Accommodation factors and mechanisms for the destruction of carbon- and ceramics-based composite materials

We present results of theoretical studies of the mechanism for the destruction of heat-resisting composite materials. We study processes caused by the interaction of oxygen atoms and molecules with silicon dioxide and silicon-dioxide-based materials with the inclusion of chemical processes in the intermediate layer between the gas and the composite material surface in rarefied media. We show that the destruction mechanism depends on the catalytic activity controlling the dynamics of various physicochemical processes with the participation of O and O$_2$ on the surface. We obtain the resulting characteristics of the destruction of glassy materials, which are determined by the action of two mutually converse processes to some extent. We analyze the main regularities of the destruction of glassy materials. We show that the recombination rate depends significantly on the enthalpy of the gas flow stopping. Numerical calculation results show that the process of nonequilibrium mass carryover can be calculated using the engineering approach.