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A platinum-aluminide environmental coating has been subjected to simulated operating thermal cycles normally encountered in land-based gas turbines. The oxidation was undertaken in a mixture of gas with 6 vol.% steam. The specimens were subject to long term cycles (1000hrs) at temperatures 850°C, 900°C, 950°C and 1050°C for up to ten cycles. Growth of the thermally grown oxides with thermal exposure...