Ablation resistance properties of ultra-high temperature composites C/C-SiC-ZrB2 by slurry impregnation method

The ultra-high-temperature composites C/C-SiC-ZrB2 were prepared by slurry impregnation method. The composites consist of the carbon fiber as the reinforced phase, C and SiC as the matrix, and the micro-particle ZrB2 as the ultra high temperature phase. The ablation resistance properties of the composites were assessed by arc wind tunnel testing. The ablation mechanism was studied through XRD, SEM and EDS measurements. The results indicate that compared with C/C-SiC composites, the C/C-SiC-ZrB2 composites show better ablation resistance properties, and the properties increases with the content of ZrB2 increase. A ZrO2-SiO2 glassy melting layer formed at high temperature plays an important role in antioxidant ablation.