Ablation behavior and mechanisms of 3D C_f/ZrB_2-SiC composite applied in long-term temperature up to 2400 °C

摘要

To evaluate the long-term ablation behavior and mechanism of carbon fiber reinforced ultra-high temperature ceramics, 3D C-f/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 T-max = 2440 degrees 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 SiO(2 )and next porous ZrO2 layer, leading to superior ablation resistance with linear and mass ablation rates of 1.8 x 10(-4) mm/s and 1.08 x 10(-5 )g/mm(2.)s, respectively.