A novel Ti3SiC2-CaB6 modified Al-coated carbon fiber/boron phenolic resin ceramizable composite (ACF/BPRC) with excellent long-term oxidative corrosion resistance and high temperature load-bearing capacity

Carbon fiber/phenolic composites (CF/Ph) are susceptible to oxidation failure. In this work, Ti3SiC2-CaB6 modified ACF/BPRC was prepared, and its long-term (20 min) oxidation resistance in a broad temperature range (600–1400 ℃) was investigated. The mass residual rate at 1400 ℃ and flexural strength post static ablation at 1400 ℃ for 20 min was 90.9% and 41.8 MPa, respectively. The ceramizable composite underwent ceramization reactions and was converted to ceramized composite, and a thermal protection barrier composed of TiO2, TiC, TiB2, SiC, Al2O3, and molten Al and calcium borate was constructed. Thus, the long-term oxidation resistance and high-temperature load-bearing capacity was enhanced notably.