Improvement of Carbon Composite Material Refractoriness Due to Limitation of Surface Oxidation

Resumo

Ways of improving the refractoriness of carbon-carbon composite materials due to increasing their density and reducing oxidation rate, and in turn due to reducing the combustion surface, are studied. Oxidation heterogeneous reaction surface in an Arrhenius equation expression is considered as the sum of object outer surface and the reaction surface within pores. It is shown that with an apparent density of 1.93 g/cm³ or more surface oxidation at normal pressure and ~500 °C almost corresponds to the nominal object surface. Processing measures are suggested for improving carbon material refractoriness due to an increase in density and changing surface structure by special high-temperature treatment regimes.