2019
- DOI:
- 10.1016/j.jmmm.2019.01.070
- Bibcode:
- 2019JMMM..481..140Z
- Keywords:
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- Nitride coating;
- Magnetic performance;
- Electrical resistivity;
- Effective permeability;
- Core loss