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FABRICATION AND MECHANICAL CHARACTERIZATION OF COPER-GRAPHITE METAL MATRIX COMPOSITES

Aman Chaudhary, Adarsh Kumar


A Copper-graphite metal matrix composition posses the properties of copper likes as excellent thermal electrical conductivity & low strength and graphite likes as solid lubrication, small thermal expansion coefficient. There are some many application likes as bearing material and brushes due to its good thermal & better electrical conductivity, also favorable self- lubricating performances on the bases of strength. In copper graphite, low percentage of the graphite is also uses for connectors, plugs & relays, switches, slip-rings & low-voltage dc machine with very high current density.When added a solid lubricant particle into a material, then improve not only anti- friction properties but also improve wear and friction property. In this present investigation, attempts have been made for the fabrication of copper-graphite MMC by conventional & spark plasma sintering technique. Copper-graphite MMC obtained by mixture of 2, 4, 6 &11% volume of graphite powder into copper powder by conventional powder metallurgy route. The metal matrix cold into a closed press & sintering into tubules furnace using vacuum chamber unto 60 minute at 700oC temperature.The MMC are characterised by X-ray diffraction & scanning electron microscopy process. Different mechanical properties likes bulk hardness, density & wear study also conducted. To study the impression of milling, Cu-2% volume of graphite & also Cu-4% volume of graphite powder mixture are milled for different time period and then it’s sintering. Then, its shows increase hardness with milling. The microscopy of Cu-graphite has show the good compatibility & clear interface. So its show that, graphite particle is uniformly (not a randomly) distribution into whole copper matrix. To study of wear, it’s concluded that the wear resistance of metal matrix composite material increased with increased in graphite particle due to its lubricating properties of graphite. It’s also show that, wear depth flow decreased with increased in graphite particle. So samples are higher wear resistance. It’s also found that compress strength increased with adding of extra graphite up to 6% but compression strength are decreased further addition of graphite due to increased in brittle property in metal matrix composite. Composites are exciting content that are looking for increasing applications in defence, transportation, electricity, electronics, communication, entertainment, sports, aerospace, many other commercial & consumer product.