Corning Incorporated
BLACK LITHIUM SILICATE GLASS CERAMICS

Abstract:

A black lithium silicate glass ceramic is provided. The glass ceramic includes lithium silicate as a primary crystal phase and at least one of petalite, .beta.-quartz, .beta.-spodumene, cristobalite, and lithium phosphate as a secondary crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: -1.0 to 1.0, and b*: -5.0 to 2.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.