Even be glazed, lithium disilicate glass ceramic containing.

摘要

This invention relates to glass-ceramic articles containing lithium disilicate crystals as the predominant crystal phase and consisting essentially, in weight percent, of 8-19% Li.sub.2 O, 0-5% Na. sub.2 O, 0- 7% K.sub.2 O, 0-8% Na.sub.2 O+K.sub.2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2- 12% Na.sub.2 O+K.sub.2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al.sub. 2 O.sub.3, 1. 5-11% ZnO+Al.sub.2 O.sub.3, with a molar ratio (Na.sub.2 O+ K.sub.2 O) (ZnO+Al.sub.2 O.sub.3) between 0.075-1.25, 65-80% SiO.sub.2, and as a nucleating agent 1.5-7% P.sub.2 O.sub.5 and/or 0.0001-0.1% Pd. Glass- ceramics having certain compositions within those ranges are self- glazing.