Decorative enamel for glass-ceramics having low coefficients of thermal expansion

摘要

This invention is concerned with the preparation of thermally crystallizable enamels suitable for application to glass-ceramics, particularly glass-ceramics having coefficients of thermal expansion less than 15×10.sup.-7 /°C. The enamels are capable of being fired to maturity simultaneously with the precursor glass body being crystallized to a glass-ceramic. The enamels consist essentially, expressed in weight percent on the oxide basis, of:PPSiO. sub.2 : 36-58PPAl.sub.2 O.sub.3 : 8.5-16PP CaO: 0.5-10PPPbO: 27-40PPK.sub.2 O: 0.5- 6