Abstract
A Press-forming method was studied for glass in the system based on CaO-MgO-SiO2. The softening temperature of glass with a diopside composition (CaO・MgO・2SiO2) was 832℃. This glass shows good viscous flowability at 830〜880℃. The strain rate under 850℃ was 1.3 mm/min at 0.35 MPa. A press-forming furnace was designed for the semi-automatic press forming and crystallization. Glass ingots 10 mm in diameter were formed and crystallized under 5 kgf at 840〜860℃ for 30〜50 min in the conventional quartz investment. The glass ingot can be pressed into a sheet (0.36 mm thick), meshes or dental MOD inlay shape under pressure of 0.64 MPa.
