| 摘要 |
glass ceramic materials. SUBSTANCE: polycrystalline glass has the following components, wt.-%: SiO2, 57.0-70.0; Li2O, 12.7-19.0; NaPO3, 2.0-4.0; K2O, 1.7-2.5; CaF2, 0.9-1.2; LiF, 4.0-8.0; CeO2, 0.1-1.0; TiO2 0.1-9.0; CaO, 0.1-4.0; MnO/MnO2 = 0.1-4.0; Al2O3, 0.1-4.0. High-strength polycrystalline glass is founded from lithium-silicate glass at 1300-1350 C, formation of specimens to cold form is carried out from temperature 1300-1350 C, annealing at temperature 400-420 C and thermal treatment after annealing is carried out by two-stage regimen: temperature rise to 480-520 C, keeping for 2-3 h, temperature rise to 680-720 C at the rate 1-4 degrees per minute, keeping at indicated temperature for 1-2 h followed by natural cooling to the room temperature. Obtained low-melting polycrystalline glass exhibits high strength parameters in combination with low density and can be used under conditions of extreme loadings. EFFECT: improved quality and properties of glass ceramic. 2 cl, 1 tbl
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