Abstract
The alloys used as coatings to protect gas turbine components from high temperature oxidation and from sulfur-related hot corrosion attack are, in most cases, complex multiphase materials, which form complex oxide scales. A study of the effects of alloy composition and microstructure on the mechanisms controlling oxidation of such a system is greatly aided by the use of complimentary information from several microanalytical methods, each of which has its own strengths and weaknesses.In investigations of oxide scales, scanning Auger microanalysis (SAM), in conjunction with Ar-ion milling gives semiquantitative composition vs. sputtering time for each of the phases detected. However, since various metals and their oxides can sputter at different rates, only relative depth scales can be obtained. Rutherford backscattering spectroscopy (RBS), on the other hand, provides absolute depth scales and quantitative composition information for the heavier elements in the specimens.
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