Study of Tribological Properties of Nanolamellar WS₂ and MoS₂ as Additives to Lubricants

Abstract

This work was aimed at studying the tribological properties of nanolamellar tungsten and molybdenum disulfides produced from nanosized W and Mo nanopowders by self-propagating high-temperature synthesis. The prepared WS2and MoS2powders were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential thermal analysis (DTA). For tribological tests, oil-based lubricants added with nanolamellar tungsten and molybdenum disulfides were prepared. The tribological tests show that the friction coefficient of the nanolamellar powders is lower than that of commercial powder(μmin=0.024and 0.064, resp.). It is also found that the oil-based lubricants with nanolamellar disulfide additives display higher antifriction and antiwear properties compared to commercial powder.

Tribology Properties of Synthesized Multiscale Lamellar WS2 and Their Synergistic Effect with Anti-Wear Agent ZDDP

“…In recent years, the preparation methods of MoS 2 /WS 2 nanoparticles have been extensively studied. The researchers have successfully prepared MoS 2 /WS 2 nanoparticles through various synthetic methods and discussed their tribological properties under different experimental environments [5][6][7]. Among them, inorganic fullerene-like (IF) MoS 2 /WS 2 nanoparticles seem to be the most widely explored ones, probably because of their low surface energy, fine chemical stability, and spherical shape, which allow them to play an active role in a variety of tribological applications [8][9][10].…”

The Role of Solid Lubricants for Brake Friction Materials

“…The objective of using oil additives is to keep the ultra-low COF even under mixed lubrication conditions when asperities of the counter-bodies come into direct contact with each other [2]. This usually is achieved by crystallographically aligned solid lubricant films of either graphite [5][6][7] or MoS 2 and WS 2 [8][9][10][11][12], or by amorphous films which can flow in a fluid-like manner [13,14].…”

An Investigation on Tribological Properties and Lubrication Mechanism of Graphite Nanoparticles as Vegetable Based Oil Additive

“…Hwang et al [14] studied the tribological behaviors of graphite nanoparticles as mineral oil additive using a disc-on-disc tribotester and found that the improvement in friction-reducing and antiwear properties of pure oil was attributed to the presence of spherical nanoparticles, which prevented direct contact between frictional surfaces. An et al [15] produced nanolamellar tungsten and molybdenum Table 1: Properties of graphite nanoparticles.…”