Tribological and cicrostructure characteristics of WC-12Co/FeNiCrMo composite coating by HVOF process
Researchers found that using a high velocity oxyfuel (HVOF) system to create an improved temperature resistant iron-based (FeNiCrMo) composite coating on a boiler steel substrate significantly improves tribological and microstructural properties.
In the current study, a high-velocity oxyfuel (HVOF) system is used to generate an enhanced temperature sliding wear-resistant iron-based (FeNiCrMo) composite coating on a boiler steel substrate. FeNiCrMo (70%) and WC-12Co (30%) were mechanically mixed prior to coating utilizing the ball-milling technique. The HVOF system later used feedstock to create the coating. The coating samples were put through the necessary metallurgical and mechanical characterization processes. With pin-on-disc equipment, additional substrate and coating samples were acquired for a wear test without the need of lubrication. By using 10-N and 20N loads at room temperature and 200°C and 300°C conditions, wear tests were conducted.
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The speed and sliding distance were held constant. Using SEM and XRD techniques, the worn-out samples were examined for microstructural changes and phase formation. Calculations were made for the wear parameters of the friction coefficient, wear rate, and volume loss. Hard phases including Cr3C2, Ni3C, W2C, Fe2C, and SiC, as well as intermetallic phases like Mo2C and Co3W3C, may be seen in the deposited coating. As a result, the hardness has increased and the wear resistance is improved compared to the substrate.
