SLIDING WEAR STUDIES OF PUMP LINER MATERIAL (GCI 26) BY POD TRIBOMETER
Keywords:
Rotary piston vacuum pump, liner, GCI 26, Sliding wear test, POD tribometerAbstract
Rotary piston vacuum pumps are used in NFC, Hyderabad in large numbers to create vacuum in various systems and furnaces. Due to continuous operation, the liner component of the pumps got worn out resulting in failure in achieving the required vacuum. Efforts were made to repair and refurbish of the pumps by the manufacturer. By metallography, the liner material was found that pump material was gray cast iron (GCI 26). An extensive pin-on-disc experiment was carried out for three loads namely 0.5, 1 and 2 kg for a sliding distance of 1000 m. Two set of sliding velocities 2 and 3 m/s were chosen. GCI 26 showed high friction and wear under dry conditions. It is observed that as the speed increases the coefficient of friction also increases. Use of the vacuum pump for prolonged duration promoted wear leading to deterioration of clearance between the rotary cam and the liner, there by degrading vacuum in the corresponding chamber.
Downloads
References
Donald H and Buckley (1977), “Effect of carbon content on friction and wear of cast irons,” NASA Technical paper, Vol. 1052, 1-20.
Kawamoto M and Okabayashi K (1979), “Study of dry sliding wear of cast iron as a function of surface temperature,” Wear, Vol. 58, 59-95.
Tomlinson W J and Vandrill G J (1987), “Dry sliding wear of grey cast iron containing 0.2-1.0 wt.% P,” Wear, Vol.117, 375-379.
Hakan Kaleli Terry Eyre and Farshad Ghasripoor (1997), “Effect of lubricant additives on the transition pressure from mild to severe wear for grey cast iron sliding pairs,” Wear, Vol. 208, 1-10.
Prasad B K (2006), “Sliding wear response of a cast iron under varying test environments and traversal speed and pressure conditions,” Wear, Vol.260, 1333-1341.
Prasad B K (2007), “Sliding wear response of cast iron as influenced by microstructural features and test condition,” Mater. Sci. Eng. A, Vol.456, 373-385.
Hirasata K Hayashi K and Inamoto Y (2007), “Friction and wear of several kinds of cast irons under severe sliding conditions,” Wear, Vol.263, 790-800.
Prasad B K (2010), “Lubricated sliding wear behavior of a cast iron: Effect of graphite and/or talc Fraction in oil,” J. Mater.Eng. Perform, Vol.19(3), 413-420.
Prasad B K (2011), “Sliding wear response of a grey cast iron: Effect of some experimental parameters,” Tribol. Int., Vol 22,660-667.
Agunsoye J O OChulor E F Talabi S I and Olatunji S (2012), “Effect of Manganese Additions and wear parameter on the tribological behaviour of NFGrey (8) Cast iron,” Tribol. Ind., Vol.34 (a), 239-246.
Ashutosh Pratap Sing, “Kinematic and Dynamic Analysis of ULVAC PKS-70 Pump”, Unpublished work, IGCAR.
ASTM Designation: G99-05 (Reapproved 2010) standard method for wear testing with pin on disk apparatus.
Utpal Borah, “Stress Analysis of ULVAC PKS-70 Pump”, Unpublished work, IGCAR.
