TRANSPARENT LITHIUM ALUMINOSILICATE GLASS-CERAMICS MADE WITH ENVIRONMENTALLY FRIENDLY ALTERNATIVE REFINING AGENTS Russian patent published in 2016 - IPC C03C10/04 C03C10/14 

FIELD: ceramic industry.

SUBSTANCE: present invention relates to transparent glass ceramic with low thermal expansion. Transparent glass ceramics contains following, wt%: SiO₂ 35-70; Al₂O₃ 17-35; Li₂O 2-6; TiO₂ 0-6; ZrO₂ 0-6; TiO₂+ ZrO₂ 0.5-9; ZnO 0.5-5. Glass ceramics produced by clarification using SnO₂ and at least one additional clarifier, wherein additional clarifier is selected from Sb₂O₃, SO₄ ^2-, Br^- and Cl^-, in molar ratio from 1:2 to 2:1. Glass ceramics has coefficient of thermal expansion of 0±0.10·10^-6k in temperature range from 0 to 50 °C and contains one or more crystalline phases, selected from group consisting of high-temperature quartz mixed crystals of high-temperature quartz keatite, mixed keatite crystals, beta eucryptite.

EFFECT: technical result consists in production of glass ceramics with thermal expansion close to zero.

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