Corning Incorporated
White, opaque, .beta.-spodumene glass-ceramic articles with inherent damage resistance and methods for making the same

Abstract:

Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit .beta.-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 60-75 SiO.sub.2; 10-18 Al.sub.2O.sub.3; 5-14 Li.sub.2O; and 4.5 B.sub.2O.sub.3. The glass-ceramics also have a Vickers initiation crack threshold of at least about 25 kgf.