Abstract
The well-documented differences in performance of platinum-modified aluminide coatings are studied in the light of the unique structural and diffusional features of these systems. Changes in the platinum and substrate element concentration and in the NiAl phase matrix lattice parameter suggest that one important function of the platinum is the rapid self-healing of the formed oxide scale owing to aluminum diffusion to the surface. Results of these analyses are reviewed in the light of exposition test data and theories.
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