Polymer-derived SiOC-barium-strontium aluminosilicate coatings as an environmental barrier for C/SiC composites

Polysiloxanes polymer coatings were formed on carbon fiber-reinforced silicon carbide (C/SiC) composites at 100°C in air with barium-strontium aluminosilicate (BSAS) as fillers. After the polymeric coatings were pyrolyzed at 1350°C under argon, a dense SiOC-BSAS-coated C/SiC composite was obtained. The oxidation test in dry air and the corrosion test in water vapor were carried out on the coated composites at 1250°C, respectively. The results indicated that the polymer-derived SiOC-BSAS coatings could protect the C/SiC composites well both in dry air and water vapor. Even after corroded for 200 h in water vapor, the coated C/SiC composites showed little weight loss and high residual flexural strength.