Visualizations of the carbon interphase influence on the ablated fracture morphology of carbon/carbon composites at pore scale

An ablation model considering reaction kinetics of carbon interphase in carbon/carbon composites is proposed. The proposed model also comprehensively considers the couple of the oxygen diffusion, the movement and reaction heat at the carbon-air interface, the aerodynamic heat on the ablation layer, and the heat conduction in the carbon solid. The pre-exponential factor and the apparent activation energy in the Arrhenius formula is put forward. Simulated ablation morphologies agree well with experimental results. The aerodynamic heat accelerates the formation of reaction morphology. The apparent activation energy coefficient has a greater effect on reaction morphology compared with the pre-exponential factor coefficient. [Display omitted] •An ablation model considering reaction kinetics of carbon interphase is built.•A comprehensive reaction kinetic model of the carbon interphase is proposed.•Effects of complex multiple coupled factors on ablating process are discussed.•Comprehensive model captures structure morphology evolution process well.