Carbon nanotubes reinforced Al-11 wt% Si alloy via plasma spray

Abstract

In this work, multi-walled carbon nanotubes (MWCNTs) with different portions (0.5, l, 2, 4) wt% were added to a gas atomized Al-ll wt% Si powder. The Al-ll wt% /MWCNTS nanocomposite powder was examined by FESEM, Raman spectroscopy, X-ray diffraction (XRD). Air plasma spraying (APS) was used to spray Al-ll wt% Si/MwCNTs nanocomposite powder on aluminum alloy AA6082-T6 substrates. Al-ll wt% Si/MWCNTs nanocomposite coating layer was examined using FESEM/EDS, Raman spectroscopy, XRD and HRTEM. SEM/EDS showed that Al4C3 is formed at the interface e between the coating layer and the substrate in Al-ll wt% Si/4 wt% MWCNTs plasma spray coating. The adhesion test showed good adhesion in the ranges 5-l5 MPa between the coating layer and the substrate. Microhardness test of the air plasma sprayed (APS) Al-ll wt% Si/MWNTs nanocomposite layer is increased with the MWCNTs wt%.