Oxidation and ablation resistance of ZrB2–SiC–Si/B-modified SiC coating for carbon/carbon composites

ZrB2–SiC–Si/B-modified SiC coating was prepared on the surface of carbon/carbon (C/C) composites by two-step pack cementation. The coating could efficiently provide protection for C/C composites from oxidation and ablation. The improvement of oxidation resistance was attributed to the self-sealing property of the multilayer coating. A dense glassy oxide layer could afford the high temperature up to 2573 K and efficiently protect C/C composites from ablation.

► ZrB2–SiC–Si/B-modified SiC coating was prepared on the surface of C/C composites.
► The coating can effectively protect C/C composites from oxidation and ablation.
► The self-sealing property improves the oxidation resistance of the coating.
► The dense glassy oxide layer can afford the high temperature up to 2573 K.