Investigation of oxidation resistance of carbon based first-wall liner material Aerolor AO5

Oxidative erosion of graphite in air between 600 and 1000K

“…Such a tendency has also been previously observed for NS31 and N112 [26,28,29] and results from the widening of the pore system, i.e., from increasing the effective surface area. The rates before the increase are plotted in Fig.…”

“…Both accident scenarios may produce combustible gases (H 2 , CO) and release radioactive material (tritium, activated dust). Investigations on such accident analyses [20,[26][27][28][29][30] were carried out above 900 K, where the in-pore diffusion of the gases is the rate limiting process. At higher temperatures (>1200 K), the mass transfer to and away from the surface is the slowest step and, as a result, the erosion is only slightly temperature dependent [21,28,31,32].…”

Practical aspects for characterizing air oxidation of graphite

“…Even so, this form of kinetic equation (based on regime 1) is not robust enough to accommodate all factors that may vary during the course of oxidation at large weight loss levels, including the 'induced surface heterogeneity and the continuously developing porosity in the material [21]. For practical reasons, and in view of the increased interest in high temperature applications of graphite (regimes 2 or 3), surface-normalized rates were used by more researchers [1,3,12,[22][23][24][25] than mass-normalized [26][27][28] or volume-normalized [9,18] rates.…”