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The main drawbacks of the IC engine are low thermal and mechanical efficiencies with a significant proportion of fuel energy is dissipated as heat, and about 12% fuel energy is lost due to friction. Many research works are going on to reduce these losses in IC engine, as, even if, reduction of 10% in total friction loss can be achieved it will result in 1.5% drop in fuel consumption, which will ultimately give huge economic benefit. It has been recently identified, that optimally texturing of a tribological surface reduces friction and wear at sliding contact interfaces, as it acts as a micro-reservoir for lubricant and entraps wear particles. In the present study, this theory is utilized to reduce friction in piston ring-cylinder liner (PRCL) contact by using micro textured piston ring. Tribological performance of micro textured PRCL system is investigated under medium passenger vehicle engine operating conditions using reciprocating tribometer test rig.

The aim of this work is to investigate the synergistic effect of Multiwall Carbon Nanotube (MWCNT) in a Cu/SiC hybrid composite brake friction material. The brake hybrid composite materials were prepared using copper as a matrix, silicon carbide as a reinforcing fibre, graphite as a solid lubricant and barium sulphate as a filler combined with varying volume percentage (0.0, 0.5, 1.0, 1.5 and 2.0) of Multiwall Carbon Nanotube (MWCNT) by conventional powder metallurgy technique. The prepared brake friction materials are characterized for compression strength, density and hardness to analyze their mechanical properties. The friction and wear behaviour of the composite were carried out using a fully instrumented pin-on-disc (PoD) test rig with linear variable differential transducer for wear rate and strain gauge for friction measurement under dry condition for medium duty applications.