改性C/C-ZrC-SiC复合材料热化学烧蚀数值分析

In this paper, the thermochemical ablation behavior of multiphase ultra-high temperature ceramics (UHTCs) particle doped modified C/C composites was characterized mathematically, and the methods of formula derivation, numerical simulation and experimental verification were used for research and analysis. By analyzing the morphology of C/C-ZrC-SiC (CCZS) composites after ablation, based on the principle of thermochemical equilibrium and minimum free energy, an oxidation ablation model of CCZS was established. Using thermal-mechanical-chemical multi-field coupling numerical analysis method, the simulation model of CCZS material with tapered scale was built, and the expression of thermochemical oxidation reaction was embedded into the simulation model and ablation behavior was numerically calculated. The calculated internal temperature distribution and ablation rate of the ablation structure are in good agreement with the ablation test results, which verifies the validity of the mathematical model. At the same time, the calculation results show that it is feasible to characterize the surface thermochemical reactions of modified composites based on thermochemical equilibrium principle, which can provide theoretical reference for the mathematical characterization of thermochemical oxidation ablation of heterogeneous UHTCs doped modified C/C composites.