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Research Article | Open Access

The rheological and tribological properties of calcium sulfonate complex greases

Zeyun WANG1,2, Yanqiu XIA3(), Zhilu LIU2
School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 210094, China
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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.

Keywords

calcium sulfonate complex greases; tribological properties; rheology; viscoelasticity

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Friction
Volume 3 Issue 1,
March 2015
Pages 28-35
DOI: 10.1007/s40544-014-0063-1
Cite this article:
WANG Z, XIA Y, LIU Z. The rheological and tribological properties of calcium sulfonate complex greases. Friction, 2015, 3(1): 28-35. https://doi.org/10.1007/s40544-014-0063-1
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