Journal
CORROSION SCIENCE
Volume 153, Issue -, Pages 170-177Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.02.030
Keywords
CoNiCrAlY/h-BN coating; Abradable coatings; Thermally grown oxides; High temperature oxidation resistance
Funding
- Safran Aircraft Engines (Site de Corbeil, Evry, France)
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The oxidation resistance of a thermally sprayed CoNiCrAIY/h-BN abradable coating was studied at 750 and 900 degrees C. First, the high porosity of the abradable coating was carefully characterised in order to estimate the specific surface area of the coating, required to evaluate the oxidation kinetics. Then the formed oxides were investigated by XRD, Raman spectroscopy and SEM. At 900 degrees C, the mass variations exhibited a deviation from parabolic behaviour due to rapidly growing oxides. Meanwhile, at 750 degrees C, after a transient state, the oxidation rate reaches a steady state, indicating that a protective alumina scale was maintained at this temperature.
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