Transparent glass-ceramic material containing lithium, having a low coefficient of thermal expansion, a substantially amorphous, lithium-deficient, mainly glassy surface area, and a high transmittance, its production in an aqueous atmosphere And use

摘要

A lithium-containing, transparent glass-ceramic material is provided. The material has low thermal expansion and has an amorphous, lithium-depleted, vitreous surface zone. The zone is at least 50 nm thick on all sides and encloses a crystalline interior, which has high transmission. The material includes a transition region connecting the zone and the interior.