Abstract
The oxidation behavior of two superalloys (CMSX2 and IN100) protected by low-plasma-pressure-sprayed MCrAlYTa coatings (M = Co, Ni) was studied with emphasis on the kinetics and microstructural aspects. The oxidation behavior of each alloy (substrate and coating) was studied separately in order to obtain a better understanding of the oxidation mechanism of duplex systems (coated substrate) under both isothermal and cyclic conditions (mainly at 1100°C and in 1 atm O2). Although all these systems develop an alumina scale, differences were observed as a result of several factors: (1) the coating and substrate composition, thus the presence, amount and distribution of addition elements (Y, Ta, Ti, C,...); (2) the interdiffusion phenomena that induce microstructural modifications; and (3) the porosity amount and roughness of the coating. The system that appears to be the most resistant against cyclic oxidation consists of CoNiCrAlYTa-coated IN100. This cannot be explained by the present study. Further work was conducted, particularly on the oxidation stresses, as described and discussed in paper II.
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Huntz, A.M., Boumaza, A. & Moulin, G. Improvement of the oxidation resistance of superalloys by low-pressure, plasma-sprayed MCrAlYTa coatings. I. Oxid Met 30, 141–183 (1988). https://doi.org/10.1007/BF00666595
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DOI: https://doi.org/10.1007/BF00666595