A CoWSi/WSi2 coating was cladded on a nickel substrate using Nd:YAG pulsed laser. Microstructure and composition of the coating were characterized by X-ray diffraction (XRD) as well as scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The microstructure evaluations demonstrated that a uniform free cracks coating was formed, which metallurgically bonded to the substrate. XRD and EDS analysis results showed that some Ni dilution occurred at the coating/substrate interface and that the coating consisted of CoWSi, WSi2 and γ-Co. Cyclic oxidation behavior of the coating indicated that the CoWSi/WSi2 coating could effectively prevent the oxidation of nickel at 1100 1C in air up to 40 h. The oxide scale was composed of CoO, SiO2, WO3 and NiCo2O4.
