Crystallized glass building material and its production manner

摘要

PURPOSE:To enable production of a readily cuttable and large-sized crystallized glass building material by wet pulverizing a glass frit containing specific amounts of K2O, BaO, MgO, Al2O3, SiO2 and F, casting and forming the pulverized frit, drying and calcining the formed body. CONSTITUTION:A glass fit having a composition consisting of at least 10-30wt.% K2O, 5-25wt.% BaO, 10-30wt.% MgO, 3-15wt.% Al2O3 and 5-15wt.% F is wet pulverized. The resultant pulverized frit is then cast formed, dried and calcined under conditions of about 900-1,100 deg.C for =about 30min to deposit =30vol.% mica crystals in the resultant crystallized glass. Thereby, the objective crystallized glass building material readily cuttable with normal metal working tools is obtained.