Abstract
A low-pressure plasma spray (LPPS) coating of a commercial NiCoCrAlY(Ta) alloy on Inconel alloy MA 6000 was examined metallographically after 500 h of cyclic oxidation and burner rig testing for coating performance and interfacial reactions. Uncoated Inconel alloy MA 6000 was also examined for oxidation and hot corrosion resistance. Bare Inconel alloy MA 6000 has excellent oxidation resistance to 2010 °F (1100 °C) but is subject to internal sulfidation in burner rig testing at 1700 °F (925 °C) and 2000 °F (1095 °C). An LPPS coating of a NiCoCrAlY(Ta) alloy protected the Inconel alloy MA 6000 substrate from oxidation and sulfidation for 312 h at both temperatures but developed appreciable interfacial voiding after 500 h at 2000 °F (1095 °C). Spalling of the coating was observed only on burner rig test specimens run at 2000 °F (1095 °C).
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