This paper evaluates the effect of bond coat oxidation on the coating life of graded, duplex, and triplex TBC systems deposited on Inconel 617 and 738 substrates by vacuum plasma spraying. In oxidation experiments, the triplex system had the lowest number of cycles to failure. The graded system was found to be superior to the duplex system in terms of oxidation resistance, but inferior in terms of hot corrosion resistance. It was also found that the various TBC systems are more durable on Inconel 738 than on Inconel 617, particularly the graded systems. Paper includes a German-language abstract.

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