In this study, we evaluated the tribological properties of grey cast iron (GC200) surfaces with and without MoS2 coating that were lubricated with either mineral oil or mineral oil in which fullerene nanoparticles were dispersed (i.e., nano-oil), by using a disk-on-disk type tribotester. A series of friction tests were performed using the disk-on-disk type tribotester under various normal forces, and the friction coefficient and friction surface temperature were monitored simultaneously. First, we observed that the friction coefficient of the GC200 surface that has a MoS2 coating and is lubricated with mineral oil was 32% lower than that of the GC200 surface without a MoS2 coating. Second, we found that the friction coefficient of GC200 surfaces lubricated with nano-oil was approximately 74% lower than that of GC200 surfaces lubricated with mineral oil. This suggested that the effectiveness of nano-oil lubrication in reducing the friction between GC200 surfaces is considerably higher than that of MoS2 coating or mineral-oil lubrication. In order to examine the effects of both the coating and nano-oil lubrication, friction tests for MoS2-coated GC200 surfaces under nano-oil lubrication was performed. We observed the following: (i) the friction coefficient of MoS2-coated GC200 surfaces lubricated with nano-oil were approximately 82% lower than that of uncoated GC200 surfaces lubricated with mineral oil; (ii) the nano-oil lubrication even tended to prevent the coating from peeling off, presumably because the fullerene nanoparticles added in the mineral oil acted as ball bearings. These observations suggested that the presence of a coating on friction surfaces and the addition of nanoparticles in mineral oil lubricant have a synergistic effect in significantly reducing the friction between friction surfaces.
Effects of atomic oxygen (AO) irradiation on the structural and tribological behaviors of glass fiber (GF) and MoS2 filled polytetrafluoroethylene (PTFE) composites were investigated in a ground-based simulation facility, in which the average energy of AO was about 5 eV and the flux was 5.0 Ã...
The effect of friction-reducing and antiwear of lubricant additives on T8 steel/Al2O3 ceramics was investigated using a pin-on-disk tribometer at a room temperature. Diisopropyl phosphite (T451) and Triphenyl thiophosphate (T309 or TPPT) with various mass concentrations were blended in 500SN base...
In this paper, the effect of short carbon fiber (SCF), graphite (Gr) and nano-Si3N4 on the friction and wear behavior of polyimide (PI) composites were studied using a block-on-ring arrangement. Experimental results revealed that single incorporation of SCF and Gr can improve the friction-reducin...
Tribological and thermal behavior of both micrometer-sized ceramic fiber and nanometer-sized potassium titanate whisker (PTV) reinforced automotive brake linings were investigated. Friction stability and wear rate were measured by the CHASE test. Morphology and thermal stability were examined by ...
A MoS3 precursor deposited on anatase nano-TiO2 is heated at 450 °C in an H2 atmosphere to synthesize MoS2/TiO2 nano-clusters. The nano-clusters are then characterized, and their tribological properties are evaluated. MoS2 is found to be composed of layered structures with 1–10 nm thicknesses,...
The nitrided layer on 35CrMo steel was prepared by ion nitriding process, and then the sulfur–nitrided layer was obtained by low temperature ion sulfuration. The results showed that both the nitrided and sulfur-nitrided surfaces improved the wear resistance efficiently under PAO lubrication, an...
Articular cartilage is a highly efficacious water-based tribological system that is optimized to provide low friction and wear protection at both low and high loads (pressures) and sliding velocities that must last over a lifetime. Although many different lubrication mechanisms have been proposed...
Synergistic effect of carbon black (CB) in presence of nanofillers (nanoclay and nanofiber) on mechanical and dynamic mechanical properties was discussed in light of electrostatic interactions and the concomitant microstructural developments, in Part I of this series. These interactions enhanced ...
submitted by incltroflooxac 2 years and 4 months ago
A modified nano-calcium carbonate (R-CCR) was prepared by coating a layer of unsaturated hydroxylfatty acid on the surface of CCR powders using a solid state method; the latter were commercial nano-CaCO3 modified with stearic acid. FTIR studies indicate that the modifier is combined on the surfac...
The aim of this work is the study the tribological behaviour and tribocorrosion resistance of newly developed multilayer PVD coatings Cr/CrN and CrN/ZrCN applied on nitrided F1272 steel for gear applications. – Tribological characterization has been completed by several tribological tests perfor...
