Abstract
The oxidation kinetics of boron carbide pellets were investigated in steam/argon mixtures in the temperature range 1200–1800°C for steam partial pressures between 0.2 and 0.8bar and total flows (steam+argon) between 2.5 and 10g/min resulting in gas velocities from 1.01 to 5.34m/s. A kinetic model for boron carbide pellet oxidation depending on temperature, steam partial pressure and flow velocity is obtained. The activation energy of the oxidation process was determined to be 163±8kJ/mol. The strong influence of temperature and steam partial pressure on the boron carbide oxidation kinetics is confirmed. The obtained data suggest the coexistence of two kinetic regimes, one at 1200°C and the other at 1400–1800°C, with different dependence on steam partial pressure.
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