Preparation of ferrite films for electrical insulation by ultrasound-enhanced ferrite plating

Author

Nakayama, Y. ; Yajima, H. ; Kitamoto, Y. ; Abe, M.

Author_Institution

Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3040

Lastpage

3042

Abstract

The ferrite plating with applying power ultrasound waves of 19.5 kHz and 600 W enabled us to encapsulate entirely MnZn ferrite cores for transformers with Ni_xZn_yFe_3-x-yO₄ coating. Supplying a NH₄OH solution during the plating broke the limit of the solubility of Ni ions to ferrite-plated films. The electrical resistance of the NiZn ferrite increased with increasing the Ni and Zn content, reaching 2.3×10⁵ Ω cm at the composition of Ni_0.24Zn_0.30Fe_2.46O ₄. The saturation magnetization was 540 emu/cm³. The MnZn ferrite cores were successfully encapsulated with NiZn ferrite coating, resulting in the increase of their surface resistance to over 100 kΩ

Keywords

ferrites; insulating coatings; liquid phase deposition; magnetic thin films; magnetisation; manganese compounds; nickel compounds; solubility; stoichiometry; surface conductivity; transformer cores; ultrasonic applications; zinc compounds; 100 kohm; 19.5 kHz; 2.3E5 ohmcm; 600 W; MnZn ferrite cores; MnZnFe₂O₄; NH₄OH; NH₄OH solution; Ni_0.24Zn_0.30Fe_2.46O₄; Ni_xZn_yFe_3-x-yO₄ coating; NiZn ferrite coating; electrical insulation; electrical resistance; ferrite films; ferrite-plated film; power ultrasound waves; preparation; saturation magnetization; solubility; surface resistance; transformers; ultrasound-enhanced ferrite plating; Coatings; Dielectrics and electrical insulation; Electric resistance; Ferrite films; Iron; Power transformer insulation; Surface resistance; Transformer cores; Ultrasonic imaging; Zinc;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.801078

Filename

801078