Title :
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
fDate :
9/1/1999 12:00:00 AM
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 NixZnyFe3-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 Ni0.24Zn0.30Fe2.46O 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; Ni0.24Zn0.30Fe2.46O4; NixZnyFe3-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;
Journal_Title :
Magnetics, IEEE Transactions on
