High-temperature oxidation of titanium carbide
A study was made, in experiments of 5 h duration, of the high-temperature oxidation of TiC in air at 500–1200° C. The resultant oxidation products were subjected to metallographic and x-ray diffraction examinations. It was established that, when TiC reacts with oxygen, the most probable is the reaction yielding oxides and carbon, which builds up under the scale layer.
Thermodynamic calculations were performed of the equilibria in the systems titanium carbideoxygen (nitrogen) in the temperature range 298–2000°K. It was found that, from a thermodyanmic point of view, TiC in oxygen and nitrogen atmospheres may be unstable right up to 1800°K.
The role of carbon in the TiC oxidation process was investigated, and it was established that carbon promotes the sintering of the scale layer and stabilizes oxide phases (anatase).
Metallographic and x-ray diffraction analyses revealed that the scale forming during the oxidation of TiC contains metallic titanium. This observation confirms the validity of a complex model of the defective structure of oxide layers, postulating preferential diffusion of interstitial cations at high temperatures.
KeywordsTitanium Carbide Oxide Layer Oxide Phase Thermodynamic Calculation
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