چکیده
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Hybrid Cu-SiC composites have been highly considered in order to achieve a combination of electrical and
thermal properties along with high strength and wear resistance. However, limited investigations have ever been
conducted over the effects of using hybrid (combination of nano and micro size) particles on the wear resistance
behavior of these composites. Hence, in the present study, Cu-SiC nanocomposite with 4 vol% nanosize and 4 vol
% microsize SiC, and Cu-SiC microcomposite with 8 vol% micro- SiC were fabricated through mechanical milling
and hot pressing process. Results revealed the homogeneous dispersion of SiC particles in the matrix, high
densification, and ultrafine-grain matrix for the samples. The hybrid nanocomposite showed higher wear resistance,
lower friction coefficient and enhanced compressive strength in comparison to the microcomposite. The
presence of hybrid particles caused a significant decrease of 61% in the matrix grain size, 53% decrease in the
width of wear track, and 35% increase in the compressive strength compared to the nanostructured Cu sample.
Investigation of the worn surfaces showed that delamination is the predominant wear mechanism in the Cu-SiC
composites. Using hybrid SiC led to decreasing the formation of cracks and pits, and plastic deformation in the
worn surfaces.
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