Tribological Properties of Nanolamellar MoS2Doped with Copper Nanoparticles

Vladimir An,Yuri Irtegov

doi:10.1155/2014/731073

Abstract

This study aimed at examining the tribological properties of nanolamellar molybdenum disulfide doped with copper nanoparticles. Nanolamellar molybdenum disulfide was produced using self-propagating high-temperature synthesis via the reaction between elementary sulfur and nanosized molybdenum powder prepared by electrical explosion of wires. Copper nanoparticles were also prepared by electrical explosion of copper wires. Comparative tribological tests were carried out for nanolamellar and commercial molybdenum disulfides doped with 7 wt.% of copper nanoparticles. It was demonstrated that doping copper nanoparticles additives reduce wear of the friction body when using both commercial and nanolamellar molybdenum disulfide.

Highlights

A large amount of research has been devoted to the study of tribological properties of lamellar transition metal dichalcogenides (TMDC) like molybdenum disulfide (MoS2)
This paper focuses on the study of tribological properties of nanolamellar molybdenum disulfide doped with copper nanoparticles
A comparative study of tribological properties of commercial and nanolamellar MoS2 doped with copper nanoparticles prepared by electrical explosion of wires was performed

Summary

Introduction

A large amount of research has been devoted to the study of tribological properties of lamellar transition metal dichalcogenides (TMDC) like molybdenum disulfide (MoS2). Remarkable antifriction and antiwear properties of molybdenum disulfide in an inert atmosphere or vacuum are explained by its lamellar structure resulting in low shear strength. Martin et al [1] speculated about superlubricity of molybdenum disulfide. Pure MoS2 is supposed to satisfy the condition of superlubricity taking into account frictional anisotropy of the shear oriented low energy basal planes. Jamison and Cosgrove [2] correlated the lowest friction coefficient to the axial ratio c0/na0 which might not exceed 1.87, whereas it is equal to 1.95 for 2H-MoS2. Molybdenum disulfide is used as a solid lubricant [3], a tribological coating [4], or an additive to lubricants [5]

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Conclusion