In order to explore the feasibility and ablation behavior of the three-dimensional needled C / SiC in the hybrid rocket ramjet,the C / SiC composite nozzle was experimentally investigated.The results show that the three-dimensional needled C / SiC composite nozzle can work safely under the oxygen-rich combustion environment of the ramjet for long test duration.No obvious oxidation is observed in the entrance and divergent section of the nozzle.Thermochemical ablation is the dominated ablation mechanism for ...