High Temperature Oxidation of C/C-Composites and Their Components from Viewpoint of Material Design
Akimitsu Miyazaki, Isao Tomizuka, Shizuo Nakazawa, Yutaka Koizumi
Aimed at establishing relationship between oxidation kinetics between C/C-composite materials (CCCMs) and the components from view points of material design, rates of oxidation were observed on 3 carbon fibres, 3 carbon-from-resins and 9 CCCMs from each pair of the fibres and the resins. The rates for the CCCMs were almost identical when the CCCMs were composed of an identical origin, although the consumption during the first half period of the oxidation was seen in the matrix carbon. The rate of a CCCMs was not given by a rule of mixture of those of the components, while the activation energy of the rates was given by one. This is explained by assuming that the oxidation mechanism is inherent to each fibre and matrix carbon, that each mechanism operates independently in the CCCMs, and that the number of the active centre in the CCCMs is controlled by a factor of the fibre. The factor to control the number of the active centre remains, however, to be investigated.