Application to laser sealing of lead-free glass composed of V2O5-ZnO-BaO-TeO2

This study aimed to develop a lead-free sealing glass applicable to sealing of the soda-lime glass. The sealing glass should ideally possess the following properties: (i) low melting point, (ii) low thermal expansion and (iii) high water durability. To obtain these essential properties, we prepared glasses with combinations of four different metal oxides (V2O5, ZnO, TeO2 and BaO) and evaluated their properties. Lead-free glasses (41.9 wt% V2O5-7.0 wt% ZnO-30.1 wt% TeO2-21.0 wt% BaO, V-8-Te30) containing 15wt% Zr2(WO4)(PO2)4 is a black-colered sealing glass with low melting point. Further, the glass had the most suitable properties as sealing glass. The glass was useful for sealing of sode-lime glass using laser. We report the result that hermetically sealed soda lime glasses at laser irradiation speed of 0.25 mm/s and output 4.83 W.