Experimental Investigation of MoS2 Micro-Particles as Additive for Bearing Oils
The anti-friction bearings in present day applications are exposed to severe operating conditions comprising of heavy loads and higher speeds. Under these conditions the lubricants with better anti-friction, anti-wear and extreme-pressure (EP) properties are highly desired. Molybdenum di sulphide (MoS2) has been in use as solid lubricant in industrial and automotive applications. The lamellar structure of MoS2 aid in reducing friction and wear between the contacting surfaces. When blended in liquid lubricants as additive, MoS2 can enhance their tribological performance. However, its use in liquid lubricants has been hindered due to the poor dispersion stability of macro size particles. The dispersion stability can be enhanced by reducing the particle size and by chemical functionalization of the particles. The present work reports the route for functionalization of MoS2 micro-sized particles for stable dispersion in mineral based lubricating oil and the tribo-performance investigations carried out on the blends with different concentrations of MoS2 particles. The MoS2 micro-particles have been functionalized by selective inclusion of long alkyl chains on the particle surface by TrichloroOctadecylsilane through sulphur and silane linkages. The functionalized MoS2 micro-particles have been characterized by analytical techniques like FTIR, XRD, TGA, SEM, and EDX. The functionalized MoS2 micro-particles were blended in mineral base oil in varying concentrations and tested for their tribological performance in a four-ball wear and EP tester. The experimental studies performed have reported a significant reduction in friction and wear to the order of 41% and 7% respectively for the mineral oils blended with functionalized MoS2 micro-particles. Further, the weld load representing the EP property has been enhanced by 43% with the addition of functionalized MoS2 micro-particles. Thus, from the present study it is concluded that the functionalized MoS2 micro-particles can be used as additives for bearing oil for enhanced tribological performance.
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Document Type: Research Article
Affiliations: Advanced Tribology Research Centre, CSIR-Indian Institute of Petroleum, Dehradun 248005, India
Publication date: November 1, 2016
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