2015 Volume 41 Issue 2 Pages 162-166
We prepared and evaluated the heat characteristics, thermal expansion, water durability, transparency, and sealing strength of glasses comprising 30–80 mol%Li2B4O7, 10–40 mol%BaO, and 10–40 mol%P2O5. Addition of Al2O3 to the Li2B4O7–BaO–P2O5 glasses was found to improve their transparency. In particular, glass comprising 53.0 mol%Li2B4O7, 15.2 mol%BaO, 7.6 mol%P2O5, 24.2 mol%Al2O3 (LiBaP+24.2Al) had high transparency, high water durability, and a low thermal expansion coefficient equal to that of soda lime glass without the addition of a low thermal expansion ceramic filler. Furthermore, the LiBaP+24.2Al glass had high sealing ability (6.64 kgf/cm2) compared to lead glass (1.63 kgf/cm2).