2022/03/14 by Samaneh Nasiri, Nasiri, Samaneh, Shi, Feng +7
Engineering · Materials Science · #Aluminum Alloys Composites Properties #Magnesium Alloys: Properties and Applications #Tribology and Wear Analysis
paper · pdf · doi:10.48550/arxiv.2203.07340
Multiwalled carbon nanotubes (MWCNTs) are decorated with Pt nanoparticles by\na "layer-by-layer" approach using poly (sodium 4-styrene sulfonate) (PSS) and\npoly (diallyl dimethylammonium chloride) (PDDA). Transmission electron\nmicroscopy (TEM) images and Energy Dispersive X-Ray (EDX) analysis of the\nsamples confirm Pt deposition on surfaces of CNTs. Dispersibility and\ndispersion stability of MWCNTs in the solvents are enhanced when MWCNTs are\ncoated with Pt nanoparticles. Mg AZ91 composites reinforced with MWCNTs are\nthen produced by a melt stirring process. Compression tests of the composites\nshow that adding 0.05 % wt Pt-coated MWCNTs in AZ91 improves the composite's\nmechanical properties compared to the pure AZ91 and pristine MWCNT/AZ91.\nFracture surface analysis of the composite using a scanning electron microscope\n(SEM) shows individuals pulled out MWCNTs in the case of the Pt-coated\nMWCNT/AZ91 composites. We attribute this finding to the uniform dispersion of\nPt-coated MWCNTs in Mg due to the improved wettability of Pt-coated MWCNTs in\nMg melts. Molecular dynamics (MD) simulations of the interaction between\nPt-coated MWCNTs and Mg support this interpretation.\n