Abstract
The experiment studied the effect of chromium on the oxidation resistance of nanostructured cobalt-aluminum coatings, deposited on superalloy Superni-718 by magnetron sputtering. For this, the cobalt-aluminium coated superalloy was subjected to similar conditions of cyclic oxidation at 1173 K as the cobalt-alumimium coated samples with chromium. Further, the influence of substrate temperature on the properties of coatings was examined by comparing the coatings deposited at substrate temperatures of 773 and 973 K during magnetron sputtering. Post-cyclic oxidation tests, the examination of the surface morphology and phase formations was carried using X-Ray Diffraction and Field-Emission Scanning Electron Microscope/Energy Dispersive Spectroscopy. The coating containing chromium displayed the maximum resistance to cyclic oxidation in comparison to the coatings without chromium, as is apparent from the variation in mass per unit area of the superalloy. Further it was observed that increasing the substrate temperature in magnetron sputtering significantly augments the high temperature resistance of the coatings.
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