Abstract
Abstract The beneficial effects of active element additions to both overlay coatings and β -NiAl intermetallics are well documented in the literature. The addition of such elements has been noted to increase the adherence of a protective oxide scale, decrease the oxide growth rate and improve the mechanical properties of the oxide. The present study aimed to assess the effects of the ion implantation of either Hf or Y to a platinum aluminide on a MarM002 substrate, to determine whether the additions would act to improve the coating's performance under hot oxidation conditions. The samples were isothermally exposed to laboratory air for 100, 250 and 500 h at 1100 °C. Their performance was assessed by comparing the oxide growth rate, adherence and composition to that formed by an untreated coating. The additions were found to have had no observable effects on the performance of the coating, promoting oxides that had a similar adhesion, growth rate and composition as were formed on untreated systems. However, the study did reveal the detrimental effects of excessive hafnium peg formation and their role in the degradation of the coatings.
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