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Experiments are performed to analyze wear generated by low load sliding impacts on ferrite steel and stainless steel samples. Low load impacts are defined by a normal force such that the apparent contact pressure remains below the yield strength of the material. Nevertheless, concentration of pressure at the top of asperities may generate local plastic deformation. Beyond a running-in period, repetitive...
In this study, three kinds of calcite calcium carbonate nanoparticles (CCNP) with different average diameters as eco-friendly grease additives were successfully fabricated via the carbonation method. The morphologies and phase compositions of the CCNP were determined via XRD, FTIR and TEM. The effects of the concentration and size of synthesized products on the tribological properties of grease have...
Diamond-like carbon (DLC) coatings offer excellent mechanical and tribological properties. They provide ultra-low friction and superior wear resistance. In recent years, the research of DLC coating focuses on the application of these coating in mechanical components which work under boundary lubricated conditions. Since conventional lubricants and lubricant additives were formulated for metal surfaces,...
Paper can be coated with liquid flame spray (LFS) generated nanoparticles to control the wettability of its surface from hydrophilic to superhydrophobic. The adhesion of the nanoparticles on paper is of interest both for understanding the product durability during its lifetime and for product safety issues. Poor particle adhesion influences the desired functional properties and released nanoparticles...
Nanoscale three-body and two-body abrasive wear on the monocrystalline silicon are investigated using a large-scale molecular dynamics approach. A nanoscale model of three-body abrasion is proposed to evaluate the movement pattern of a sphere particle. It is concluded that the rolling movement of a particle is observed without sliding in the present nanoscale computation process. It is found that...
SU-8 polymer is an emerging structural material for micro-fabrication of MEMS/NEMS devices using photo-lithography process. However, poor tribological properties of SU-8 restrict its wide applications as a very reliable MEMS material. In our earlier work [1], we have developed SU-8 composites which reduced friction and enhanced wear life of SU-8 by more than four orders of magnitude. The improvements...
In many adhesive wear processes, transfer of material from the donor surface results in the formation of lumps or a continuous layer on the countersurface. The morphology of the transferred layer is important for the tribological behaviour of the resulting interface. If the lumps formed on the countersurface are harder than the donor surface, abrasion of the donor surface will be the consequence of...
Abrasive wear testing using the ASTM G65 test is often used to simulate wear in different applications in cement, mining and earth-moving industries. As an alternative, a newly developed compression-twist (CT) test can be applied to simulate abrasive wear at higher contact pressures than the ones of the well established G65 test. Using different tool steel and cast iron materials, the ASTM G65 test...
The slurry erosion behavior of a zirconium based bulk metallic glass, Zr 44 Ti 11 Cu 10 Ni 10 Be 25 , was evaluated in this study. Slurry erosion tests were carried out using a non-circulating type test rig at impingement angles of 30°, 60°, and 90°. Commonly used hydroturbine steel was evaluated under the same test conditions. At 30° impingement angle, the...
Aluminum (Al)–carbon nanotube (CNT) composites are promising candidates for friction and wear applications. The wear behavior of Al–CNT composites, with up to 5wt% homogeneously dispersed CNTs, is investigated in the present study and compared to that of pure aluminum processed using the same technique of cold compaction and hot extrusion. The effects of CNT content, sliding speed and applied load,...
Wear rate transitions for friction brake materials can be brought about by changes in the dominant wear mechanisms during operation. In order to investigate such effects, the relationship between the dry sliding wear rates of two commercial, semi-metallic friction materials, against a conventional cast iron counterface, have been investigated using a block-on-disc geometry. Applied load has been varied...
The present work aims are to study the dry sliding wear behavior of WC-12wt%Co materials, with or without addition of Cr 3 C 2 /VC grain growth inhibitors, and to sinter them by two different consolidation techniques: conventional sintering and spark plasma sintering (SPS). The dry sliding wear tests were performed on a tribometer with a ball-on-disc configuration using a WC–Co ball...
C f /Mg composites were fabricated by extrusion directly following vacuum pressure infiltration technique (EVI). Fiber distribution and wear behaviors of the composites were investigated. For comparison, C f /Mg composites were also fabricated by squeeze casting as references. Dry wear tests were carried out at room temperature under a normal load of 100N, at a sliding velocity of...
Molecular dynamics simulations were carried out to investigate the wear formation of a truncated-cone-shaped tip sliding against a rigid flat substrate. Under a constant normal load, the worn volume of the tip increases sub-linearly with the sliding distance, which holds true for three distinct debris definitions (geometry-based, material-transfer-based and displacement-based). Under a constant normal...
High resistivity against hard abrasive wear conditions can be obtained by coating the bulk low cost base material with high performance tool steel coating. In this study, thick wear resistant coatings of vanadium carbide reinforced tool steel were manufactured with conventional PTA-welding technique. Two different coated test piece configurations were prepared for wear tests and microstructure characterization...
In this study progress of the wear on the bearing surfaces of nitrided dies for aluminium (AA6063) hot extrusion is demonstrated and explained. Two groups of nitrided AISI H11 tool steel dies were analysed, with relatively short and long bearing surfaces. It was found that bearing surface length in relation to the microstructure of the nitrided exit edge should be considered especially in the case...
Tribological behavior of PTFE composites is well known to be affected by factors depending mainly by matrix and filler properties. However, the mechanism taking place has not still been fully explained. In this work, the attention was focused on the variation of crystallinity due to the presence of fillers and it was connected with the transition phases to which the PTFE is subjected. In particular,...
The aim of this work is to investigate the stick–slip phenomenon under friction of CrV(x)N (x=0%, 12%, 27%, and 35%) coatings at room and high temperatures. The effects of vanadium (V) content and the temperature on the friction and stick–slip parameters for the contact pair: coating-ceramic ball were analyzed. The amplitude – a difference between the maximal and minimal values of the friction force,...
This paper summaries the development of a damage model to predict the deterioration rates of the wheel tread in terms of wear and rolling contact fatigue (RCF) damage. The model uses a description of a fleet's route diagram to characterise the duty cycle of the vehicle in terms of curve radius, cant deficiency and traction/braking performance. Using this duty cycle a large number of vehicle dynamics...
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