High-temperature oxidation of nickel-based alloys and estimation of the adhesion strength of resulting oxide layers |
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Authors: | E. N. Fedorova D. Monceau D. Oquab S. A. Khudonogov |
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Affiliation: | 1.Siberian Federal University,Krasnoyarsk,Russia;2.Institute Carnot, CIRIMAT INPT/UPS/CNRS,ENSIACET,Toulouse,France |
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Abstract: | The kinetics of isothermal oxidation (1100°C) of commercial nickel-based alloys with different content of sulfur (0.22–3.2 wt ppm) is studied. The adhesion strength in a metal/oxide system is estimated as a function of sulfur content and duration of high-temperature exposure. The scratch-test technique is proposed to quantitatively estimate the work of adhesion of resulting oxide films. It is found that the film microstructure is composed of an inner α-Al2O3 layer and an outer NiAl2O4 spinel layer, which are separated by discrete inclusions of TiO2. Residual stresses in the oxide film are experimentally determined by X-ray diffraction. |
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