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Nanomaterials 2017, 7(1), 1; doi:10.3390/nano7010001

Improving Powder Magnetic Core Properties via Application of Thin, Insulating Silica-Nanosheet Layers on Iron Powder Particles

Toyota Central R&D Labs., Inc., 41-1 Nagakute, Aichi 480-1192, Japan
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Academic Editor: Thomas Nann
Received: 19 October 2016 / Revised: 14 December 2016 / Accepted: 15 December 2016 / Published: 23 December 2016
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Abstract

A thin, insulating layer with high electrical resistivity is vital to achieving high performance of powder magnetic cores. Using layer-by-layer deposition of silica nanosheets or colloidal silica over insulating layers composed of strontium phosphate and boron oxide, we succeeded in fabricating insulating layers with high electrical resistivity on iron powder particles, which were subsequently used to prepare toroidal cores. The compact density of these cores decreased after coating with colloidal silica due to the substantial increase in the volume, causing the magnetic flux density to deteriorate. Coating with silica nanosheets, on the other hand, resulted in a higher electrical resistivity and a good balance between high magnetic flux density and low iron loss due to the thinner silica layers. Transmission electron microscopy images showed that the thickness of the colloidal silica coating was about 700 nm, while that of the silica nanosheet coating was 30 nm. There was one drawback to using silica nanosheets, namely a deterioration in the core mechanical strength. Nevertheless, the silica nanosheet coating resulted in nanoscale-thick silica layers that are favorable for enhancing the electrical resistivity. View Full-Text
Keywords: powder magnetic core; silica nanosheet; insulating layer; electrical resistivity; iron loss; magnetic flux density powder magnetic core; silica nanosheet; insulating layer; electrical resistivity; iron loss; magnetic flux density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ishizaki, T.; Nakano, H.; Tajima, S.; Takahashi, N. Improving Powder Magnetic Core Properties via Application of Thin, Insulating Silica-Nanosheet Layers on Iron Powder Particles. Nanomaterials 2017, 7, 1.

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