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The influence of the transferred particles on the abrasive paper on the wear rate of the hardened bearing steel (SUJ 2) has been studied using the analytical method, which assumed a conical and a frustum grain without, and with, a transferred particle, and the results compared with the trend of the experimental results. The analytical results revealed that the total cross-sectional area plowed by...
Sulphide layers were made on the surface of 1045 and 52100 steels by means of low-temperature ion-sulphurization technique. The tribological properties of sulphide layers under dry conditions in air were investigated on a reciprocating tester. The friction coefficient, endurance life and width of wear scar of sulphurized surfaces were measured. The morphologies and compositions of wear scars and wear...
This paper studies the effects of the heat dissipation capacity of a rubbing material on wear resistance at high temperatures. These effects are studied with a special focus on the dilatation of the thermal energy in sliding. These results suggest a connection between wear transition and the change in the heat dissipation capacity of a rubbing material. The nature of change in the thermal properties...
In the present investigation, a wear resistant polymer, ultra high molecular weight polyethylene (UHMWPE) was melt blended with isotactic polypropylene (PP) in different proportions. Sliding wear tests were conducted by using Cameron Plint pin-on-disc apparatus. Polymer samples in the form of the pin were tested against EN-24 steel disc at different pressures and sliding speeds. The wear volume of...
Particle impact erosion is usually tested experimentally using one of two major types of erosion testing device; the gas-blast tester and the centrifugal accelerator type tester. The influence of the choice of the tester on the erosion results obtained has been recognised, together with the need for a better understanding of particle dynamics within the testers to allow correct interpretation of the...
In this study, a model is proposed which describes the collisions between the asperities of two contact bodies and the heat transfer among them in case of the high speed sliding. Based on the conservation between the frictional work and the generated heat over the frictional interface, formulas for the evaluation of the coefficient of friction are then derived. The coefficient of friction can be directly...
Solid particle erosion of epoxy resin (EP) modified by various amounts of hygrothermally decomposed polyester-urethane (HD-PUR) was studied at oblique (30, 45, and 60 o ) and normal impact (90 o ). The cross-linked structure of the modified EP was characterised by the mean molecular weight between cross-links (M c ). It was established that the initial brittle erosion of the...
In this paper, various metallic cations, including Na + , K + , Ca 2+ and Ba 2+ , were introduced into water-based lubricating additives. Their tribological behaviors were investigated by the tapping test of a Ti-6Al-4V alloy. Among them, Ba-containing compound showed the best lubricating performance. Scanning electron microscopy (SEM) and X-ray photoelectron...
Wear induced by debris formation is studied under fretting and reciprocating sliding conditions. A sintered powder steel alloy is tested. Different compaction conditions inducing various surface porosities change the quantity of oil trapped during the final oil quenching and consequently modify the friction behavior. The study reveals a strong variation of the wear coefficient in relation to the friction...
The boundary lubrication performance of typical electro and magneto-rheological fluids are compared for friction and wear. Given that the MR species seems to have advantages over the ER variety, the tribological mechanism of the former is investigated from the point of interest of providing a basis from which to reach the optimisation potential of the fluid. The investigation involves changing the...
Adhesive wear, generally defined as 'wear due to localised bonding between contacting solid surfaces leading to material transfer between the two surfaces or loss from either surface' is a common phenomenon in many sliding contact tribosystems, e.g. sheet metal forming operations. In these operations, galling, i.e. seizure of the sheet surface caused by transfer of sheet material to the tool surface,...
The classical abrasion model, proposed by Rabinowicz, is founded on the premise that abrasive surfaces are composed of protrusions that are approximately conical. This premise is supported by Kruschov's experiments which show that the wear resistance of pure metals in two body abrasion is linearly related to hardness. This leads to an important question - do most abrasive types exhibit conical behaviour...
Fe-N/Ti-N magnetic multilayers with different thickness of Fe-N layers were deposited on Si (111) wafer by using magnetron sputtering technique. For comparison, Fe-N and Ti-N thin films were also prepared under the same conditions. Microhardness and reduced modulus of the multilayer were measured by using a nanoindenter with a diamond tip in conjunction with an atomic force microscope (AFM). Microfriction...
The aim of the present investigation is to characterize the interface between the SiC p as the reinforcement and Al and Mg metals of the metal matrix composites (MMCs) prepared through vacuum infiltration technique. The weight loss as an index of abrasive wear using pin-on-disc apparatus, the coefficient of friction, the microhardness value and the interparticle distance were determined under...
The influence of sliding velocity and nominal pressure on the tribological behaviour of epoxy resin-inox steel couples is analysed in dry sliding conditions, on a pin-disc configuration. The patterns observed for the friction coefficient, wear coefficient and estimated surface temperature have been correlated to the surface morphology of both pin and disc as results from SEM analysis and profilometric...
The influence of titanium additions up to 0.38% and heat treatment on the abrasion resistance of a commercial 15% Cr-3% Mo white cast iron were examined. The wear resistance of as-cast commercial alloy was improved about 30% by addition of 0.38% titanium after austenising at 1050 o C for 6h and quenching in air. Tempering of quenched alloys at 250 o C for 6h yielded a decrease in hardness...
A comprehensive study of the tool wear mechanism in cutting of metal matrix composites (MMCs) and its dependence on the percentage of reinforcement in the MMCs is presented. The results from machining of aluminium alloy-silicon carbide metal matrix composite (Al-SiC MMC) with tungsten carbide tools show that the main mechanism of tool wear in cutting of Al-SiC MMC includes two-body abrasion and three-body...
This study concerns the behaviour of plasma and flame sprayed modified nickel-chromium alloy (with small aluminium and titanium additions) subjected to the action of simulated post-combustion gases from a coal-fired boiler combustor. The study first evaluates the effects of thermal exposure at high temperature on the adherence between the substrate (austenitic stainless steel) and coatings. Then,...
Zinc dialkydithiophosphate (ZDDP) materials are important antiwear/antioxidant additives in most modern lubrication formulations. The current understanding of the formation of antiwear films from ZDDP involves a tribochemical and thermooxidative component. We examine here the changes in the topography and structure of films formed by the thermooxidative decomposition of ZDDP in base oil. We probe...
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