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— The Zinc–Aluminium (ZA) family of casting alloys are gaining wide commercial importance as journal bearing material for high load and low speed applications. These alloys, most notably ZA-27 is capable of replacing traditional bronze bearing at low cost. Recently, the ZA-27 alloy has been substituted for conventional journal bearing materials in a wide range of industrial applications. The journal bearings produced from these alloys have been used in earthmoving equipments, mining and milling machines, cable winches and compressors. The ZA-27 alloys and the bearings were also used in heavy and dusty environments such as underground machines, ore crashers and rock drills.The tribological properties of the ZA 27 alloy were tested using a Pin-on-Disc friction and wear tribotester.Sliding wear tests were performed using the tribotester by varying load, speed & sliding distance. The same tests are done with lubricating condition and also with bio lubricants. The Bio-lubrication is adopted in this work because of its biodegradability and eco-friendly nature. Especially the soya bean oil possess good lubrication properties. The wear rate of dry, base oil and bio lubricant oil condition were determined different applied load, speed and sliding distance compared with each other.

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The tribological properties of metal matrix composites (MMC’s) is of interest in several applications like bearing sleeves, piston and cylinder liners, aircraft brakes etc. The wear behaviour of unreinforced as well as B4C particles reinforced phosphor-bronze alloy composite material is studied as a function of sliding speed and applied loads under un-lubricated conditions. The content of B4C particles in the composite was varied from 1-6% in steps of 2% by weight. A pin on disc wear testing machine was used to evaluate the wear rate, in which cast iron disc was used as the counterface. Loads of 10-30N in steps of 10N and speeds of 1.30, 1.83 and 2.30 m/s was employed. The results indicated that the wear rate of both the composites and the matrix alloy increased with increase in load and sliding speed. However, the composites exhibited lower wear rate than the alloys.