Abstract
Fe-based composite coating doped well-dispersed titanium boride (TiB2) and carbon nanotubes (CNTs) was fabricated via combined ball milling, spray drying, plasma spheroidization and high velocity air fuel (HVAF) spraying. The microstructure evolution of composite powders and coating, the tribological and corrosion behavior of Fe-based metallic, Fe-TiB2 cermet and (Fe-TiB2)/CNT composite coatings were investigated. The results show that doping 50 vol. % TiB2, especially further doping 2.5 vol. % CNTs could remarkably render the coating favorable microstructure with low porosity, enhanced hardness and fracture toughness, and superior wear and corrosion resistance. Mild oxidative and slight abrasive wears were the dominant wear mechanism, and the preferential corrosion was occurred at the pores, inter-splats and then the TiB2-Fe interfaces.
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