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Lubricant anti-wear additives are known to chemically interact with metallic surfaces to form a self-healing, wear-protection tribofilm. Their interactions with non-metallic surfaces are however less understood. Here we report recent findings on whether and how a zinc dialkyldithiophosphate (ZDDP) and a phosphonium–organophosphate ionic liquid (IL) form tribofilms on three hard coatings, AlMgB14–TiB...
Tribological evaluations were conducted on lubricating base oils of different viscosity grades with and without an anti-wear (AW) additive in lubricating steel-steel and ceramic-steel contacts. Two AW additives were applied: a conventional secondary zinc dialkyldithiophosphate (ZDDP) and an oil-miscible phosphonium-phosphate ionic liquid (IL). Tests were carried out using reciprocating ball-on-flat...
Austenitic stainless steels are traditionally not good bearing materials due to their tendency to gall when rubbing against other hard alloys. Even worse, they cannot be well-lubricated by hydrocarbon oils. In this study, an alternative carburization process, low-temperature colossal supersaturation (LTCSS), offers a potential solution by demonstrating an improvement of wear-resistance by three orders...
Sliding friction and wear characteristics of aluminum alloys against AISI 52100 steel lubricated by ionic liquids (ILs) were investigated at both room and elevated temperatures. The tested aluminum alloys include a commercially pure aluminum Al 1100–O, a wrought alloy Al 6061–T6511, and a cast alloy Al 319–T6. The lubricating performance of two ILs with the same anion, one ammonium-based [C 8...
Erosion protection coatings are developed and characterised in order to protect aeronautic structures susceptible for damage caused by liquid and solid impact, e.g. the leading edges of the wings, the radome or the leading edges of rotor blades. Substrates for all coatings are aluminium alloys (AA2024) coated by an epoxy primer. There are two principle sources for erosion damage: sand and rain erosion...
In order to meet stricter emissions requirements, advanced heavy duty diesel fuel injection systems will be required to resist scuffing at higher pressures, temperatures and in ultra low-sulfur fuels. Using a 3D friction-scuffing mapping technique, scuffing transition diagrams were generated for diesel fuel injector materials to exemplify the effects of surface finish and sliding velocity on scuffing...
Recent attention to the improvement of line-haul truck brake effectiveness, to compensate for lowered aerodynamic drag and to increase road safety, has prompted the US Department of Energy to support several projects aimed at the development of lightweight, high-performance friction materials. Using a specially designed, sub-scale disc brake testing system, a series of experiments was conducted to...
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