Abstract
Semi-conductive ceramic films can be produced economically and easily by thermal spraying method. The solar energy selective absorption characteristics and photoelectrolytic characteristics of ceramic films were observed. The ceramic films were composed of TiO2, Cr2O3, and mixture of TiO2 and Al2O3 powders. 1) Solar energy selective absorption characteristics; sprayed TiO2 film showed below 0.1% reflectance over wave lengths of visible ray, but strong reflectance was observed above 7μm of infrared ray. Mixtured films of TiO2 and Al2O3 were showed the most superior temperature ascent. 2) Photoelectrolytic characteristics; sprayed TiO2 films on Ti substrate were obtained by argon-plasma, air-plasma and flame sprayings of TiO2 powders. These films were heat treated in air at 800°C for 1-10 hours. The photocurrent of air plasma sprayed film electrode was greatest compared with other two specimens.
