Corning Incorporated
White, opaque, .beta.-spodumene glass-ceramic articles with tunable color 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: 62-75 SiO.sub.2; 10.5-18 Al.sub.2O.sub.3; 5-14 Li.sub.2O; 2-12 B.sub.2O.sub.3; and 0.4-2 Fe.sub.2O.sub.3. Additionally, these glasses and glass-ceramics can exhibit the following criteria: a ratio: .times..times..times..times. ##EQU00001## between 0.8 to 1.5. The glass-ceramics also exhibit colors at an observer angle of 10.degree. and a CIE illuminant F02 determined with specular reflectance of a* between -0.5 and 0.5, b* between -2.5 and +2, and L* between 90 and 93.