Abstract
The purpose of the paper was to determine the influence of cyclic oxidation parameters on oxidation kinetics, morphology, thickness and phase composition of oxide layers formed on Ti–6Al–7Nb alloy. The value of the activation energy of the process of cyclic oxidation of Ti–6Al–7Nb alloy was determined based on Arrhenius diagram. The result was 175.4 kJ/mol. The paper demonstrates that cyclic oxidation of Ti–6Al–7Nb alloy allows the formation of good-quality oxide layers, which, depending on the oxidation temperature, differed significantly in surface morphology. After oxidation at 600 °C, the obtained oxide layer was characterised by the presence of fine oxide particles, which often formed into shapes resembling grains. Oxidation at 700 °C led to the formation of larger agglomerated oxide particles. The cyclic oxidation process made it possible to obtain oxide layers of higher thickness compared to the isothermal oxidation method. After cyclic oxidation at 600 °C an oxide layer twice as thick (0.44 μm) was obtained. However, after oxidation at 700 °C, the obtained layer was approximately 55% (1.63 μm) thicker. Examinations of the phase composition of the oxide layers obtained at 600 and 700 °C showed the presence of three phases: α-Ti, TiO2 (rutile) and Al2O3.
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