Publisher : Korean Society of Precision Engineering
DOI : 10.7736/KSPE.2016.33.1.37
Title & Authors
Effect of Water Content on Tribological Characteristics of Grease Wang, Do-Young; Yoo, Shin-Sung; Kim, Seong-Soo; Kim, Dae-Eun;
Friction of mechanical components affects the life and reliability of various machines. In order to improve the wear resistance of mechanical components, grease has been used as a lubricant. However, depending on the operating condition of the machine, the grease may be contaminated with water, which lowers the its lubricating ability. In this work, the effect of the water content on the lubricating ability of grease was investigated. Friction tests using grease were performed between a stainless steel ball and an acrylic plate. Water content in the grease was varied (0, 5, 10 wt.%). It was found that the contact angle varied due to the addition of water in the grease. The friction and wear of the specimens were assessed with respect to amount of water content. Wear of the specimens was relatively severe when water was added. A water content of 10 wt.% resulted in significant lubricant degradation.
Grease lubrication;Water content;Friction;Wear;
Kim, H. J. and Kim, D. E., "Nano-Scale Friction: A Review," Int. J. Precis. Eng. Manuf., Vol. 10, No. 2, pp. 141-151, 2009.
Kim, H. J., Yoo, S. S., and Kim, D. E., "Nano-Scale Wear: A Review," Int. J. Precis. Eng. Manuf., Vol. 13, No. 9, pp. 1709-1718, 2012.
Penkov, O., Kim, H. J., Kim, H. J., and Kim, D. E., "Tribology of Graphene: A Review," Int. J. Precis. Eng. Manuf., Vol. 15, No. 3, pp. 577-585, 2014.
Yoo, S. S. and Kim, D. E., "Minimum Lubrication Technique Using Silicone Oil for Friction Reduction of Stainless Steel," Int. J. Precis. Eng. Manuf., Vol. 14, No. 6, pp. 875-880, 2013.
Moon, J. H., Lee, H. D., and Kim, S. I., "Lubrication Characteristics Analysis of an Air-Oil Lubrication System Using an Experimental Design Method," Int. J. Precis. Eng. Manuf., Vol. 14, No. 2, pp. 289-297, 2013.
Yoo, S. S. and Kim, D. E., "Vapor Phase Lubrication Using High Molecular Weight Lubricant for Friction Reduction of Metals," Int. J. Precis. Eng. Manuf., Vol. 15, No. 5, pp. 867-573, 2014.
Azevedo, N. G., Farias, J. S., Bastos, R. P., Teixeira, P., Davim, J. P., et al., "Lubrication Aspects during Single Point Incremental Forming for Steel and Aluminum Materials," Int. J. Precis. Eng. Manuf., Vol. 16, No. 3, pp. 589-595, 2015.
Lundberg, J. and Hoglund, E., "A New Method for Determining the Mechanical Stability of Lubricating Greases," Tribology International, Vol. 33, No. 3, pp. 217-223, 2000.
Komatsuzaki, S., Uematsu, T., and Kobayashi, Y., "Change of Grease Characteristics To the End of Lubricating Life," NLGI Spokesman, Vol. 63, No. 12, pp. 22-29, 2000.
Cann, P., Doner, J., Webster, M., and Wikstrom, V., "Grease Degradation in Rolling Element Bearings," Tribology Transactions, Vol. 44, No. 3, pp. 399-404, 2001.
Cann, P. M., "Grease Degradation in a Bearing Simulation Device," Tribology International, Vol. 39, No. 12, pp. 1698-1706, 2006.
Kim, T. J., "EHL Analysis of the Ball Joint Contact in a Reciprocating Compressor," Journal of the Korean Society of Tribology and Lubrication Engineers, Vol. 19, No. 2, pp. 85-93, 2003.
Hurley, S., Cann, P. M., and Spikes, H. A., "Lubrication and Reflow Properties of Thermally Aged Greases," Tribology Transactions, Vol. 43, No. 2, pp. 221-228, 2000.
Mota, V. and Ferreria, L. A., "Influence of Grease Composition on Rolling Contact Wear: Experimental Study," Tribology International, Vol. 42, No. 4, pp. 569-574, 2009.
Lee, C. H., Choi, J. Y., Cho, W. O., Jeon, I. S., and Yun, H. C., "Grease Degradation Analysis in Driveshaft Joints," Proc. of the KSTLE Spring Conference, pp. 121-122, 2010.
Lim, Y. K., Lee, E. H., Lee, J. M., and Jeong, C. S., "Performance of Automative Wheel Bearing Grease by Water Contents," Journal of the Korean Society of Tribology and Lubrication Engineers, Vol. 27, No. 5, pp. 275-280, 2011.
Lim, Y. K., Ham, S. Y., Lee, J. M., and Jeong, C. S., "Decomposition of Thickener in Grease by Water Contamination," Journal of the Korean Society of Tribology and Lubrication Engineers, Vol. 28, No. 1, pp. 33-37, 2012.