Development of the Al2O3-B2O3-SiO2 glass for thermal barrier coating

Glass coating is an important thermal insulation technique used in the aerospace industry that serves as a thermal protection system (TPS) to protect the inner layer at elevated temperatures. This work highlights the superb mechanical and thermal properties of the B 2 O 3 -SiO 2 glass systems as a surface coating for space shuttle. In the B 2 O 3 -SiO 2 system, the glass transition temperature raises from 650 °C to 750 °C with increasing SiO 2 content and devitrification of the α-cristobalite phase. The Al 2 O 3 addition in B 2 O 3 -SiO 2 glass can increase the glass transition temperature from 750 °C to 1000 °C and inhibit the α-cristobalite phase. The phase transition from an unstable α-cristobalite phase to an amorphous phase was achieved at 10 wt% Al 2 O 3 -added specimens. This study demonstrates that the Al 2 O 3 -B 2 O 3 -SiO 2 glass (ABS glass) exhibits thermally stable behavior, making it an effective thermal barrier coating at elevated temperatures.