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Spray pyrolysis is a well-known technique for depositing metal oxides over large area substrates. Cobalt oxide based thin films have been deposited on glass substrates on the float glass production line by spray pyrolysis technique. The commercial products of this type of coatings are used for architectural purposes and in automotive industries. Additions of transition metal oxides in Co-oxide such as Cr and Fe improved mechanical and chemical properties of Co-based oxide coating. The Co-based binary and ternary mixed oxides showed cubic spinel structure. Lattice constants increased as the content of the additives increased and mean crystallite sizes decreased. The absorption bands in optical transmission spectra of the Cooxide tended to disappear and the transmittance increased with increasing Cr content. The results of durability tests showed that the Cr improved the chemical resistance and Fe incresed the adhesion and abrasion resistances.

Nano-composite sol-gel coatings on commercial glasses were applied by dip coating. Coating solution contained TEOS and GLYMO together with solvent, water and acid as a catalyst. Withdrawing rates of 2, 6 and 12 inch/min were applied and heat-treatment conditions were 200 o C for 1 hour in static air. Abrasion resistance, chemical resistance test with HCl, adhesion tests such as cross hutch cutter and HF were carried out and optical properties were measured in order to study the effects of these hard nano-composite coatings on glass. Results showed that the abrasion resistances were very high on Taber abrasion tests comparable to that of glass. Also optical properties of coated glasses were very similar to those of uncoated glasses. Only there was a small increase on transmission and this is a desirable optical property in glass applications.