In the present work, the relationship between the cavitation resistance of WC-Co based coatings and the thermal spraying parameters of the HVOF process was studied. The coatings were manufactured using DJH-2600 gun, which works with hydrogen and oxygen as combustion gases. The spraying process was automatized. Three repetitions were obtained for each projection condition to verify the experiments' repeatability. The resistance to cavitation was evaluated by the indirect test of the ASTM G-32 standard. The roughness of the coatings, its surface morphology and microstructure were studied with the aid of contact profilometer, SEM and optical microscopy. The porosity of the coatings was measured by digital image processing and the analysis of the phases present in the coating was carried out by XRD. Subsequently, the data obtained were correlated with the projection parameters to find the best spraying recipe. It was found that the total combustion flux was the parameter that had the strongest effect on every evaluated property, while the combustion ratio (RC) did not have a statistically significant effect on the levels evaluated in the experimental plan. It was possible to improve the cavitation resistance of the WC-Co based coatings using high levels of FTC and a combustion ratio close to the stoichiometric point.
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