Abstract
The microstructure of a Pt-modified γ-γ′ bond coat on CM-247LC Ni-base superalloy has been examined and its cyclic oxidation performance at 1100 °C in air is comparatively evaluated with that of a conventional β-(Ni, Pt)Al bond coat. The γ-γ′ bond coat was effective in imparting oxidation resistance to the CM-247LC alloy for about 100 h, whereas the β coating imparted oxidation resistance for significantly longer duration of about 1000 h. The nature of surface damage that occurred to the γ-γ′ coating during oxidation has been compared with that reported in the case of β coating.
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