Ablation behavior and mechanisms of 3D Cf/ZrB2-SiC composite applied in long-term temperature up to 2400 °C

Abstract

To evaluate the long-term ablation behavior and mechanism of carbon fiber reinforced ultra-high temperature ceramics, 3D Cf/ZrB2-SiC composite with homogeneous architecture was prepared via vibration-assisted slurry impregnation combined with precursor infiltration and pyrolysis. The intact structure of sample was remained owing to the triple oxide layers after ablation at Tmax = 2440 °C for 500 s, a dense ZrO2 layer owing to particle accumulation and sintering, followed by a dense SiO2+ZrO2 layer due to inhibition in diffusion of glassy SiO2 and next porous ZrO2 layer, leading to superior ablation resistance with linear and mass ablation rates of 1.8 × 10−4 mm/s and 1.08 × 10-5 g/mm2·s, respectively.