Investigation of microstructure and mechanical properties of HVOF spray coatings of WC-12wt%Co and WC-12wt%FeAl

This paper deals with the investigation of microstructure, phase structure and microhardness of steal substrate coated with WC-(Co/FeAl) powders by HVOF spray system. For this purpose, samples were evaluated by metallographic studies, microhardness measurements and X-ray diffraction analysis. The results indicated that both coating structures are uniform and the porosity was low. The microhardness of WC-FeAl coating is higher than WC-Co,which is caused by the higher hardness of Iron Aluminide in comparison to cobalt. Evaluation of the coatings showed that the binder has a significant impact on mechanical properties.