Potassium-zinc silicate glass used in the production of a dental molded product contains oxides of silicon, lithium, potassium and zinc

摘要

Potassium-zinc silicate glass contains (in wt.%): 60.0-72.0 silica, 1.0-5.0 lithium oxide, 10.0-23.0 potassium oxide and 8.5-20.0 zinc oxide. Preferred Features: The glass additionally contains (in wt.%): 0-4.0 sodium oxide (Na 2O), 0-4.0 magnesium oxide (MgO), 0-3.6 calcium oxide (CaO), 0-3.0 strontium oxide (SrO), 0-8.0 aluminum oxide (Al 2O 3), 0-3.3 boron oxide (B 2O), 0-3.0 lanthanum oxide (La 2O 3), 0-6.0 zirconia (ZrO 2), 0-2.5 titania (TiO 2), 0-2.0 cerium oxide (CeO 2), 0-5.0 tin oxide (SnO 2), 0-1.0 phosphorus oxide (P 2O 5), 0-1.8 terbium oxide (Tb 4O 7), and 0-1.1 fluorine (F). The glass does not crystallize during thermal treatment in the region of 600-800[deg]C for 1 minute to 1 hour. The glass has a sintering temperature of less than 800, especially 760[deg]C or less, and has a linear thermal expansion coefficient of less than 12.3 x 10 - 6 K - 1 measured in the region of 100-400[deg]C. The glass additionally contains an apatite glass ceramic containing (in wt.%): 56.0-65.0 silica (SiO 2), 1.8-5.3 lithium oxide (Li 2O), 9.0-16.0 zinc oxide (ZnO), 3.5-10.5 calcium oxide (CaO), 2.0-6.0 P 2O 5 and 0.5-1.0 F.