Ablation in different heat fluxes of C/C composites modified by ZrB2-ZrC and ZrB2-ZrC-SiC particles

Carbon/carbon composites modified by ZrB2-ZrC-SiC particles (C/C-Z-SIC), C/C-Z and C/C were ablated by oxyacetylene torch using two different heat fluxes to investigate the effect of doped ceramic particles. Results indicated that C/C-Z-SiC had the best ablation property in heat flux of 2.38 MW/m(2) whereas their ablation rates increased fastest when heat flux rising from 2.38 to 4.18 MW/m(2). C/C composites had the poorest ablation property in the lower heat flux and their ablation rates increased slowest. Thermal mismatch of Z, SiC and C and evaporation of SiO2 induced the various ablation behavior. (C) 2013 Elsevier Ltd. All rights reserved.