Abstract
Ablation mechanism and properties of SiCf/SiBCN ceramic composites under an oxyacetylene torch ablation environment were investigated. Ablation products mainly consist of amorphous SiO2 glass and cristobalite. Four time-dependent ablation actions contribute to the various ablation regions: oxidations of SiC fibers and SiBCN matrix, erosion of SiC fibers in the center region, evaporation of SiO(g) and B2O3(g), and high-viscosity SiO2 liquid flowing with ablation gas-stream. Meanwhile, the mass ablation rate and linear ablation rate of SiCf/SiBCN are notably lower than those of Cf/SiBCN.
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