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J. Korean Ceram. Soc. > Volume 51(3); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(3): 177.
doi: https://doi.org/10.4191/kcers.2014.51.3.177
EPD 방법을 이용한 알루미나-실리카 복합 코팅막의 제조와 전기절연 특성
지혜, 김두환, 박희정, 임형미, 이승호, 김대성, 김영희
한국세라믹기술원 에너지환경소재본부
Preparation of Alumina-Silica Composite Coatings by Electrophoretic Deposition and their Electric Insulation Properties
Hye Ji, Doo Hwan Kim, Hee Jeong Park, Hyung Mi Lim, Seung-Ho Lee, Dae Sung Kim, Younghee Kim
Energy & Environmental Division, Korea Institute of Ceramic Engineering & Technology
Alumina-silica composite coating layers were prepared by electrophoretic deposition (EPD) of plate-shaped alumina particles dispersed in a sol-gel binder, which was prepared by hydrolysis and the condensation reaction of methyltrimethoxysilane in the presence of colloidal silica. The microstructure and the electrical and thermal properties of the coatings were compared according to the EPD process parameter: voltage, time and the content of the plate-shaped alumina particles. The electrical insulation property of the coatings was measured by a voltage test. The coatings were prepared by EPD of the sol-gel binder with 5-30 wt% plate alumina particles on parallel electrodes at a distance of 2 cm for 1-10 min under an applied voltage of 10-30 V. The coatings experienced increased breakdown voltage with increasing thickness. However, the higher the thickness was, the smaller the breakdown voltage strength was. A breakdown voltage as high as 4.6 kV was observed with a $400{mu}m$ thickness, and a breakdown voltage strength as high as 27 kV/mm was achieved for the sample under a $100{mu}m$ thickness.
Key words: Sol-gel, Plate-shaped alumina, Electrophoretic deposition, Electrical insulation coating, Breakdown voltage
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