Process for producing metal coated glass-ceramic articles

Claim 2

The method of claim 1 wherein the glass-forming batch consists essentially of: a. a glass selected from the group consisting of: SiO2 40-88 percent, Al2O3 1.0-35 percent and Li2O 0.5-30 percent; SiO2 40-88 percent, Al2O3 1.0-35 percent, Li2O 0.5-30 percent and MgO 0.5-30 percent; SiO2 40-88 percent, Al2O3 1.0-35 percent, Li2O 0.5-30 percent, MgO 1.0-30 percent and Ca0 1-15 percent; and SiO2 40-88 percent, Al2O3 1.0-35 percent, MgO 1.0-30 percent and CaO 1-15 percent b. an added glass compound selected from the group consisting of: B2O3 0-10 percent; 0-22 percent of Na2O, K2O or mixtures; and PbO O-15 percent c. a nucleating agent selected from the group consisting of the following compounds and combinations of compounds: TiO2 0.5-20 percent; ZrO2 0.5-15 percent; F 0.2-15 percent; P2O5 0.5-20 percent; TiO2 0.5-20 percent and ZrO2 0.5-15 percent; TiO2 0.5-20 percent, ZrO2 0.5-15 percent and F 0.2-15 percent; ZrO2 0.5-15 percent and F 0.2-15 percent; TiO2 0.5 -20 percent and F 0.2-15 percent; P2O5 0.5-20 percent and F 0.2-15 percent; TiO2 0.5-20 percent and P2O5 0.5-20 percent; ZrO2 0.5-15 percent and P2O5 0.5-20 percent; TiO2 0.5-20 percent, P2O5 0.5-20 percent and F 0.2-15 percent; ZrO2 0.5-15 percent, P2O5 0.5-20 percent and F 0.2-15 percent; TiO2 0.5-20 percent, ZrO2 0.5-15 percent and P2O5 0.5-20 percent; TiO2 0.5-20 percent, ZrO2 0.5-15 percent, P2O5 0.5-20 percent and F 0.2-15 percent; and a combination of one of above nucleating agents with at least one member selected from CaF2, SnO2, BeO, Cr2O3, V2O5, NiO, AS2O3 and MoO3 in an amount of 1-10 percent; and d. at least one metal compound selected from oxides, chlorides, sulfates and nitrates of copper and silver in an amount of 0.05-5 percent, calculated as the metal.