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Article
Microstructural Study of Copper-Carbon Composite Interface

Author: A.A.R. Abdullah
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2010 Volume: 6 Issue: 2 Pages: 25-29
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Graphite is a very attractive candidate for copper-metal matrix composites. However, copper does not wet graphite, which makes the production of copper-graphite composites difficult. Because of the strong possibilities of these combinations in forming highly desirable composites, copper-carbon composites prepared by hot uniaxial pressure were investigated. The copper-carbon interface is of the samples was examined microscopically using optical microscopy. The observed microstructure at copper interface is composed of copper-carbon interaction layer. The adhesion between copper and graphite was achieved. However, there is no intimate contact between copper and graphite film at interface. To determine the diffusion of carbon through copper matrix by X-ray diffraction was used.


Article
Effect of Addition SiC Particles on the Hardness and Dry Sliding Wear of the Copper-Graphite Composite

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Abstract

This research have been devoted to copper-graphite particulate compositeswhich have high thermal/electrical conductivities and excellent dry lubrication forsolid contacts and sliding that arise from a synergetic composite effect betweencopper and graphite. They have been widely used in their engineering application forsliding components, such as electrical brushes and bearing .This research is devoted tostudy the effect of addition of SiC particles at different weight percentage(1%, 1.5% ,2% and 2.5% ), to the copper graphite composite as matrix, which consist of (90 wt%copper – 10 wt% graphite), on the resistance wear under dry sliding condition byusing pin-on-disk technique and hardness, the structure produced by powdermetallurgy methods (P/M). The results showed that the composite material reinforced with SiC particles has wearrate lower than that of the base composite where, the wear rate of the base compositeis (2.58 × 10-7), which is become (0.6×10-7) after addition of SiC at (2.5 wt% SiC),and the results of hardness for the base composite are (25, 7.61) in Vickers test and Brinell test which respectively become (60, 44) after addition of (2.5 wt% SiC).

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