The present invention relates to novel mineral glasses which are cerammable and which have a composition, expressed in percentages by weight of oxides, consisting essentially of: SiO.sub.2 65 70; Al.sub.2O.sub.3 18 20.5; Li.sub.2O 2.5 3.8; MgO 0.55 1.5; ZnO 1.2 2.8; BaO 0 1.4; SrO 0 1.4; with BaO+SrO 0.4 1.4; with MgO+BaO+SrO 1.1 2.3; Na.sub.2O 0 <1; K.sub.2O 0 <1; with Na.sub.2O+K.sub.2O 0 <1;.times..times..times..times..times..times..times..times.> ##EQU00001## TiO.sub.2 1.8 3.5; ZrO.sub.2 0.8 2.5;.times..times.<<.times..times..times.<< ##EQU00002## and, optionally, an effective, non-excess amount of at least one fining agent. The present invention also relates to glass-ceramic articles made from such glass as well as processes for making such glass-ceramic articles.
CROSS-REFERENCED APPLICATIONS
The present application claims priority of French Patent Application No. 02 11221, filed on Sep. 11, 2002.
The present application claims priority of U.S. provisional patent application Ser. No. 60/448,900, filed on Feb. 19, 2003, entitled "Cerammable Mineral Glass, Preparation of Glass-Ceramic Articles, Said Articles," the content of which is incorporated herein by reference in its entirety.
