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The topographic effect of steel counterface, finished by mechanical grinding with Ra ranging from 0.01 to 0.95µm, on the structure and functionality of the tribofilm of a hybrid nanocomposite, i.e. epoxy matrix filled with monodisperse silica nanoparticles, carbon fibers and graphite, was systematically investigated using a pin-on-disc sliding contact geometry. The nanostructure of the tribofilm was...
The nanostructures and properties of the tribofilms of epoxy (EP) composites filled with short carbon fibers (SCF) and different volume fractions of monodisperse silica nanoparticles were investigated. When the conventional composite filled only with SCF was considered under a high pv condition, an iron oxide layer is formed on the steel counterface. The addition of even only 0.05vol% nano-silica...
Developing anti-wear polymer composites for applications under boundary lubrication conditions is becoming a key topic for a wide range of industrial applications. Special interest is the usage of fuel as lubricant. In this work, it was found that composites tailored for dry sliding applications perform differently under diesel-lubricated conditions. The sliding performance of epoxy-based materials...
Solid lubricated ball bearings can be a choice, if standard lubrication cannot be used, as for example because of surroundings like high temperature or vacuum. Law enforcements as well can be a reason for choosing such bearings. Although molybdenum disulfide (MoS 2 ) as one kind of solid lubrication for ball bearings has been known for 60 years, a universal valid lifetime prediction has not...
The present work focuses on the role of monodispersed SiO 2 -nanoparticles, with an average diameter of 20nm (as introduced via a sol–gel process), on the tribological behavior of conventional epoxy (EP) composites, i.e. EP filled with short carbon fibers and graphite flakes. Moreover, the contribution of these nanoparticles was directly compared to that of sub-micron (TiO 2 /ZnS)...
In the present work, the effects of fiber orientation on the tribological behavior of a short carbon fiber (SCF)/PTFE/graphite (10vol.% for each) filled PEEK composite was studied under different nominal pressures ranging from 1MPa to 5MPa. The fiber orientations were parallel, anti-parallel and normal relative to the sliding direction. The results indicate that the effect of fiber orientation shows...
Wear debris contains extensive information on the tribological behaviours of materials [M.Q. Zhang, Z.P. Lu, K. Friedrich, On the wear debris of polyetheretherketone: fractal dimensions in relation to wear mechanisms, Tribol. Int. 30 (1997) 87–102]. Investigations on wear debris morphology will be helpful for understanding materials’ friction and wear processes. In this work, the wear debris obtained...
The tribological behaviors of three poly-ether-ether-ketones (PEEKs) with different molecular weights and their SCF (short carbon fiber)/graphite/PTFE (polytetrafluoroethylene) filled composites were examined using a block-on-ring apparatus under dry sliding conditions. Tensile tests, hardness measurements and dynamic mechanical thermal analysis (DMTA) of the PEEK based materials were also performed...
In this work, polyetheretherketone (PEEK) and PEEK/SiC-composite coatings were deposited on Al substrates using a printing technique to improve their surfaces performance. The objective of this work was to investigate coatings friction and wear behaviour. Especially, the effect of sliding velocity and applied load on coatings friction coefficient and wear rate was evaluated in range of 0.2–1.4m/s...
The friction and wear of self-mated mullite-zirconia-toughened mullite (ZTM)-TZP ceramics have been investigated using a block-on-ring tribometer in different lubricants at varying loads. Load-dependent wear transitions were observed for these ceramics. The wear transition was usually accompanied by the abrupt change of friction coefficient and wear rate. The main pretransition wear mechanisms are...
A CeF 3 compact with 10% silver in volume on the substrate of Hastelloy C was prepared in the paper. Effects of abrasive paper on the composition and surface roughness of the compact were studied. The effect of silver on the sliding friction and wear behavior of CeF 3 , compact at temperatures to 700°C in air was investigated. By adding 10% silver in volume in CeF 3 , compact,...
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