Performance Assessment and Study of Tribological Properties of Self-lubricating Materials for Dry Lubrication

Author(s): 
P. N. L. Pavani†*, R. PolaRao†, C. L. V. R. S. V. Prasad†, & S. Srikiran‡

Affiliation(s): 

†Department of Mechanical Engineering, GMR Institute of Technology, Rajam, Andhra Pradesh, 
‡ Department of Mechanical Engineering, Lendi Institute of Engineering and Technology, Vizag-Viziangaram Road-NH-43, Denkada Mandal, Jonnada, Andhra Pradesh 535005, India
 
Cite this paper
P. N. L. Pavani, R. PolaRao, C. L. V. R. S. V. Prasad, S. Srikiran, “Performance Assessment and Study of Tribological Properties of Self-lubricating Materials for Dry Lubrication”, Journal of Mechanical Engineering Research and Developments, vol. 39, no. 3, pp. 670-680, 2016. DOI: 10.7508/jmerd.2016.03.008

ABSTRACT: Application of lubricant is a problem in many cases, apart from external lubrication; it is always being useful if the material itself has self-lubricating properties. Such kind of materials are GCI & PTFE+Graphite composites. In these, Graphite flakes acts as solid lubricant & when load is applied, these layers slide over another & provide lubrication. PTFE+Graphite is well known for its self-lubricating properties and widely employed in applications, where dry lubrication & good thermal stability are needed. Primary aim of this work is to study & compare tribological properties of proposed self-lubricating materials. Tests are conducted on the POD apparatus using GCI disc and pin & PTFE+Graphite pin & AISI 1045 Steel disc specimens under different conditions. Later, linear Regression models are developed using input and output variables for both GCI Pin on GCI disc and PTFE filled with Graphite Pin on AISI 1040 Steel disc. Validation of the proposed mathematical equation was done by comparing experimental and predicted values of the experimentation and in all cases percentage error was found in between 0-6%. ANOVA was also performed on the experimental results to assess the conformity of the suggested mathematical model with 99% confidence levels.

Keywords : Friction; Wear; POD; Gray cast iron; PTFE; COF.

References
[1] J. D. Bressan, D. P. Daros, A. Sokolowski, R. A. Mesuita, and C. A. Barbosa, “Influence of hardness on the wear resistance of 17-4 PH stainless steel evaluated by the pin-on-disk testing”, J Mater Process Technol, vol. 205, no. 1-3, pp. 353-359, 2008.
[2] D. L. Burris and W. G. Sawyer, “A low friction and ultra low wear rate PEEK/PTFE composite”, Wear, vol. 261, no. 3-4, pp. 410-418, 2006.
[3] W. Li, W. Shi, X. Jiang, J. Hu, X. Ye, and H. Tian, “Research on the liquid film force of water lubricated bearing in desalination multistage pumps and its coupled dynamics with rotor”, Journal of Coastal Research, vol. 73, pp. 453-458, 2015.
[4] M. Kawakame and J. D. Bressan, “Study of wear in self-lubricating composites for application in seals of electric motors”, j mater process technol, vol. 179, no. 1-3, pp.74-80, 2006.
[5] M. W. J. Lewis, Friction and wear of PTFE-based reciprocating seals. ASLErASME Lubrication Conference, San Diego, CA, October 22-24, 1984.
[6] L. Xin, J. He, H. Liu, and Y. Shen, “Potential of using cemented soil-tire chips mixture as construction fill: a laboratory study”, Journal of Coastal Research, vol. 73, pp. 564-571, 2015.
[7] M. W. J. Lewis, “Friction and wear in PTFE-based reciprocating seals”, Lubrication Engineers, vol. 42, no. 3, pp. 152, 1986.
[8] L. H. Lee, in: M. J. Comstock (Ed.), “Polymer Wear and its Control”, American Chemical Society, Washington, DC, 1985, pp. 27-39.
[9] D. L. Li, L. S. Wang, W. X. Peng, S. B. Ge, N. C. Li, and Y. Furuta, “Chemical structure of hemicellulosic polymers isolated from bamboo bio-composite during mold pressing”, Polymer Composites, 2015.
[10] J. Khedkar, I. Negulescu, and E. I. Meletis, “Sliding wear behavior of PTFE composites”, Wear, vol. 252, no. 5-6, pp. 361-369, 2002.
[11] H. Unal, A. Mimaroglu, U. Kadıoglu, and H. Ekiz, “Sliding friction and wear behaviour of Polytetrafluroethylene and its composites under dry conditions”, Materials and Design, vol. 25, no. 3, pp.239-245, 2004.
[12] D. Bagale, S. Shekhawat, and J. Chaudhari, “Wear analysis of polytetrafluoroethylene and its composites under dry conditions using design-expert”, International Journal of Scientific and Research Publications, vol. 3, no. 1, pp. 1-5, 2013.
[13] R. K. Goyal and M. Yadav, “Study on wear and friction behavior of graphite flake-filled PTFE composites”, j appl polym sci, vol. 127, no. 4, pp. 3186-3191, 2013.
[14] Minitab Technologies Inc.(2016) Mini Tab software version 17th user guide.