Abstract
Materials resistant to high temperature corrosion and small particle impact erosion are necessary in the design and construction of energy conversion systems. Al 2O 3-forming M-Cr-Al coatings with active element additions on an IN 738 substrate have exhibited enhanced resistance to erosion damage of their oxide scales owing to improved adherence of the scale. This improvement results from modifications of the scale morphology by the active element additions which encourage pegs of oxide that penetrate into the coating. Other active element additions cause a porous scale to form, increasing the erosion susceptibility. The thin alumina scales behave as a brittle material with the highest erosion rate occurring at an impingement angle of 90° and scale removal occurring by a chipping action.
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