Glass and glass-ceramic materials, articles and method of...

Details Glass and glass-ceramic materials, articles and method of... Glass and glass-ceramic materials, articles and method of...

2006-12-26

2006-12-26

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S007000

Reexamination Certificate

active

07153795

ABSTRACT:
The present invention relates to novel glass and glass-ceramic materials, articles made from said novel glass-ceramics and to methods of preparing said novel glass-ceramics and articles. Said novel, transparent, translucent or opaque glass-ceramics, which contain, as main crystalline phase, a solid solution of β-quartz or of β-spodumene, essentially have the following composition, expressed as percentages by weight of oxides: 65 to 70% of SiO2; 18 to 23% of Al2O3; >4 to 5% of Li2O; 0 to <1% of MgO; 1 to 3% of ZnO; 0 to 2% of BaO; 1.8 to 4% of TiO2; 1 to 2.5% of ZrO2; 0.4 to 1% of K2O and/or Na2O; with, advantageously, an effective and non-excess amount of at least one fining agent. The glass-ceramic material is also characterized by a water content of β-OH higher than 0.2 mm−1, preferably higher than 0.4 mm−1.

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