Crystallized glass
AssigneeNippon Electric Glass Co., Ltd.
InventorsTakahiro Matano, Yuki Yokota, Atsushi Tanaka, Yoshihisa Takayama
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Abstract
Provided is a crystallized glass, which has a high fracture toughness value, and besides, is excellent in transparency. The crystallized glass includes, in terms of mass %, 40% to 70% of SiO2, 5% to 40% of Al2O3, 2% to 25% of B2O3, 0% to 15% of MgO+ZnO, 0% to 20% of CaO+SrO+BaO, 0% to 8% of P2O5+TiO2+ZrO2, 1% to 20% of Na2O+K2O, and 0% to 6% of Li2O, has a crystallinity of from 1% to 50%, and has an average visible-light transmittance of 50% or more at a thickness of 0.8 mm and a wavelength of from 380 nm to 780 nm.
Claims8
A crystallized glass, comprising, in terms of mass %, 40% to 70% of SiO2, 5% to 40% of Al2O3, 3% to 25% of B2O3, 0% to 15% of MgO+ZnO, 0% to 20% of CaO+SrO+BaO, 0.1% to 8% of P2O5+TiO2+ZrO2, 1% to 20% of Na2O+K2O, 0.1% to 8% of ZrO2, and 0% to 6% of Li2O, having a crystallinity of from 1% to 50%, having an average visible-light transmittance of 50% or more at a thickness of 0.8 mm and a wavelength of from 380 nm to 780 nm, and having zirconia crystals precipitated as a main crystal phase.
Dependencies are inferred from the claim text.