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Coefficient of friction is a significant factor for investigating stress and strain on the contact surface for a problem on torsional fretting wear. First, in this paper, a variable coefficient of friction model related to space and time is introduced. The evolution of friction coefficient is governed by the local contact history and the slip distance. Then, this model is implemented in the finite...
An optimized low-temperature plasma carbonitriding process at 430°C for 15h was used to treat the surface of 316LVM medical grade austenitic stainless steel. By using a servo-hydraulic dynamic test machine, the fretting behaviour of both as-received and the surface-treated 316LVM plate samples against martensitic stainless steel balls was studied in the Ringer's solution at various displacement amplitudes...
Nickel-based self-fluxing alloys (SFA) have been widely used as coatings in the light of their high levels of wear and corrosion resistance. However, their resistance to wear can be substantially improved by reinforcement with tungsten carbide–cobalt hardmetals. In this work, a range of coatings based on a nickel-based self-fluxing alloy has been produced by laser cladding. The coatings have been...
WC–Co coatings were deposited by HVOF spraying from two different feedstock powders, one with a conventionally sized WC grains and one with nanoscale WC grains. The powder feedstock with nanoscale WC grains was employed in the light of published research, which pointed to enhancements in wear resistance associated with nanoscale structures in WC–Co materials. The coatings were subsequently laser remelted...
High speed sliding with electrical current has been studied frequently due to its many important industrial applications. In this paper, a friction test machine with the capacity up to 75m/s sliding speed and 100A current was constructed, and friction and wear performance of a carbon-graphite material under high speed sliding with and without current was studied. The effects of the load, sliding speed...
Friction and wear tests of pure polymers, polytetrafluoroethylene (PTFE), nylon 6, and polymethyl methacrylate (PMMA), vs. stainless steel were carried out on an MM200 tester. The XPS spectra and the atomic relative concentrations of elements on friction surfaces of stainless steel were analysed. The ESR spectra of radicals in polymer wear debris were determined. The results indicate that complex...
The temperature distributions on the surface of Si 3 N 4 and Ti(CN) ceramic cutting tools for turning different metallic materials were calculated and plotted using computer simulation based on a mathematic model of heat sources. The results showed that the temperature on the rake face of the ceramic cutting tools for turning 18-8 stainless steel was much higher than that fur turning...
A ball-on-disc wear tester was employed to study the effects of an oxy-nitrided steel surface on the lubricating performance of oil additive tricresyl phosphate. Mechanisms of the effects were discussed based on the analytical results obtained with several surface analysis methods. It was found that tricresyl phosphate showed much better anti-scuffing and anti-wear properties on an oxy-nitrided steel...
A ball on disc machine was employed to study the tribological behavior of the oil additive sulfurized olefin on oxynitrided steel surface. Disc wear surfaces were analyzed with a X-ray photoelectron spectrometer and an Auger electron spectrometer. It was found that sulfurized olefin showed a very good effect on increasing load carrying capacity and a certain effect on decreasing friction for oxynitrided...
The transition of wear mechanisms and the microstructural changes of the SiCw-Al composites under unlubricated sliding friction were studied by X-ray diffraction, scanning electron spectroscopy and transmission electron spectroscopy techniques. The results show that with the increase of normal load and/or speed during dry sliding, the wear behaviour of the SiCw-Al composites transforms from mild wear...
In this paper, the tribological behavior of the additive sulfurized olefin on Ni-P brush plating layer was studied systematically on a 'ball-on-disc' testing machine. The composition of lubricating films on wear surfaces was analysed with XPS and AES. It was found that the addition of SO in lubricating oil could increase very much the load carrying capacity and decrease obviously the wear rate of...
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