Abstract
In this study, we synthesized two types of calcium sulfonate complex greases (barium soap and calcium soap) and investigated their physical, rheological, and tribological properties in detail. The test results showed that the evolution of their linear viscoelasticity functions with frequency were quite similar to those of traditional lubricating greases. Moreover, these two calcium sulfonate complex greases had good friction-reducing and antiwear properties at room temperature and at 150 °C. In addition, by adding an organic molybdenum compound (MoDTC) to the base greases, we obtained a very low friction coefficient (0.065) for one of the greases (calcium soap) at 400 N and 500 N (maximum Hertzian pressures of 3.47 GPa and 3.74 GPa, respectively) at 150 °C. X-ray photoelectron spectroscopy (XPS) analysis showed that the tribofilm was composed of some complex oxide species and CaCO3 that had formed on the worn surface.
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Yanqiu XIA. He received his Ph.D. degree in mechanical design and theory from Northeast University in China, in 1999. He continued his postdoctoral study at the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences and National Institute of Advanced Industrial Science and Technology (AIST) at Tsukuba, Japan, in 2002 and 2007 respectively. In 2005, he was offered a titled professorship, Hundreds Talent Program of Chinese Academy of Sciences. Currently he has moved to School of Energy Power and Mechanical Engineering, North China Electric Power University at Beijing. His research areas cover the lubricants, grease, additives, lubrication for power equipment, equipment fault diagnosis etc.
Zeyun WANG. She received her Ph.D. degree in physical chemistry in 2012 from the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Now she is a lecturer at Ningxia University. Her research interests include lubricating grease and additives.
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Wang, Z., Xia, Y. & Liu, Z. The rheological and tribological properties of calcium sulfonate complex greases. Friction 3, 28–35 (2015). https://doi.org/10.1007/s40544-014-0063-1
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DOI: https://doi.org/10.1007/s40544-014-0063-1