Abstract
MoS2-multi-walled-carbon-nanotube (MWCNT) hybrids containing two-dimensional MoS2 and one-dimensional MWCNTs were synthesized through a one-step hydrothermal reaction. X-ray-diffraction and transmission-electron-microscopy results demonstrated that MoS2 nanosheets were successfully synthesized, and uniformly anchored on the MWCNTs’ surfaces. Furthermore, the effects of the MoS2-MWCNT hybrids on the tribological performances of polyurethane composite coatings were investigated using a UMT-2MT tribo-tester. Friction and wear test results revealed that the friction coefficient and wear rate of a 3 wt% MoS2-MWCNT-1 filled polyurethane composite coating were reduced by 25.6% and 65.5%, respectively. The outstanding tribological performance of the MoS2-MWCNT-1 reinforced polyurethane composite coating was attributed to the excellent load-carrying capacity of the MWCNTs and good lubricant ability of MoS2. The surface morphologies of the worn surfaces and counterpart ball surfaces were investigated to reveal the wear mechanisms.
Highlights
In recent years, polymer matrix composites have emerged as attractive materials in the industrial community
The friction coefficient of the 3 wt% MoS2-MWCNT-1 reinforced polyurethane composite coating was reduced by 25.6%
The MoS2-MWCNT-1 reinforced polyurethane composite coating exhibited a lower and more stable friction coefficient than that of the pristine polyurethane composite coating during the sliding process. These results indicate that the MoS2-MWCNT-1 hybrid as a lubricant filler has a significant influence on the tribological performance of the polyurethane composite coating
Summary
Polymer matrix composites have emerged as attractive materials in the industrial community. Thermoplastic polyurethane composites have attracted a significant attention owing to their outstanding chemical resistance, toughness, adhesive and anti-wear properties [5−7]. Polyurethane exhibits these properties, there are challenges associated to friction and wear performance [8]. Two-dimensional (2D) nano-materials have attracted a significant attention owing to their unique lamellar structure and superior lubricant properties [16−23]. The results revealed that all fullerene-like MoS2 can effectively reduce the friction coefficient and wear volume. Hu et al [22] have synthesized
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