Journal
TRIBOLOGY INTERNATIONAL
Volume 42, Issue 7, Pages 1029-1039Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2009.02.012
Keywords
Calcium carbonate; Nanoparticles; Lubrication additives; PAO; Tribology
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Funding
- China National 973 Program [2007CB607606]
- Program of the Light in China's Western Region
- Nature Science Foundation of Gansu [3YS051-A25-003]
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This paper reports the tribological behavior of CaCO3 nanoparticles as a green additive in poly-alphaolefin (PAO) base oil under variable applied load, sliding speed, sliding duration, and temperature. The tribological properties and the electrical contact resistance between the tribo-pairs lubricated with PAO alone, and PAO containing CaCO3 nanoparticles, were determined using an Optimol-SRV 4 oscillating friction and wear tester (SRV). The morphology and wear volume of the worn scar were measured simultaneously using a surface profilometer. The results showed that CaCO3 nanciparticles can dramatically improve the load-carrying capacity, as well as the anti-wear and friction-reduction properties of a PAO base oil. In addition, higher applied load, moderate frequency, longer duration time, and lower temperatures are beneficial to the deposition of CaCO3 nanoparticles accumulating on rubbing surfaces. X-ray photoelectron spectroscopy (XPS) reveals a boundary film composed Of CaCO3, CaO, iron oxide, and some organic compounds on the worn surfaces. (C) 2009 Elsevier Ltd. All rights reserved.
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