“…38 The development of oxidised protective layers on the worn surfaces of the materials in contact results in decrease in friction severity. 39 The decrease in wear severity is aided by the change in physical structure of the polymer in engine oil 0W20 and 5W30 as the temperature of the oil rises. Engine oil additives are activated at higher temperatures.…”
In this study, SAE-0W20 engine oil was mixed with graphene and fullerene nanoparticles. The goal of this study was to evaluate and compare the effects of different carbon nanoparticles on the thermal, rheological, and tribological properties of engine oil, such as thermal degradation, viscosity, friction, and wear. Using a two-step process, graphene and fullerene nanostructures were dispersed in low-viscosity SAE-0W20 engine oil at a concentration of 0.05 wt.%. The friction and wear characteristics were evaluated in a customized cylindrical block-on-ring tribology test according to the ASTM G77 standard. Graphene and fullerene nanoparticles protect contact surfaces by forming a very thin protective film between moving mechanical parts thus resulting in wear and friction reduction. The results showed graphene nanoparticles have improved significantly the tribological performance of SAE-0W20 engine oil.
“…38 The development of oxidised protective layers on the worn surfaces of the materials in contact results in decrease in friction severity. 39 The decrease in wear severity is aided by the change in physical structure of the polymer in engine oil 0W20 and 5W30 as the temperature of the oil rises. Engine oil additives are activated at higher temperatures.…”
In this study, SAE-0W20 engine oil was mixed with graphene and fullerene nanoparticles. The goal of this study was to evaluate and compare the effects of different carbon nanoparticles on the thermal, rheological, and tribological properties of engine oil, such as thermal degradation, viscosity, friction, and wear. Using a two-step process, graphene and fullerene nanostructures were dispersed in low-viscosity SAE-0W20 engine oil at a concentration of 0.05 wt.%. The friction and wear characteristics were evaluated in a customized cylindrical block-on-ring tribology test according to the ASTM G77 standard. Graphene and fullerene nanoparticles protect contact surfaces by forming a very thin protective film between moving mechanical parts thus resulting in wear and friction reduction. The results showed graphene nanoparticles have improved significantly the tribological performance of SAE-0W20 engine oil.
“…The Cr peak observed in debris analysis confirms the oxidation and removal of materials from the counterbody (Figure 18). Surface hardness of worn region increased with load and sliding speed due to strain hardening, resulting in less wear on sample surface and more wear on counterbody surface, leading to transfer and adhesion of Cr from ball to sample surface [22,54,55]. Figure 18 EDS analysis of debris obtained from ADI sample at 0.79 m/s – 100 N.…”
In this study, dry sliding wear behaviour of a copper alloyed austempered ductile iron (ADI) consisting of very fine ausferrite, small high carbon austenite blocks, was investigated against 100Cr6 ball using ball-on-disc tribometer. Tribotests were conducted at different loads of 10, 30, 50, and 100 N and speeds between 0.39 to 0.79 m/s. Worn-out surfaces and wear debris revealed tribe-oxidation and abrasive wear as the primary mechanism for material removal at lower loads and low speed (0.39 m/s). With an increase in load and speed, fragmented graphite nodules acted as solid lubricants. Additionally, partial transfer of tribo-oxide onto the counter-body ball, and plastic deformation and strain hardening of ADI matrix lowered the friction coefficient and wear rate at higher loads and speed, to nearly 1/ 3 and 1/10 as compared with those at lower loads and speed. The superior wear resistance of present ADI is worthy of consideration for transmission parts.
“…in the semiconductor industry 1–5 . The growing interest in SiC ceramics is attributed to their excellent mechanical properties, tunable electrical and thermal properties, high irradiation tolerance, high oxidation and corrosion resistance, and excellent wear resistance 6–11 …”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5] The growing interest in SiC ceramics is attributed to their excellent mechanical properties, tunable electrical and thermal properties, high irradiation tolerance, high oxidation and corrosion resistance, and excellent wear resistance. [6][7][8][9][10][11] Owing to the high brittleness of SiC ceramics, complex SiC hardware cannot be fabricated by conventional processing techniques such as hot forging, extrusion, etc.…”
Liquid phase sintered SiC ceramics were joined using magnesia‐alumina‐silica (MAS) glass‐ceramic fillers without applied pressure. Four different filler compositions with 9.3–25.2 wt.% MgO, 20.7–33.6 wt.% Al2O3, and 49.2–68.1 wt.% SiO2 were studied. The effects of filler composition and joining temperature (1450–1600°C) on the joint strength were investigated. All compositions exhibited an optimum joining temperature at which the maximum joint strength was obtained. A low joining temperature resulted in poor wetting of the SiC substrate due to the high viscosity of the filler. Whereas a high joining temperature caused dewetting and large unfilled sections in the interlayer due to the deleterious interfacial reactions. The joint strength was inversely proportional to the interlayer thickness, which was a function of filler composition and joining temperature. The SiC ceramic joined at 1525°C with MgO‐25 wt.% Al2O3‐60 wt.% SiO2 filler exhibited a four‐point bending strength of 286 ± 40 MPa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
