Abstract
The present work discusses the comparative wear behavior of composite (amorphous/nanocrystalline) blast furnace pig iron coatings deposited on a mild steel substrate using high velocity oxygen fuel and air plasma spray techniques. The study has been carried out using a ball-on-disk tribometer with the coated specimen and tungsten carbide ball as disk and counter body, respectively. A composite structure, consisting of both amorphous and nanocrystalline phases, has been confirmed by x-ray diffraction and transmission electron microscopy. It has indicatively been shown that the wear resistance of the mild steel substrate could be improved using composite coatings due to the higher micro-hardness of the coatings. Indirect tribo-oxidation involving oxidized debris has been found to be the dominant wear mechanism.
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