Effect of Burn-off on Oxidation Rate of Nuclear Graphite

The air oxidation performance of IG-110 grade nuclear graphite was investigated at 600-750℃ using thermal-gravimetric method,and the effect of burn-off on the oxidation rate was analyzed.Applying the Random Pore Model,the microstructrual parameters of nuclear graphite IG-110,H-451,NBG-18 and NBG-10 were determined,and the burn-off factor formulas were fitted.Results indicated that the maximum oxidation rate of IG-110 graphite occurred at ~35% burn-off,and the microstructrual parameters increased with the mean grain size of different types of nuclear graphite.