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 β-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:; $$ \frac{\left[{\mathrm{Li}}_2O+{\mathrm{Na}}_2O+K_2O+\mathrm{MgO}+\mathrm{Zn}O\right]}{\left[{\mathrm{Al}}_2O_3\right]}$$ 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.