Abstract
CoNiCrAlY powders were thermal sprayed using plasma (atmospheric plasma spraying) and high velocity oxyfuel procedures onto AISI 310 austenitic stainless steel specimens in order to study the cyclic oxidation behaviour of these coatings in air and in a simulated gas turbine environment (10% oxygen) at 800 and 1000°C. The oxidation behaviour and hardness evolution of both coatings were significantly different, and the observed weight gain for the plasma spray coating was always much greater due to the presence of substantial open interconnected porosity. In both cases, protective alumina (Al2O3) and spinel CoAl2O4 layers were created.
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