WHITE, OPAQUE, ß-SPODUMENE GLASS-CERAMIC ARTICLES WITH TUNABLE COLOR AND METHODS FOR MAKING THE SAME

摘要

Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit -spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO2; 10.5-18 Al2O3; 5-14 Li2O; 2-12 B2O3; and 0.4-2 Fe2O3. Additionally, these glasses and glass-ceramics can exhibit the following criteria: a   ratio  :  [ Li 2  O + Na 2  O + K 2  O + MgO + ZnO _ ]  [ Al 2  O 3 ] between 0.8 to 1.5. The glass-ceramics also exhibit colors at an observer angle of 10° 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.