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KAGAKU KOGAKU RONBUNSHU, Vol.37, No.2, 197-202, 2011
Lead-Free Sealing Glasses in the Ternary System V2O5-Li2O-TeO2 and Evaluation of Their Thermal, Waterproof and Sealing Properties
Lead-free glasses with low melting point, low thermal expansion, and waterproof durability are desirable for the sealing process in the ceramic and electronic fields. In this study, V2O5, Li2O,and TeO2 were used to prepare lead-free sealing glasses with low melting temperature. The glass-forming region, glass transition temperature, softening temperature, crystal precipitation temperature, thermal expansion property, and X-ray confirmation were investigated in detail for the ternary (V2O5-Li2O-TeO2) system. The dependencies of these properties on composition were quantitatively characterized. The ternary system glass (10 40 mol%V2O5 0 40 mol%Li2O-30-70 mol%TeO2) had a low melting property and an amorphous structure. Addition of a low thermal expansion ceramic filler, Zr-2(WO4)(PO4)(2) (ZWP), to the prepared lead-free glasses yielded glasses with a similar coefficient of thermal expansion (7.0-8.0 x 10(-6) degrees C-1) to plain soda lime glass. In particular, glass prepared with 80 wt% V-Li-Te-12 (10 mol% V2O5-20 mol% Li2O-70 mol%TeO2) and 20 wt% ZWP had an excellent waterproof durability and adhesion strength of 1.6 kgf/cm(2).