Oxidation resistance of reactive plasma cladding high-chromium iron-base composite coating

The sucrose was used as a carbonaceous precursor to prepare composite powders of Fe-Cr-C-W-Ni by the precursor carbonization-composition process.And the powders were fused to form a high-chromium iron-base coating on the surface of hardened and tempered grade C steel(C≤0.35%)with the optimum reactive plasma cladding process.SEM,XRD and EDS were employed to study compositions and microstructures of the coating.The oxidation resistance of the ceramal composite coating was investigated under the testing condition of 900℃ and 50 hours.The results indicate that the excellent oxidation resistance of the coating is mainly attributed to the relatively continuous oxide scales which mainly consist of Cr₂O₃ and Fe₂O₃,and the oxide scales can prevent the inner part of the composite coating from being further oxidized.