Abstract
The environmental protection of aircraft engine high-pressure turbine blades is dependent upon the formation of a thin, slow-growing, external alumina scale. The adherence of alumina (Al2O3) scales to superalloys or coatings has been shown to be improved by adding an oxygen-active element (Y) or by desulfurization. Studies will be presented that show that cast surfaces are contaminated with sulfur and are more susceptible to high-velocity oxidation than machined surfaces regardless of an oxygen-active-element addition. In addition, the positive effect of oxygen-active elements and desulfurization on the performance of a single-crystal and directionally solidified Ni-base super-alloy in a 1149°C cyclic oxidation test and a 927°C/5 ppm sea-salt Type-I hot-corrosion test will be discussed.
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Schaeffer, J.C., Murphy, W.H. & Smialek, J.L. The effect of surface condition and sulfur on the environmental resistance of airfoils. Oxid Met 43, 1–23 (1995). https://doi.org/10.1007/BF01046745
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DOI: https://doi.org/10.1007/BF01046745