A series of experiments is described on the oxidation of hot pressed monolithic TiN, in static air, over the temperature range 400° to 1100°C. Several oxidation regimes, dependent on temperature and time, were observed for which different oxidation mechanisms are proposed: Diffusion controlled parabolic behaviour (700°-800°C). Inhomogeneous diffusion through surface microcracks (900°C and the first stage at 1000°C). Diffusion through a continuous oxide scale (early stage at 1100°C). Logarithmic law behaviour (longer time oxidation at 1000° and 1100°C). Activation energies were calculated as 254 kJ/mole for 700°-800°C and 190 kJ/mole for 900°-1000°C. At 1000° and 1100°C the oxide scale was founded to consist of preferentially oriented TiO2 crystals.
|Original language||English (US)|
|Number of pages||3|
|Journal||British ceramic. Transactions and journal|
|State||Published - Dec 1 1991|
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