Vol. 9 No. 1
Year: 2013
Issue: Aug-Oct
Title : Characterization of Cold-Sprayed Nicocraly Coatings on Fe-Based Superalloy and Hot Corrosion Behavior in Na2SO4-Nacl Environment
Author Name : Sukhminderbir Singh Kalsi, T.S. Sidhu , Harminder Singh
Synopsis :
In the present study cold spraying was used to deposit and NiCoCrAlY coating on Fe-based Superfer 800H superalloy and coating was successfully deposited with cold spray process. As sprayed coating was tested for microhardness, thickness and microstructure. The hot corrosion behavior of the bare and coated superalloy is evaluated in Na2SO4-10% NaCl environment at 900°C under cyclic conditions. The microstructural characteristics of the corrosion products were investigated with XRD, SEM, EDAX and Elemental X-Ray Mapping. The cold sprayed NiCoCrAlY coating perform better as compare to bare superalloy against hot corrosion degradation. Dense coating structure obtained by the cold spray technique and protective oxide layer on the top are responsible for better performance of the coating.
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