Abstract
The glass structure, wetting behavior and crystallization of BaO–Al 2O 3–B 2O 3–SiO 2 system glass containing 2–10 mol% Al 2O 3 were investigated. The introduction of Al 2O 3 caused the conversion of [BO 3] units and [BO 4] units to each other and it played as glass network former when the content was up to 10 mol%, accompanied by [BO 4] → [BO 3]. The stability of the glass improved first and then decreased as Al 2O 3 increased from 2 to 10 mol%, the glass with 5 mol% Al 2O 3 being the most stable one. The wetting behavior of the glasses indicates that excess Al 2O 3 leads to high sealing temperature. The glass containing 5 mol% Al 2O 3 characterized by a lower sealing temperature is suitable for SOFC sealing. Al 2O 3 improves the crystallization temperature of the glass. The crystal phases in the reheated glasses are mainly composed of Ba 2Si 3O 8, BaSiO 3, BaB 2O 4 and BaAl 2Si 2O 8. Al 2O 3 helps the crystallization of BaSiO 3 and BaAl 2Si 2O 8.
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