Significant improvement of the self-protection capability of ultra-high temperature ceramic matrix composites

The oxidation behaviour of Cf/ZrB2-SiC with different fibre architectures, manufactured by slurry impregnation, polymer infiltration and mild pyrolysis, was investigated. Short term oxidation tests in air were performed for 1 min and 5 min at 1500 degrees C and 1650 degrees C in a bottom loading furnace. Microstructure, oxide scale thickness and composition were analysed by SEM/EDS/XRD. Results indicated that a good dispersion of ZrB2 particles in the polymer derived SiC(O) matrix promoted the formation of compact scales filling surface holes left by fibre oxidation. 20-30 vol% of ZrB2 in the material was found a good compromise between lightness and oxidation resistance.

Automated summary

The oxidation behavior of Cf/ZrB2-SiC materials with different fiber architectures was investigated, showing that the good dispersion of ZrB2 particles in the polymer-derived SiC(O) matrix promoted the formation of compact oxide scales. It was found that a ZrB2 content of 20-30% in the material was a good compromise between lightness and oxidation resistance.