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Abstract
High-temperature oxidation behaviour of FeCrAl(Y, Pt) alloys was studied in oxygen and oxygen – water vapour (47 vol%) for 18 ks at 1473, 1573 and 1673 K, by mass gain measurements, the amount of spalled oxide, X-ray diffraction, scanning electron microscopy and field emission-transmission electron microscopy – energy dispersive spectroscopy. After oxidation at 1473K for 18 ks in oxygen, the mass gain of the FeCrAl alloy with appropriate addition of both yttrium and platinum was the smallest value, and alumina – alloy interface of the alloy showed good coherency by TEM. After oxidation at 1673K in oxygen – water vapour (47 vol%) for 18 ks, the amount of spalled oxide of FeCrAl0.5Pt alloy was zero. This result is thought to relate to the formation of concentrated platinum layer at the oxide – alloy interface. Spalling of oxide scale on FeCrAl and FeCrAl0.1Y alloys was observed, however, oxide scale on FeCrAl0.5Y alloy showed good adherence during five cycles (one cycle=18 ks) in oxygen – water vapour (47 vol%) at 1573 K.