首页|Wet ball milling and subsequent high-speed selective laser sintering of Nb–Cu powders for applying wear-resistant coatings
Wet ball milling and subsequent high-speed selective laser sintering of Nb–Cu powders for applying wear-resistant coatings
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NSTL
Elsevier
? 2022 Elsevier LtdThe work investigates niobium-carbohydride- and copper-based powders prepared via wet ball milling of niobium and copper in petroleum ether, including their phase composition evolution under heat treatment. High-speed selective laser sintering of the prepared powders on iron substrates provides gradient coatings ~70 μm thick. The outer layer of the coating contains phases of NbC0.75, Nb2C, (Fe,Nb)6C, Cu, and Fe, whereas the 10-μm layer adjacent the substrate shows the presence of NbC0.75, (Fe,Nb)6C, Fe2Nb, Сu, and Fe. Dry friction with a WC–Co counterbody does not cause wear of the coatings, and the friction coefficient being ~0.6. High wear resistance of the coatings results from their structure including regions containing nanosized niobium carbides (50–500 nm) with a hardness of ~11 GPa, regions of Fe + Fe2Nb eutectic reinforced with niobium carbide inclusions with a hardness of 6.5 GPa, and copper inclusions working as a solid lubricant in tribological tests.
CoatingsCopperHardnessLaser sinteringNiobium carbohydride and carbidesWear resistanceWet ball milling
NSTL
Elsevier
