Showing papers in "Tribology International in 2004"

TL;DR: In this paper, the authors provide a comprehensive overview of various lubrication aspects of a typical powertrain system including the engine, transmission, driveline, and other components, as well as the integration of these lubrication and surface engineering concepts into a unified automotive power-train system.

TL;DR: The most important subclasses of diamond-like carbon (DLC) coatings are hydrogenated amorphous carbon (a-C:H) and hydrogen free tetrahedral amorphus carbon (ta-C) as discussed by the authors, which can be used in different industrial applications such as magnetic storage media, diesel injection pumps, sliding bearings, car valve rockers, gears, tappets of racing motorcycles, VCR head drums, textile industry parts, motor cycle forks, razor blades, etc.

TL;DR: In this article, a new class of diamond-like carbon (DLC) films were developed that provided friction and wear coefficients of 0.001−0.005 and 10 −10−10 −10 −9 mm 3 /N m, respectively, in inert-gas or vacuum test environments.

TL;DR: In this paper, the influence on sliding friction of ultrasonic vibration both parallel and perpendicular to the sliding direction has been studied for samples of aluminium alloy, copper, brass and stainless steel sliding against tool steel.

TL;DR: In this article, the ionic liquid 1-ethyl-3-hexylimidazolium-bis(trifluoromethylsulfonyl)-imide was synthesized and evaluated as lubricant for the contact of steel/steel.

TL;DR: Graphit-iC and DymoniC as mentioned in this paper are two hard, carbon-based solid lubricant coatings which have been developed which offer considerable benefits over traditional diamond-like carbon (DLC) coatings.

TL;DR: In this article, the effects of kurtosis and skewness on different levels of surface roughness are investigated independently by adopting the Pearson system of frequency curves and used in conjunction with a static friction model for rough surfaces to calculate the friction force and friction coefficient.

TL;DR: In this paper, the influence of test speed and applied pressure values on the friction and wear behavior of polyamide 66 (PA 66), polyoxymethylene (POM), ultrahigh molecular weight polyethylene, 30% glass fibre reinforced polyphenylene-sulfide (PPS+30%GFR) and aliphatic polyketone (APK) polymers were studied.

TL;DR: A series of polyetheretherketone-based composites was investigated, blended with different contents of polytetrafluoroethylene and/or graphite, and reinforced with various amounts of short carbon fibres as discussed by the authors.

TL;DR: In this article, the authors presented the tribological properties of carbon onions prepared by heat treatment of diamond clusters or particles, where diamond clusters used as the source material are heated with an infrared radiation furnace to 1730 °C in argon at atmospheric pressure.

TL;DR: CheChevalier et al. as discussed by the authors developed a criterion for the fully flooded and starved transition of an oil-lubricated contact based on four primary factors controlling lubrication level; these are volume of oil, contact dimensions, oil viscosity and speed.

TL;DR: In this paper, the misalignment caused by shaft deformation is considered when analyzing the lubrication of a journal bearing and the results show that there are obvious changes in film pressure distribution, the highest film pressure, film thickness distribution, and the least film thickness expression of the misaligned journal bearing.

TL;DR: In this paper, the authors compare traditional lubrication concepts and those necessary for nanolubrication and propose various nanometer scale thick lubricating film designs as a means to control the surface properties of surfaces at nano/micro scales.

TL;DR: In this article, the influence of oil temperature on gear failure modes, as well as their introduction into load carrying capacity calculation methods are shown. But the often-applied practice of increasing the severity of a gear oil test method by increasing the oil temperature has to be revised.

TL;DR: In this paper, a numerical procedure for the simulation of non-Gaussian surfaces has been developed, which can simulate surfaces with given skewness and kurtosis and with spectral density or auto-correlation function.

TL;DR: In this article, the tribological properties of Ni-WC composite coatings, electrodeposited on steel substrate, were investigated using a small amplitude reciprocating friction wear tester.

TL;DR: In this paper, the performance of a worn plain journal bearing was evaluated with a static load varying from 5000 to 30,000 N with a rotational speed varying from 1000 to 10,000 rpm.

TL;DR: In this article, the authors focused on the loss of superlow friction and on its restoration through the introduction of hydrogen gas in the friction (or sliding) environment, which enabled the understanding of the degradation of the friction coefficient and the healing mechanisms by hydrogen.

TL;DR: In this article, the effect of copper on the wear behavior of the alloys was explained in terms of their microstructure, hardness, tensile strength, percentage elongation and microhardness of the α phase.

TL;DR: In this paper, a molecular basis of how lubricant and additives function in lubrication is provided, along with additional insights of how antiwear films work in the lubrication system.

TL;DR: In this paper, the authors measured the coefficient of friction for carbon fiber epoxy matrix composite, HTA-6376, in contact with aluminum, 3637-77, in reciprocal sliding.

TL;DR: The spark-ignited reciprocating internal combustion engine has been the powerplant of choice for automotive and light truck applications for over 100 years and whether this engine type will remain dominant in the future will depend on automakers’ ability to find economically viable solutions to many constraints.

TL;DR: In this article, a complete numerical solution to the transient thermo-elastohydrodynamic lubrication (EHL) problem of an involute spur gear is obtained by using simplified multigrid method.

TL;DR: In this article, the effects of added materials such as titanium (Ti), molybdenum (Mo) and iron (Fe) diamond-like carbon (DLC) films on boundary lubrication and microtribological properties were investigated.

TL;DR: In this article, a diamond-like carbon (DLC) was used for CVD with methane gas on soft-material substrates, such as rubber and aluminum, and friction and wear tests were conducted using a ball-on-disk test.

TL;DR: In this article, a new foil bearing, ViscoElastic Foil Bearing (VEFB), is proposed to suppress the nonsynchronous orbit of turbopumps, turbocompressors and turbochargers.

TL;DR: In this paper, the performance of a typical zinc dialkyl dithiophophosphate (ZDDP) added to a paraffin base oil was analyzed and it was shown that the antiwear performance of ZDDP depends on the recovery and growth of effective surface films.

TL;DR: Carbon offers the kind of flexibility that one needs in the design and production of chemically unique microstructures with properties ranging from superlubricity to super-hardness and/or -softness as discussed by the authors.

TL;DR: In this article, the experimental and CFD study on the mass flow-rate characteristic through an orifice-type restrictor in aerostatic bearings was conducted, and the results showed that the Mass Flow Rate through an Orifice is different from that through a nozzle.

TL;DR: In this paper, the wear mechanisms of the bronze-graphite composite were discussed based on examination of the worn surface morphologies of both the composite block and the stainless steel ring by means of scanning electron microscopy equipped with an energy dispersion spectrometry and on determination of some typical elements on the worn surfaces.