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This paper presents an assessment of tribological properties of compositions of fuel oil containing fatty acid methyl esters derived from rape-seed oil. An HFRR (high-frequency reciprocating rig – ball-on-flat) apparatus was used in this investigation. The studies were carried out for a steel–steel pair in the concentrated contact.The tribological properties were determined by motion resistances,...
The lubricity of diesel fuel has a direct effect on the service life of the fuel injection equipment, and when alternative fuels are specified, is of vital importance. One such fuel is the Swedish diesel fuel, MK1 which contains low levels of sulphur and low lubricity. This paper investigated the use of ultra low sulphur diesel (ULSD) and fatty acid methyl esters derived from rapeseed (RME) blends...
One important issue in internal combustion engines is the performance of injection pumping systems that is related to the energy efficiency of the engines. Considering that the trend is to increase the combustion pressure, new materials of lower weight, harder, wear and corrosion resistant, and compatible with the fuel environment, are needed. In this work, ball-on-flat reciprocating tests were performed...
The purpose of this work was to evaluate the sliding wear characteristics of SAE 1045 and SAE 52100 steels with different microstructures in the presence of pure biodiesel, a biodiesel-diesel blend (50% diesel+50% biodiesel) and commercial diesel fuel. Non-lubricated tests (dry) were also performed for comparison. For SAE 1045, samples were given a hardening heat treatment (austenitization at 830°C...
A mechanical sealing tribosystem based on multilayer microcrystalline/nanocrystalline diamond (MCD/NCD) coatings is proposed. The tribological behaviour was investigated in ring–on–ring self–mated planar contact configuration. Tests were carried out under biodiesel lubrication and pressurized water (2bar) sealing conditions. A 3D optical confocal profilometer was used to obtain for the first time...
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