Abstract
Silica-coatings prepared by sol-gel method was coated on CP-titania cones and discs. Thin coatings of less than approximately 0.3 μm were produced, The greatest advantage with the Si-gel coatings is that the densification of the gel takes place at already 500°C, thus not changing the character of the metal surface. The coatings showed to passivate the surface of the CP-titania specimen, provided that the thickness did not exceed 0.3 μm. That seemed to be the critical thickness for a smooth and intact coating. Thicker coatings of Si-gel scales easily off.
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