Glass material, glass ceramic product, and process for producing the glass material

摘要

A SiO2-Al2O3-Li2O component-based glass material, which comprises, as basic components, SiO2: 60-63 wt%; Al2O3: 23-25 wt%; and Li2O: 4-5 wt% and, as modifying components, ZrO2 : 1.5-2.5 wt%; TiO2: 0.5-2.5 wt%; MgO: 0.5-1.5 wt%; ZnO: 0.5-1.2 wt%; Na2O: 0.5-2.0 wt%; and K2O: 0.5-2.0 wt%, and further comprises any one of BaO: 0.5-1.0 wt, CaO: 1.0-2.0 wt%, and B2O3: 0.01-1.0 wt%. This can be reheat-formed in a glass state and has a low thermal expansion coefficient.