Effect of heating rate on the heat-transfer characteristics in the thermal decomposition of phenolic carbon plastic

A carbon plastic based on a phenolic binder at heating rates up to $\sim$ 150 K/sec has been investigated by means of electrothermographic and thermogravimetric analysis. The thermokinetic constants for the thermal decomposition and thermophysical characteristics of the material have been studied as functions of the annealing temperature. It is shown that an increased heating rate the temperature dependences of the specific heat and thermal conductivity of the carbon plastic are shifted to the high-temperature region. The results of the study are summarized in the form of universal dependences which allow one, in the mathematical modelling of the thermochemical decomposition of thermal protecting coatings, to take into account the shift of the thermophysical parameter via the change in the material density during thermal decomposition.