GLASS FOR GLASS CERAMIC MATERIAL Russian patent published in 1995 - IPC

FIELD: building and architecture. SUBSTANCE: glass for glass ceramic material has, wt.-%: SiO₂ 35-57; TiO₂ 0.01-20; Al₂O₃ 0.01-15; Fe₂O₃ 0.01-15.13; FeO 0.01-3.66; CaO 12.02-27.05; MgO 5-20; Na₂O 0.14-10; K₂O 0.01-4.45; ZrO₂ 0.01-6, and at least one component from the group: MnO 0.01-4.65; Cr₂O₃ 0.01-1; CoO 10.01-0.5 and at least one component from the group: Li₂O 0.01-3.35; P₂O₅ 0.01-1.11. Glass is melted at 1350-1375 C. Shaped articles were subjected for thermal treatment at 750-800 C for 0.5-7 h to provide crystallization process of surface glass layer and relief figure formation. By chemical stability articles belong to the first hydrolytic class, their thermal stability is 600-850 C, strength is 60-100 kg/mm². EFFECT: enhanced quality of glass. 2 tbl