Cerammable mineral glass, glass-ceramic articles and...

Details Cerammable mineral glass, glass-ceramic articles and... Cerammable mineral glass, glass-ceramic articles and...

2006-07-04

2006-07-04

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S007000, C501S069000

Reexamination Certificate

active

07071131

ABSTRACT:
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: SiO265–70; Al2O318–20.5; Li2O 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; Na2O 0–<1; K2O 0–<1; with Na2O+K2O 0–<1;with⁢⁢2.8⁢⁢Li2⁢O+1.2⁢ZnO5.2⁢⁢MgO>1.8;TiO21.8–3.5; ZrO20.8–2.5;with⁢⁢2.2<TiO2ZrO2<4.5;⁢preferably⁢⁢2.3<TiO2ZrO2<4.5;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.

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