In this research, the effect of adding chromium carbideickel chrome to stellite 6 powder in High Velocity Oxygen Fuel (HVOF) coatings was investigated. For this reason, the various amounts of chromium carbideickel chrome powder (10%, 20% and 30 wt. %) were mixed with stellite 6 powder by mixer without ball and then, mixed powders was deposited on Inconel-617 substrate with HVOF process. Microstructure, porosity, morphology and phase analysis of powders and coatings were evaluated by using optical microscope, scanning electron microscope and X-Ray Diffraction. Coatings hardness and toughness were determined by micro and macro Vickers hardness test. In order to evaluate tribological properties of the coatings, ball on disk wear test were performed in 1000 m with 40 N load in ambient and 600 degree of centigrade temperatures. Also, the cyclic oxidation test at 800 degree of centigrade in 50 hours time was performed to determine the coatings oxidation resistance. Results show that coatings hardness increased with increasing of chromium carbideickel chrome reinforcement. Stellite 6-30 wt. % chromium carbideickel chrome coating had the highest wear resistance than others. Study of wear surface topography by SEM indicates the formation of oxide layer on the wear track which contributed to reduction of friction coefficient and increasing of coatings wear resistance. The oxide layer tends to be formed at high temperatures therefore, chromium increasing in coatings will facilitate the formation of this layer. Wear mechanism was mainly delamination wear. Results of oxidation test show that Steliite 6- chromium carbideickel chrome had the highest oxidation resistance due to low porosity and low interfacial between coating matrix and reinforcement. As well as, weight gain follows the parabolic law. Because of porosity and interfacial between coating matrix and reinforcement, weight gain rate is high at the beginning of oxidation test. Vice versa, this rate decreased gradually due to formation of layer which include different oxides and spinnels that closed oxygen diffusion paths. Keywords: Stellite 6, Wear test, Oxidation, Chromium Carbideickel Chrome, HVOF
