Effect of Bi₂O₃ on thermal, chemical durability, and bonding properties of V₂O₅–P₂O₅–TeO₂ glasses for low-temperature sealing glass

抄録

Lead-free low-melting sealing materials are needed in many fields, especially in organic light-emitting diode and Vacuum-Insulated Glass applications. Accordingly, V₂O₅–P₂O₅–TeO₂ (VPTe) glass systems have been invested in as lead-free low-melting sealing materials because of their low coefficient of thermal expansions (CTE) and glass transition temperature (T_g). However, these glasses are vulnerable to moisture. This problem can be overcome by adding bismuth oxide to the VPTe glass system. The addition of 9 mol % of Bi₂O₃ improves water resistance, and causes changes in the T_g increased about 40°C and the CTE decreased about 14 (×10⁻⁷/K) that may reflect the structural changes. As a result, the glasses, which are doped with Bi₂O₃, maintain their low-temperature properties, and they are improved their water resistance about 1.2 × 10⁻⁵ (g/cm²/min).