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, Li2B4O7, ZnO, and BaO were used to prepare lead-free sealing glasses with a low melting temperature. Glass transition temperature, softening temperature, and thermal expansion coefficients were measured in detail in the ternary systems (Li2B4O7-ZnO-BaO). The glass forming region, thermal stability, and surface morphology were evaluated. The dependencies of these properties on composition were quantitatively characterized. The ternary system glass (57.1 mol%Li2B4O7-33.9 mol%ZnO-8.97 mol%BaO) exhibited a low melting property, expedient thermal expansion coefficient, an amorphous structure, and good sealing properties. Especially, the ternary lead-free glass (25.6 mol%Li2B4O7-17.8 mol%ZnO-56.6 mol%BaO) showed the lowest glass transition temperature. To date, as borate glasses with the lower melting property are not developed, lead-free glasses proposed in this study will be epoch-making sealing materials for electronic products.
