LUBRICATING EFFECT OF SULFUR-AND PHOSPHORUS-FREE ORGANIC MOLYBDENUM ON DIFFERENT MATRIX MATERIALS

Abstract

Abstract: Different amounts of sulfur- and phosphorus-free organic molybdenum (SPFOM) additive were added into diesel engine oil to measure the friction reduction and anti-wear properties of SPFOM on No.45 steel and GCr15 steel using SRV friction wear machine. Scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were employed to analyze the worn surface morphologies, elements with various valences. The test results show that the friction reduction property of SPFOM on No. 45 steel is improved with increasing additive amount, but the anti-wear property declines, and the wear volume is even larger than that of diesel engine oil without SPFOM when the additive amount is above 0.6%; the lubricating effect of SPFOM is much better on GCr15 steel than that on No. 45 steel, and both friction coefficient and wear volume decrease with the increasing of additive amount. Boundary lubricating film containing molybdenum and ferrous oxide is formed on the matrix surface during friction process with SPFOM in the oils, but too much SPFOM forms MoO3 particles, which increase wear volume of No. 45 steel, serious oxidation of the matrix surface, and wear trend. While the hardness of GCr15 steel is high enough to avoid the increase of wear volume, resulting in effective anti-wear for lubricating oil with SPFOM.

Key words: sulfur- and phosphorus-free organic Mo, matrix material, friction-reduction, anti-wear

CLC Number:

References

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