Abstract
Degradation of materials due to solid particle erosion is encountered in a large variety of engineering industries. In such environments, protective coatings are frequently used. In the present investigation, Ni–22Cr–10Al–1Y coating was deposited on Superni 75 and Superni 600 (Ni-based Superalloys) by a shrouded plasma spray process. The coatings have been characterized for microstructure, porosity, microhardness, X-ray diffraction and electron probe micro analysis. Erosion studies were conducted on plasma spray coated superalloy specimens using an air-jet erosion test rig at a velocity of 40 m/s. Titanium, iron and manganese have been noticed in small but uniformly distributed concentrations in the coatings, indicating the probable diffusion of these elements from the substrate. The NiCrAlY coating on Superni 600 gave the lowest erosion rate. The erosion was found greater during the transition period prior to achieving a steady-state erosion conditions for both the coatings. The possible erosion mechanisms are discussed.
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