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Non-metallic inorganic materials/ Nichtmetallische anorganische Werkstoffe
High-Temperature Oxidation of NbC and TaC at Low Oxygen Pressures. The oxidation of hot-pressed NbC and TaC was studied between 2000 and 2500K and I O W 5 to t O C 3 mbar oxygen pressure by gravimetric methods. BY CO-formation a metallic surface layer is formed which simultaneously reacts with oxygen forming volatile metal oxides. A steady-state layer thickness is reached if the rates of layer formation and metal evaporation are equal. Far away from the steady-state conditions the weight loss and the metal layer thickness deviate essentially from the values predicted by a reaction model. This suggests that for Va metal carbides the model should be modified by considering the early stage of the oxidation 24 ref.
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