2007 年 14 巻 329 号 p. 207-213
Lead-free glasses with a low melting point and good chemical durability are desirable for the sealing process in the ceramic and electronic fields. In this study, V2O5, ZnO, and TeO2 were used to prepare lead-free sealing glasses with a low melting temperature. The glass forming region, thermal stability, and surface morphology observation were investigated. Glass transition temperature, softening temperature, and thermal expansion coefficients were measured in detail in the ternary systems (V2O5-ZnO-TeO2). The dependencies of these properties on composition were quantitatively characterized. The ternary system glass (33.5 mol% V2O5-18.7 mol% ZnO-47.8 mol% TeO2) exhibited a low melting property, expedient thermal expansion coefficient, an amorphous structure, and good sealing properties. The lead-free glass had especially low glass transition temperature (=216°C), high thermal stability (ΔT= 145°C) and low sealing temperature (=350°C). In a sealing examination with a plane fluorescent lamp incorporated in a digital camera, we succeeded in achieving excellent sealing. The prepared lead-free glass exhibited a high performance as a substitute for the commercially available lead glass.