Abstract
FeCrAlY coatings produced by air plasma spray were post-treated by hot isostatic pressing and by electron beam remelting. The properties studied were thermal shock resistance, oxide scale adherence, fatigue behaviour, ductility, diffusion and corrosion behaviour. The contents of as-sprayed oxides in the coatings were of the order of 10 – 20%. It is shown that lenticular oxides are a very effective interdiffusion barrier. The closing of porosities in the FeCrAlY coating by hot isostatic pressing also prevents oxygen and sulphur in the gaseous state from penetrating the coating. A further diffusion barrier is tantalum in the form of intermetallic phases such as TaNi 3 and TaFe 2. With the air plasma spray (APS) process, lenticular oxides parallel to the substrate surface are produced. Both the body-centred cubic crystal structure of the FeCrAlY coating matrix and the oxides formed during the APS process lower the coefficient of expansion for the coat.
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