Showing papers in "Tribology International in 1998"

TL;DR: In this article, different types of interactions between the sliding particles and the wearing surface of the solid are distinguished between hard particles sliding on a softer solid surface and displaying or detaching material, and the theoretical models are supported by a lot of experimental results from studies on metallic or ceramic materials.

TL;DR: In this article, a generalised holistic approach to the friction and wear mechanisms of coated surfaces in dry sliding contacts is presented, which is based on a classification of the tribological contact process into macromechanical, nanomechanical and tribochemical contact mechanisms and material transfer.

TL;DR: In this paper, a review of the models developed to account for the generation of oxide during sliding and the effects of such oxides on the rates of wear was presented, focusing on high-speed unidirectional sliding and low-speed reciprocating sliding.

TL;DR: The paper focuses on the choice of lubricant, the degree of motion and the positioning of components in joint simulator testing, which is greater with higher doses of irradiation and is much more effective for the hip than for the knee.

TL;DR: In this paper, the authors discuss the importance of environmental compatability tests for all those who are working in the fields of production, application, and disposal of lubricants, using the three examples Coolants and Metal Working Lubricants, Engine Oils, and Fast Biodegradable Lubricant and Operational Fluids.

TL;DR: In this paper, the authors investigated the mechanisms by which Modtc reduces friction in the centirange under boundary lubrication using analytical tribometry and concluded that only a few per cent of dispersed MoS2 is sufficient to lubricate at the same level as pure MoS 2.

TL;DR: In this article, wear processes and mechanisms for wear transitions with sliding time and temperature during sliding of a nickel-based alloy, N80A, in oxygen at temperatures to 250°C are discussed.

TL;DR: A broad overview of the general area of polymer tribology is presented in this paper, where the progress in understanding the field over the past decade is reviewed under the three topics of rubber tribology, plastic tribology and tribology of polymer composites.

TL;DR: In this article, the work of adhesion is defined as the work to separate unit area of the interface, whatever its physical origin; intermolecular forces, electrostatic forces or capillary action.

TL;DR: In this paper, the effect of ZDDP oil solution chemistry changes due to thermal decomposition, on anti-wear and thermal film chemistries, film thickness and wear, was investigated.

TL;DR: In this paper, the deformation of silicon monocrystals subjected to two-body and three-body contact sliding with the aid of the molecular dynamics analysis was discussed, and a new friction law and a concept for wearability evaluation were proposed.

TL;DR: In this article, a synthesis of several strands of recent surface engineering research at the University of Birmingham is presented, including the duplex ceramic coating-nitrided steel system, and the Duplex DLC coating-oxygen diffusion treated titanium system.

TL;DR: Wear-mechanism maps as mentioned in this paper provide a more global picture of how materials in relative motions behave when different sliding conditions are encountered; they also provide the relationships between various dominant mechanisms of wear that are observed to occur under different sliding condition as well as the anticipated rates of wear.

TL;DR: In this paper, nanometer zinc borate with a particle size of 20-50nm was prepared using the ethanol supercritical fluid drying technique using the nanometer crystal zinc boron.

TL;DR: Amorphous ferric oxide with a particle size of about 20-50 nm was prepared using the ethanol supercritical fluid drying technique in this paper, and the tribological properties of 500 SN oil containing nanometer particles were measured using four-ball and block-on-ring tribotesters.

TL;DR: A review of the use of what are essentially extensions of the scratch hardness method as a means of probing the surface mechanical properties of polymers for applications in tribology studies can be found in this paper.

TL;DR: In this article, a review of high pressure rheology leads to the conclusion that the results from rheometers may be used to generate empirical rate equations which are useful in modelling elastohydrodynamic traction.

TL;DR: In this paper, a theoretical study of squeeze film behavior for a finite journal bearing lubricated with couple stress fluids is presented, and the modified Reynolds equation is obtained by using the Stokes equations of motion to account for the couple stress effects due to the lubricant blended with various additives.

TL;DR: In this article, the authors describe practical ways in which lubrication models have been developed and applied to key sub-systems (valve trains, piston assemblies and bearings) in engines to gain insight into the optimisation of overall performance.

TL;DR: In this paper, the tribological performance of a carbon fiber reinforced PEEK composite as a bearing surface for total hip replacement was investigated, and an excellent wear couple was identified to be a 30 wt% pitch-based carbon-fiber reinforced PE composite acetabular insert articulating against a zirconia ceramic head.

TL;DR: In this paper, a series of plasma sprayed alumina coatings were evaluated regarding their erosion and abrasion characteristics, using axial injection plasma spray system, and with powders of different grit sizes and crystallinity.

TL;DR: Abrasive and erosive wear tests are increasingly applied to surface engineered components, since they have the potential for use as quality assurance methods as well as for more fundamental tribological characterisation as mentioned in this paper.

TL;DR: A review of friction and wear studies of poly(ether ether ketone) (PEEK) blended with other polymers is presented in this paper, where a number of investigations into the tribology of PEEK blended with poly(PEI), polytetrafluoroethylene (PTFE) and liquid crystalline polymers (LCPs) have been reported.

TL;DR: In this paper, several key issues in friction, heat transfer, lubrication, wear and fatigue of hot metal forming are discussed, and it is concluded that progress will be made through a combination of techniques, including laboratory simulation, computer modelling and industrial trials.

TL;DR: Fractal methods have been used for the characterization of wear particles as mentioned in this paper, in terms of their shape, size and surface texture, and have shown promising results, especially in characterizing the surface anisotropy and directionality.

TL;DR: In this paper, the PMMA flat and a steel ball were investigated under various contact zone kinematic conditions and different wear patterns were produced depending on the contact kinematics.

TL;DR: In this paper, the inlet and outlet lubrication properties of the piston ring were investigated and the effective width of the ring was determined and the minimum film thickness and flow rate for the ring pack was calculated.

TL;DR: In this paper, a theoretical study of slider bearings in general form is presented, considering the lubricant to be an isothermal, incompressible electrically conducting couple stress fluid in the presence of a uniform magnetic field.

TL;DR: In this article, the effects of chemical parameters (temperature and concentration of reagent) and tribological parameters (load and sliding speed) on the kinetics of the reaction were studied.

TL;DR: In this paper, a high speed journal bearing with a small radial clearance is presented, and the alternation of the attitude locus (eccentricity and attitude angle) and the stiffness coefficients in a loaded journal bearing lubricated with ER fluid is investigated and presented.