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We have investigated the mechanical stability of a coating consisting of a single 10nm thin silver film embedded in an otherwise brittle multilayer under sliding contact. Using in situ monitoring of the contact zone during sliding, we show that for large friction coefficients the steady state scratch propagation is driven by the 3D plastic deformation of the thin silver layer at the front of the contact...
In this paper, we investigate the failure mechanism under scratch testing of glass samples coated with an Si 3 N 4 monolayer deposited by magnetron sputtering. We demonstrate that applying a thin Si 3 N 4 layer considerably compromises the effective glass strength. Contact and fracture mechanics conspire to produce this result when a stiff and well adherent film is...
The mechanical and tribological performances of polycarbonate film and nano-SiO 2 /polycarbonate composite coating are studied with micro/nano-scale indentation and scratch tests using Hysitron TriboIndenter. The experimental results show that the hardness and stiffness are increased apparently after the addition of nano-SiO 2 . The scratch tests indicate that the nano-SiO 2 ...
In our pervious studies [Z. Zhang, C. Breidt, L. Chang, F. Haupert, K. Friedrich, Enhancement of the wear resistance of epoxy: short carbon fibre, graphite, PTFE and nano-TiO 2 , Composites A 35 (2004) 1385–1392; L. Chang, Z. Zhang, C. Breidt, K. Friedrich, Tribological properties of epoxy nanocomposites. I. Enhancement of the wear resistance by nano-TiO 2 particles, Wear 258 (1–4)...
The tribological performances of epoxy-based composites, filled with short carbon fibre, graphite, PTFE and nano-TiO 2 in different proportions and combinations, were investigated. The patterns of frictional coefficient, wear resistance and contact temperature were examined by a pin-on-disc apparatus in a dry sliding condition under different contact pressures and sliding velocities. The experimental...
In the present paper, an artificial neural network (ANN) approach was applied to the erosive wear data of three polymers, i.e. polyethylene (PE), polyurethane (PUR), and an epoxy modified by hygrothermally decomposed polyurethane (EP-PUR). Three independent datasets of erosive wear measurements and characteristic properties of these polymers were used to train and test the neural networks. For the...
Using a multiple-layer feed-forward artificial neural network (ANN), the specific wear rate and frictional coefficient have been predicted based on a measured database for short fibre reinforced polyamide 4.6 (PA4.6) composites. The results show that the predicted data are well acceptable when comparing them to the real test values. The predictive quality of the ANN can be further improved by enlarging...
An optical system for the implementation of a new real time roughness measuring technique was incorporated to a two-disk machine. The change in surface roughness during the running-in stage of partial elastohydrodynamic lubricated wear tests was measured in a real time mode. The results were compared with the experimental data, which were measured, in a conventional manner, at discrete intervals of...
Some potentially active heterocyclic compounds including 2-(di-n-octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in liquid paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy...
In this paper, the tribological properties of La(OH) 3 nanocluster modified by compound containing nitrogen as additive in liquid paraffin were investigated using four-ball machine. The results show that La(OH) 3 nanocluster modified by compound containing nitrogen as additive in liquid paraffin has high load-carrying capacity, good antiwear and friction reduction properties. The lubricating...
Considering that harder asperities on one surface would plastically deform the contact areas of a softer counterpart surface, a theoretical model has been developed to describe the steady sliding wear in a system of an alumina particle reinforced aluminium metal matrix composite pin on a steel disk. The model predicts that the volumetric wear of the pin-on-disk system is proportional to the applied...
Three kinds of metal-plastic multilayer composites, which were composed of a steel backing, a middle layer of sintered porous bronze and a surface layer of polytetrafluoroethylene (PTFE) filled by Pb or Cu 2 O powders, were prepared. The friction and wear properties as well as the limiting pressure times velocity (PV) values of these metal-plastic multilayer composites sliding against 45 carbon...
Four kinds of polytetrafluoroethylene (PTFE)-based composite, pure PTFE, PTFE + 30vol.%Cu, PTFE +30vol.%Pb and PTFE + 30vol.%Ni composite, were prepared. The friction and wear properties of these metal powder filled PTFE composites sliding against GCr15 bearing steel under both dry and lubricated conditions were studied using an MHK-500 ring-block wear tester. The worn surfaces of the PTFE composites...
Sealing problems for reciprocating pumps or intensifiers operating at high pressures (above 100 MPa) may be solved by adopting a closely fitting externally pressurized sleeve. This paper presents an elastohydrodynamic (EHD) analysis for such high pressure sleeve type seals and examines the effects of structural and operational parameters on their high pressure performance characteristics. The effects...
The synthesis of a new type of oil additive, 4,5-di(cetyl thio)-1,3-dithiol-2-thione, is described. The thermal stability of the compound was investigated by thermal gravity analysis (TGA). The tribological properties of the compound as additive in liquid paraffin were also evaluated using a four ball tester. The results show that the novel compound has good tribological properties in liquid paraffin...
This paper reports the preparation and structure characterization of dialkyldithiophosphate (DDP) modified Mo-S compound nanoclusters by a chemical method and identified by UV-Vis absorption spectra, FTIR. XPS, and 31 P NMR. Mo-S compound nanocluster as an additive in paraffin oil is found to significantly reduce wear and friction of the steel balls in a four-ball test. When the Mo/S/DDP...
A complex of lanthanum dialkyldithiocarbamate and phenanthroline was synthesized, and its lubricating and antiwear behaviors as an additive in lithium grease were evaluated using a Timken tester with a SAE52100 steel ring sliding under an Al 2024 block. As a comparison, the wear behavior of a steel-on-steel system under the lubrication of the same grease was also investigated under the same test conditions...
A complex of lanthanum and N-salicylidene derivative of malonic, dihydrazide (Schiff base) was synthesized, and its tribological properties as additive in lithium grease were evaluated using a block-on-ring wear tester with a SAE52100 steel ring against an Al 2024 block. The protective film formed on the rubbed surface of aluminum was investigated by SEM, XPS and AES. Friction and wear tests reveal...
A kind of polytetrafluoroethylene (PTFE) based multilayer self-lubricating composite material, made of a steel backing, a sintered porous bronze middle layer and a surface layer consisting of a mixture of PTFE and Pb powders, was prepared. The friction and wear properties as well as the limiting PV (pressure times velocity) values of the PTFE composite sliding against stainless steel with lubrication...
One N-salicylidene derivative of malonic dihydrazide (Schiff base) and its complexes of lanthanum and copper were synthesized. Their tribological properties as additives in lithium grease were evaluated using a four-ball machine. The results indicate that these compounds possess good load-carrying capacity, friction reduction, and anti-wear properties. In particular, the complex of lanthanum has excellent...
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