Corning Incorporated
Glass-ceramics and methods of making the same

Abstract:

A glass-ceramic includes SiO.sub.2 from about 50 mol % to about 80 mol %, Al.sub.2O.sub.3 from about 0.3 mol % to about 15 mol %, B.sub.2O.sub.3 from about 5 mol % to about 40 mol %, WO.sub.3 from about 2 mol % to about 15 mol %, and R.sub.2O from about 0 mol % to about 15 mol %, wherein R.sub.2O is one or more of Li.sub.2O, Na.sub.2O, K.sub.2O, Rb.sub.2O and Cs.sub.2O. A difference in the amount of the R.sub.2O and the Al.sub.2O.sub.3 ranges from about -12 mol % to about 2.5 mol %.