Plasma Spray Coatings for Superalloys

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Superalloys are well known materials forhigh temperature applications. Although thesuperalloys have adequate mechanical strength atelevated temperatures, yet they often lack resistanceto oxidizing/corroding environments during long timeexposures. One possible way to combat the problemconstitutes the use of protective coatings on thesuperalloys. Among the various techniques used fordeposition of coatings, plasma spraying is aversatile technology that has been successful as areliable cost-effective solution for many industrialproblems.In the present book, high temperatureoxidation behavior of some Ni- and Fe- basedsuperalloys has been explained with and without theapplication of plasma sprayed coatings in air, aswell as, in a simulated boiler (Na2SO4-60%V2O5)environment.Characterization and high temperatureoxidation behavior of four coatings, Ni-22Cr-10Al-1Y(NiCrAlY), Ni-20Cr, Ni3Al and Stellite-6 has beenelaborated with the help of Optical microscopy, Scanning Electron Microscopy/Energy DispersiveSpectroscopy and Electron Probe Micro Analysis.Theeffectiveness of the coatings has been discussed onthe basis of weight change data.