Abstract: The present invention provides an article of cookware bearing a thermally cured sol-gel coating that is transparent, adherent, and exhibits excellent durability and chemical resistance. Preferably, the sol-gel coating composition, which includes a colloidal suspension of hydrolyzed metal alkoxide particles in an organic solvent, is applied to bare metal such as aluminum and its alloys or to porcelain enameled metals or other substrates using a conventional wet application technique such as spraying. The sol-gel coating composition is then thermally cured at a temperature below about 500° C. to provide a durable transparent inorganic polymer coating that exhibits excellent physical and chemical resistance. The present invention also provides a method of making such an article of cookware.

Abstract: The present invention provides a composition for use in forming an adherent, brilliant white, chemically and mechanically resistant porcelain enamel coating on aluminized steel. The composition includes a self-opacifying glass frit component which includes high levels of titanium dioxide, lithium oxide, sodium oxide, and potassium oxide. The composition is able to produce a brilliant white finish on aluminized steel in one coat without the addition of titanium oxide during milling.

Abstract: The present invention provides a new and improved porcelain enamel coating composition for use in forming a self-cleanable coating upon aluminized steel. The coating composition comprises a glass component having a composition comprising from about 30% to about 55% SiO2, from about 11% to about 20% TiO2, from about 0% to about 10% B2O3, from about 20% to about 40% alkali metal oxides, less than about 5% rare earth metal oxides, from about 0% to about 10% CaO, from about 0% to about 10% BaO, from about 0% to about 10% MnO, from about 2% to about 12% CuO, from about 0% to about 10% Sb2O3, from about 1.5% to about 10% Fe2O3, from about 0% to about 10% SnO2, from about 0% to about 10% P2O5, less than about 2% MoO3, and less than about 5% V2O5.