Ablation behavior of nose-shaped HfB ₂ -SiC modified carbon/carbon composites exposed to oxyacetylene torch

Nose-shaped C/C-H fB ₂ -SiC with good mechanical property were fabricated by PIP. During ablation in 2.38 MW/m ² using oxyacetylene torch, the composites showed good ablation performance and structural stability. Because of the nose-shaped feature, protective ablation products including borosilicate glass, HfO ₂ -glass and HfO ₂ scale covered on the surface according to their distances to the nose tip, which were beneficial for enduring the heating conditions. As heat flux increased to 4.18 MW/m ² , more serious ablation occurred, and the protective performance degradation of the ablation products accelerated, especially at the nose tip, the partly ruptured HfO ₂ layer was difficult to withstand the enhanced denudation.