Abstract: The present invention provides a new and improved lead-free and cadmium-free glass enamel composition that displays good flow at traditional glass enamel firing temperatures and upon firing produces an enamel finish that displays no cracking, good chemical resistance, good weatherability, and improved color values. The glass enamel composition of the present invention includes a glass component, an oxidizer, a pigment system, and optional vehicles and fillers. The presence of the oxidizer in the composition, which can be included as part of the glass component, as a separately added material, or both, improves the color values of the fired enamel as compared to enamels formed using similar glass enamel compositions having no oxidizer present.

Abstract: The present invention provides high temperature sealing glass compositions for use in producing mechanically and chemically durable electrically insulating hermetic glass seals between materials such as zirconia, alumina, fosterite, steatite, carbon steels, stainless steels, and superalloys. High temperature sealing glass compositions according to the present invention include a glass component and optional vehicles. The glass component includes one or more glass frits containing in weight percent from about 17% to about 56% BaO+SrO, from about 18% to about 60% SiO.sub.2, from about 6% to about 36% B.sub.2 O.sub.3, from about 2% to about 32% Al.sub.2 O.sub.3, from about 0% to about 25% CaO plus MgO, from about 0% to about 20% Y.sub.2 O.sub.3, from about 0% to about 7% ZrO.sub.2, from about 0% to about 3% alkali oxides, from about 0% to about 5% Co.sub.3 O.sub.4, from about 0% to about 5% NiO, and from about 0% to about 3% MoO.sub.3.

Abstract: The present invention provides lead and cadmium free glass enamel compositions. In one embodiment of the invention, glass frits include from about 0.1 percent by weight to about 15 percent by weight Nb.sub.2 O.sub.5, less than about 3 percent by weight alkali metal oxides, less than about 3 percent by weight ZnO, less than about 1 percent by weight B.sub.2 O.sub.3, and precursors from which Bi.sub.2 SiO.sub.5 can be crystallized upon firing, said precursors including Bi.sub.2 O.sub.3 and SiO.sub.2. Glass frits according to the present invention preferably further include up to about 25 percent by weight of coloring oxides, such as CeO.sub.2, Co.sub.3 O.sub.4, In.sub.2 O.sub.3, SnO, Cr.sub.2 O.sub.3, CuO, Fe.sub.2 O.sub.3, MnO.sub.2, MoO.sub.3, NiO, and V.sub.2 O.sub.5. By incorporating various amounts of coloring oxides into the compositions, the degree of crystallization and the rate at which crystallization occurs upon firing of the compositions can be controlled.

Abstract: The present invention provides a new and improved coating composition for use in forming a dielectric layer upon a section of metal upon firing. The coating composition includes a glass composition, said glass composition comprising in weight percent a combined weight of BaO and SrO of from about 15% to about 75%, from about 5% to about 35% B.sub.2 O.sub.3, from about 10% to about 40% SiO.sub.2, up to about 10% Al.sub.2 O.sub.3, up to about 7% Co.sub.3 O.sub.4, up to about 20% ZnO, up to about 20% TiO.sub.2, up to about 7% P.sub.2 O.sub.5, up to about 7% CuO, up to about 7% Fe.sub.2 O.sub.3, up to about 7% NiO, a combined weight of SnO, MoO.sub.3, WO.sub.3, Sb.sub.2 O.sub.5, of up to about 20%, up to about 20% Bi.sub.2 O.sub.3, a combined weight of up to about 20% Nb.sub.2 O.sub.5, La.sub.2 O.sub.3, Y.sub.2 O.sub.3 and CeO.sub.2, up to about 5% ZrO.sub.2, up to about 20% CaO, up to about 5% MgO, up to about 2% As.sub.2 O.sub.3 and a combined weight of up to about 3% Li.sub.2 O, Na.sub.2 O and K.sub.2 O.

Abstract: The present invention provides a new and improved thick film paste for use as an acid resistant overglaze. In one preferred embodiment such paste includes a glass composition comprising in weight percent from about 30% to about 60% PbO, from about 5% to about 20% ZnO, from about 2% to about 20% B.sub.2 O.sub.3, from about 4% to about 12% Al.sub.2 O.sub.3, from about 5% to about 18% SiO.sub.2, up to about 8% ZrO.sub.2, up to about 8% TiO.sub.2 and from about 9% to about 21% Nb.sub.2 O.sub.5.