Abstract
ABSTRACTIn the present study, the effects of microwave sintering (MWS) on microstructural, tribological and corrosion properties of Cu0.7Ni0.3-5 wt-% Al2O3 nanocomposites were evaluated. The Cu and Ni powders along with Al2O3 nanopowder were mixed in a high-energy ball mill. The XRD patterns indicating formation of Cu0.7Ni0.3 solid solution alloy during mechanical alloying process. The mechanically alloyed powders were compacted by coldpress, and sintered samples at 200 and 300°C for 30 and 60 min by means of conventional sintering and MWS. Tribological properties of sintered samples were evaluated by ball-on-disk wear test. For MWS, results indicate that increasing the MWS temperature decreased the wear rate about 30%. Corrosion behaviour of nanocomposites were studied by cyclic potentiodynamic polarisation in 1 M NaOH solution and was found that corrosion current density of microwave sintered sample was decreased almost 35 times of that for conventional sintered sample.
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