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Tribological Performance (tribological + performance)
Selected AbstractsTribological performances of heterocyclic-containing ether and/or thioether as additives in the synthetic diesterLUBRICATION SCIENCE, Issue 3 2009Peipei Liang Abstract The load-carrying capacity, wear and friction properties of 2-octoxyl methylthio-benzothiazole (DEOY) and 2-dodecylthio methylthio-benzothiazole (DEMB) added to a synthetic lubricant (diester) were evaluated using a four-ball test machine. The results indicate that the two compounds added to the diester possess good load-carrying capacities and excellent anti-wear and friction reduction properties. The thermal stability of the two compounds under nitrogen atmosphere was investigated by thermogravimetric analysis (TGA). It was found that the compounds DEOY and DEMB possess excellent thermal stability. The surface topography of the rubbed surface was investigated with scanning electron microscopy, the elemental chemical nature of the anti-wear films generated on steel counterface were investigated with X-ray photoelectron spectroscopy. Copyright © 2009 John Wiley & Sons, Ltd. [source] Influence of fatty acid additives on the tribological performance of sunflower oilLUBRICATION SCIENCE, Issue 9 2010Patrick Baumgart Abstract Vegetable oils are potential substitutes for petroleum-based lubricants because they are environmentally friendly, renewable, less toxic and readily biodegradable. The addition of free fatty acids has been shown to increase the lubrication performance of vegetable oils at elevated temperatures. The purpose of this study was to evaluate the relationship between the length of the carbon chain in the fatty acid and its effectiveness as an additive for a range of elevated temperatures. Stearic, arachidic and behenic fatty acid additives were added to commercial sunflower oil. All fatty acid additives were shown to be effective in lowering the wear rate and coefficient of friction in ball-on-disc tribological tests. The overall carbon chain length was not observed to have a consistent influence on the effectiveness of the additive. All additives were less effective at temperatures above 100°C. Copyright © 2010 John Wiley & Sons, Ltd. [source] Initial exploration of tribological performance of novel triazine derivatives in waterLUBRICATION SCIENCE, Issue 4 2009Liping Sheng Abstract Two novel ashless and non-phosphorus triazine derivatives, 2,4,6-tri-[N-hydroxyethyl-amino-methylenesulfanyl]-s-triazine and 2,4,6-tri-[N,N-bishydroxyethyl-amino-methylenesulfanyl]-s-triazine, were synthesised and their structures were analysed through elemental analysis. Their tribological behaviours in water were evaluated with a four-ball machine, and the results indicate that their wear resistance and load-carrying properties were excellent. The chemical features of the worn steel surface were observed and examined by means of inverted metallurgical microscopy and energy dispersive X-ray spectroscopy. The analytical results of typical elements on the worn steel surface demonstrated, during the lubricating process, that the additives reacted with counter-face metal and generated a boundary lubricating and protecting film containing elements of S, N and others, which contributes to improve the tribological properties of the test fluid. Copyright © 2009 John Wiley & Sons, Ltd. [source] Tribological behaviour of polymeric coatings.LUBRICATION SCIENCE, Issue 4 2005Part I. Aramid particle-reinforced epoxy nanocomposite systems Abstract An epoxy-based nanocomposite containing a low concentration of nanometric TiO2 (4 vol. %), graphite powder (7.21 vol. %), and 2,14 vol. % aramid particles was developed as a coating material. The mechanical and tribological performance of the composites was investigated. The epoxy filled only with TiO2 possessed significantly improved impact strength and flexural properties, whereas the further incorporation of graphite and aramid particles had a deleterious effect on most of the mechanical properties, except the modulus. The tribological behaviour of the composites was tested in sliding and fretting modes. Under sliding conditions, the addition of nanometric TiO2 alone significantly improved the wear resistance and decreased the coefficient of friction compared to the neat epoxy. The sliding wear and friction behaviour was further enhanced with the incorporation of graphite and aramid particles. Contrary to the sliding wear behaviour, the fretting wear and friction behaviour was worse for the epoxy filled only with TiO2, but was significantly enhanced by the incorporation of graphite and aramid particles. The optimum aramid particle content for sliding and fretting wear of the epoxy-based nanocomposite was determined as 10 vol. %. [source] A study of the synergistic effect of a triazine-dithiocarbamate derivative with tcp in vegetable oilLUBRICATION SCIENCE, Issue 4 2005Z. Y. He Abstract A novel, potential ashless S,N-style additive, 2-(N,N-dibutylamino)-4,6-bis-(dibutyldithiocarbamate)-1,3,5-triazine (DBTT), was synthesised and its synergistic tribological effect with a traditional additive, tricresyl phosphate (TCP), in rape seed oil was evaluated using a four-ball tester. The results show that the load-carrying capacity of the vegetable oil could be improved greatly by the presence of the TCP and/or DBTT additives; at certain mass ratios TCP and DBTT show a good synergistic effect in improving the tribological performance of the base oil. The elemental composition and chemical nature of antiwear films generated at a steel interface were investigated using Kevex energy dispersive X-ray analysis and X-ray photoelectron spectroscopy. Scanning electron microscopy was also used to study the rubbed surface morphology. It was found that FeS, organosulphur compound, sulphate, phosphate, and nitrogen-containing compounds were present in the complex boundary lubrication film. [source] Mechanical and tribological behaviors of PA66/PVDF blends filled with calcium sulphate whiskersPOLYMER COMPOSITES, Issue 9 2009Hong-Gang Wang The mechanical and tribological performance of the PA66/PVDF blends filled with various amount of calcium sulphate whiskers (CSW) was investigated. The whiskers improve the tensile and flexural performance of the PA66/PVDF blends. Meanwhile, the addition of CSW obviously decreases friction coefficient and improves the wear resistance of the blends. With the further increase of CSW, friction coefficient of the blends relatively keeps stable and the wear resistance of the blends slightly decreases. The PA66/PVDF blends filled with 5 wt% CSW exhibited the best anti-wear ability. FTIR analysis shows that the chemical change has not occurred in the debris. XPS analysis shows that some tribo-chemical reactions have occurred during friction process and produces some compounds such as FeF2, Fe2O3 on the transfer film surfaces. POLYM. COMPOS., 2009. © 2009 Society of Plastics Engineers [source] Preparation and Tribological Properties of MoS2 Nanosheets,ADVANCED ENGINEERING MATERIALS, Issue 6 2010Zhuangzhi Wu MoS2 nanosheets were successfully synthesized by a micro-domain reaction method, employing a ball-milled mixture of MoO3 and S as starting materials. The obtained MoS2 nanosheets are monodisperse, and the length and width are about 100 and 10,nm, respectively. Furthermore, the tribological performances of the as-obtained MoS2 nanosheets were studied and possible optimized mechanisms were also proposed. [source] | ||||||||||