Reduction of core loss in non-oriented (NO) electrical steel by electroless-plated magnetic coating

An important issue in development of electrical steels for core-laminated products is to reduce core loss to improve energy conversion efficiency. This is usually obtained by tailoring the composition, microstructure, and texture of electrical steels themselves. A new technique to reduce core loss i...

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Bibliographic Details
Published in:	Journal of magnetism and magnetic materials Vol. 323; no. 3; pp. 306 - 310
Main Authors:	Chivavibul, Pornthep, Enoki, Manabu, Konda, Shigeru, Inada, Yasushi, Tomizawa, Tamotsu, Toda, Akira
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-02-2011 Elsevier
Subjects:	Coating Condensed matter: electronic structure, electrical, magnetic, and optical properties Core loss Deposition Electrical steel Electrical steels Electroless coatings Electroless plating Exact sciences and technology Fe and its alloys Magnetic properties and materials Nickel Ni–Co–P Physics Reduction Scanning electron microscopy Studies of specific magnetic materials Texture Electrical steel Ni–Co–P Coating Core loss Electroless plating Nickel base alloys Scanning electron microscopy XRD Dispersive spectrometry Ni-Co-P Texture Alloy steel Thickness Metal coating Iron loss Electrodeposition Magnetic sheet Chemical composition Microstructure Transition element alloys
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Summary:	An important issue in development of electrical steels for core-laminated products is to reduce core loss to improve energy conversion efficiency. This is usually obtained by tailoring the composition, microstructure, and texture of electrical steels themselves. A new technique to reduce core loss in electrical steel has been investigated. This technique involves electroless plating of magnetic thin coating onto the surface of electrical steel. The material system was electroless Ni–Co–P coatings with different thicknesses (1, 5, and 10 μm) deposited onto the surface of commercially available Fe–3% Si electrical steel. Characterization of deposited Ni–Co–P coating was carried out using X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray (EDX) spectrometer. The deposited Ni–Co–P coatings were amorphous and composed of 56–59% Ni, 32–35% Co, and 8–10% P by mass. The effect of coatings on core loss of the electrical steel was determined using single sheet test. A core loss reduction of 4% maximum was achieved with the Ni–Co–P coating of 1 μm thickness at 400 Hz and 0.3 T. ► New approach to reduce core loss of electrical steel by magnetic coating. ► Ni-Co-P coating influences core loss of NO electrical steel. ► Core loss increases in RD direction but reduces in TD direction.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0304-8853
DOI:	10.1016/j.jmmm.2010.09.024