Kinetics of Oxidation of Composite Materials Based on Discrete Carbon Fibers

Resumo

We present the results of investigation of the kinetics of oxidation of a composite material based on discrete carbon fibers and modified phenol formaldehyde resin. According to the results of thermal analysis performed under the conditions of oxidizing medium, we proposed a model of oxidation of separate components and the composite as a whole. The processes of oxidation of fibers and resin are realized in one and two stages, respectively. At the same time, the composite material is characterized by the three-stage realization of the process of oxidation. According to the computed parameters of the reaction, we plotted the isotherms for the interval 220 – 300°C with steps of 10°C and holding for up to 5 h. It was established that, for 300°C, the process of oxidation leads to the loss of the initial mass of the composite that does not exceed 5% for 5 h.