Surface Optimization of ZrC–SiC Inner Layer to Enhance Ablation Property of SiC/ZrC–SiC Multi-Layer Coating for C/C Composites

A ZrC–SiC inner layer was fabricated on carbon/carbon composites by pack cementation at different temperatures, aiming to prepare a transition for subsequent deposition of SiC and chemical vapor plasma spray. Results show that the structure phase composition significantly affected interface bonding strength thermal shock resistance multilayer, which played vital role in resisting ablation. The jagged porous surface led forming root-like pinning interface, generating sawtooth combination between layers. Moreover, with high content decreased coefficient expansion mismatch outer Therefore, enhanced ablation optimum coating attributed improved caused rough structure.