The Effect of Platinum and Aluminum Deposition by Sputtering-Ion Beam Technique on the Formation and Microstructure of Platinum Aluminide Coatings

Platinum aluminide coatings are used on ni- base superalloys in order toimprove their oxidation and corrosion resistance and they are essential forfabrication of high temperature superalloy parts i.e. turbine blades. in the presentstudy, the formation of platinum aluminde coatings on nickel-based superalloys wasinvestigated. in this study, sputtering ion beam technique under argon plasma wasused for deposition of platinum and aluminum layers and subsequent heat treatmentapplied to fabricate these coatings.characterization of coatings shows some resemblance with the results of otherinvestigations but coatings also show some special features also. microstructure ofcoatings reveals that interdiffusion occurs and essential compounds formed but ithas some irregularities also, which can be related to sputtering method as well assurface treatment. diffusion of nickel and platinum through thickness made fourdifferent aluminum compounds in the coating which some of them were notcharacterized well in previous investigations.