Corning Incorporated
Glass-ceramic articles, compositions, and methods of making the same

Abstract:

A glass-ceramic article that includes an article having a glass-ceramic composition, the composition including: SiO.sub.2 from about 45% to about 65%, Al.sub.2O.sub.3 from about 14% to about 28%, TiO.sub.2 from about 2% to about 4%, ZrO.sub.2 from about 3% to about 4.5%, MgO from about 4.5% to about 12%, and ZnO from about 0.1 to about 4% (by weight of oxide). The article can include a coefficient of thermal expansion (CTE) of about 20.times.10.sup.-7 K.sup.-1 to about 160.times.10.sup.-7 K.sup.-1, as measured over a temperature range from 25.degree. C. to 300.degree. C.