Structure of Bi₂O₃-ZnO-B₂O₃ system low-melting sealing glass

Abstract

Bi₂O₃-ZnO-B₂O₃ system glass is a kind of lead-free low melting sealing glasses. The structure of Bi₂O₃-ZnO-B₂O₃ system low-melting sealing glass was investigated by DSC, FT-IR, XRD and SEM. The results show that with the increase of B₂O₃ content, the transition temperature T_g and softening temperature T_f of Bi₂O₃-ZnO-B₂O₃ system low-melting sealing glasses increase, which leads to the liquid phase precipitation temperature increasing and promotes the structure stability in the glass. With increasing the heat treatment temperature, a large number of liquid phases appear in samples and the sinter efficiency of the samples increases. The FT-IR spectra of the glasses show the presence of some bands that are assigned to vibrations of Bi—O bond from [BO₃] pyramidal and [BiO₆] octahedral units and B—O from [BO₃] and [BO₄] units. With the decrease of B₂O₃ content, the crystallization tendency of the glass increases. In glass samples B₁ and B₂, crystallization starts at 460 °C and 540 °C, respectively. Both of them precipitate Bi₂₄B₂O₃₉ phases.

Keywords

Bi₂O₃-ZnO-B₂O₃ system glass / low-melting sealing glass / transition temperature / softening temperature

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