Cobalt glass compositions for coatings

摘要: A glass composition which is essentially free from lead and cadium comprises SiO2: 30 to 70 wt%, B2O3: 1 25 Al2O3: 0 10 Bi2O3: 5 CoO: 0.1 ZnO: 20 at least one of Li2O, Na2O or K2O: wt% total, ZrO2 up other optional ingredients. The can be used as a blue coloured on-glaze enamel relies upon the presence Co2+ in network-forming position produce colour, with oxygen donors such ZnO?2?, alkaline earth oxides alkali increasing amount cobalt occupying positions, provide chemical durability.