Influence of rotational speed, angle of impingement, concentration of slurry and exposure time on erosion performance of HVOF sprayed cermet coatings on 35CrMo steel

Abstract

The efficient use of coal for power generation has been one of the country's largest challenges. The various investigators have been attempting for several years to substitute crude oil as a liquid fuel by coal slurries. Thus, significant material loss due to the wear of erosion is caused by the different mechanical elements, such as pipelines, pumps, bends, many others in mining, thermal and petroleum. Therefore to improve the lives of such materials, it is most important to research the effect of slurry erosion parameters that influence erosion rate. In this study, we propose the WC-10Co coatings coated by the High Velocity Oxy-Fuel (HVOF) technique on a 35CrMo steel substrate, commonly used in hydraulic turbines, have been examined for slurry erosion. The coating structures were examined using SEM and XRD methods. In addition, the slurry erosion experiments were performed on the coatings to explore the influence of rotational speed, angle of impingement, concentration of slurry and time on erosion behaviours. Findings indicate that the rotational speed was the most significant parameter determining the mass loss of the coatings followed by the angle of impingement, slurry composition, and time.