The tribological properties of liquid paraffin (LP) containing molybdenum disulfide (MoS 2 ) additives, including nano-balls, nano-slices, and bulk 2H-MoS 2 , are evaluated using a four-ball tribometer. Results show that all MoS 2 additives used can improve the tribological properties of LP, and that nanosized MoS 2 particles function as lubrication additives in LP better than micro-MoS 2 particles do. The LP with nano-balls presents the best antifriction and antiwear properties at the MoS 2 content of 1.5 wt%. This is ascribed to the chemical stability of the layerclosed spherical structure of nano-balls. The Stribeck curves confirm that the rotation speed of 1,450 rpm used is located at the mixed lubrication region under 300 N. MoS 2 nano-slices have small sizes and easily enter into the interface of the friction pair with a roughness of 0.032 lm, functioning as a lubricant in LP better than nano-balls do at the MoS 2 content of 1.0 wt%. The Stribeck curves also show that the differences between the two nano samples were magnified at high rotation speeds in hydrodynamic lubrication region. The application of nano-slices in high sliding speeds will be more advantageous. This work furthers the understanding of the relationship between the tribological properties and morphology of MoS 2 .
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