International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
Tribological Investigation and Development of Tin Based Babbit Composite Material Rajkumar S. Gujar1, Dr. R.R. Navthar 2 PG Scholar, Dept. of Mechanical Engineering, D.V.V.P. college of Engineering, Ahmednagar, Maharashtra, India. 2 Professor, Dept. of Mechanical Engineering, D.V.V.P. college of Engineering, Ahmednagar, Maharashtra, India. ---------------------------------------------------------------------***---------------------------------------------------------------------1
Abstract - In this research work the stir casting method is
used to fabricate babbit metal matrix composite by reinforcing silicon carbide with 2%, 4%, 6% respectively. Wear test was conducted at ambient temperature by using lubricating oil. Pin on disc apparatus was used to conduct wear test by considering different affecting parameters i.e. Normal load, sliding velocity, sliding distance. The specimen pins of composite materials were tested against EN8 disc. Result of wear test is studied and compared with existing babbit. The babbit+2% SiC composite possesses minimum wear rate. The microstructure of composite material after conducting wear test is studied by using Scanning Electron Microscopy. By addition of 2% SiC in Babbit alloy, microstructure get refined which leads to increase in wear resistance. From this study it is concluded that wear resistance is increases by addition 2% silicon carbide as compared to the existing babbit alloy and other composition of material. Key Words: Wear test, B83 Babbit, Pin on Disc, Composite material, Scanning Electron microscopy, Tribology, Metal matrix composites
1. INTRODUCTION The metal matrix composite (MMC) is generally an alloy, not a pure metal. A metal matrix composite is a composite material in which at least two constituent materials, one being a metal. The other material may be a different metal or another material, such as a ceramic material i.e. silicon carbide. The necessity of composite materials has increased, due to the improved physical and mechanical properties. A composite material is a material consisting of two or more physically or chemically distinct phases. The composite generally has good characteristics than those of each of the individual components. The reinforcing component is distributed in the matrix material. Russian grade B83 Babbit is the most popular material for fabrication of journal bearings in Russian engineering. B83 babbit has best bearing material properties such as rapid conformability, good thermal conductivity, high impact viscosity, and compatibility with lubricating oil. However, low fatigue strength and moderate wear resistance decrease the operating life Babbit bearings. Currently, alloys of the Sn–SbCu are widely used as the material for sliding bearings that Š 2017, IRJET
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Impact Factor value: 5.181
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operate in oil i.e. bearings used in sugar industry. They are also applied in hydroelectric power plants to support hydraulic turbines and electric generators. A bearing operates in the steady mode when a lubricating film of a required thickness is formed and retained between the shaft and the bearing. However, under inadmissibly heavy loads and at high velocities of the rotation of the shaft, damage to the bearing often occurs, especially if no oil film of a sufficient thickness appears between the shaft and the bearing. Under these conditions, the shaft and the bearing lining made from a babbit metal can come into partial contact in the course of sliding friction.
2. LITERATURE REVIEW I.E. Kalashnikov, L.K. Bolotova, P.A. Bykov, L.I. Kobeleva, I.V. Katin, R.S. Mikheev, and N.V. Kobernik has developed the fabrication method to B83 babbit using powder metallurgy. The result of resesrch is that structure of the matrix B83 alloy is dispersed and microstructure is changed. [1] D. Venkata rao, M. V. S. Babu, K. Santa rao and P. Govinda rao has experimentally investigated the mechanical behaviour of tin alloy based particulate metal matrix composites. In the present work, Tin alloy based particulate Metal Matrix Composite (MMC) with SiC as reinforcements were prepared. Stir casting was used for fabrication of composite material. Mechanical properties of composite are checked by conducting tensile test and hardness test. [3] Bhaskar Chandra Kandpal, Jatinder Kumar, Hari Singh has reviewed on challenges in manufacturing of metal matrix composites by using stir casting method. The quality of components manufactured by casting can be improved by controlling various parameters of stir casting process which is stirring temperature, stirring speed, stirring time, preheating time, selection of matrix and reinforcements. [8] A. Kh. Valeeva, I. Sh. Valeev, and R.F. Fazlyakhmetov has studied the effect of conditions of crystallization in the course of the production of a bearing lining on the structure and wear of the B83 babbit. It is observed that the pressing of the melt being crystallized makes it possible to form a homogeneous structure with fine crystals of the cubic SnSb ISO 9001:2008 Certified Journal
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