Experimental Study of High Velocity Oxygen Fuel Sprayed Cr3C2- Ni-Cr-B-Si Coatings on Inconel 718 Using Design of Experiments

Abstract

In the present study, D-optimal based mixture design of experiments (DoE) is used to find the optimum powder mixture for High Velocity Oxygen Fuel (HVOF) coating. Twenty five experimental trials are performed by varying the powder mixtures based on mixture design. Cr3C2, Ni, Cr, B, Si powder mixtures are deposited on Inconel 718 substrate by HVOF process.The responses porosity and hardness are determined by the cross-sectioning the specimens.The effect of powder mixtures on coated samples are characterized by X-ray diffraction, optical microscope, Vickers hardness tester and Scanning electron microscope.The optimal powder mixture is determined to obtain minimum porosity and maximum hardness and the confirmatory experiment confirms with the predicted results. From the analysis it is observed that Cr3C2, Ni and Cr are the major factor which influences the porosity and hardness followed by B and Si respectively.