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The tribology of diamond-like carbon (DLC) films has been studied for decades, but their friction and wear mechanisms at the nanoscale still remain unclear due to experimental limitations. To address this challenge, the friction and wear between DLC films and diamond tips are investigated via molecular dynamics simulations. It is found that the load can increase wear rate of the DLC film by inducing...
Surface texturing to control friction and wear has been the focus of numerous studies in the last few decades. Despite this interest, understanding the underlying causes for surface texturing effects under different contact and lubrication conditions remains a subject of continuing controversy. Although there has been progress in the fabrication of precise surface textures and modeling of their influence...
Hadfield steel is characterized both by high wear-resistance and ability to strain hardening. Due to these properties Hadfield steel is widely used in various industrial applications. The present investigation is aimed at analyzing the deformational behavior of Hadfield steel single crystals with [10 7 1] and [34̅2̅] compression and friction axis orientations, respectively. Consecutive experiments...
Water-lubricated ceramic bearings are currently being used in engineering applications like water pumps, air compressors and marine systems, due to their higher efficiency, reduced environmental impact and simpler constructive designs. In search of low-cost and high-performance tribosystems, bearings made of dissimilar ceramics are not frequently studied, but have potential to show good tribological...
Beyond the sense of sight, the sense of touch is one of the primary ways that individuals experience their surrounding environment. Fundamentally understanding the relationship of skin-surface tribology and its elicited tactile attributes could provide a breakthrough in improving the ability to efficiently transmit tactile information to those who rely on the sense of touch to interact with their...
Skin in biological systems, including humans, perform several synchronized tasks (mechanical, protective, tactile, sensory, etc.). Tribological function is among skin tasks and may determine the survivability of many species. Cross comparison of tribological functional traits of skin of different species, albeit interesting, is rarely encountered, if at all exists, in tribology literature. One interesting...
In-situ Raman spectroscopy was performed on 1010 steel coatings thermally sprayed on an Al-Si alloy on A 380 (Al-9.0% Si) cylinder bore and subjected to reciprocating sliding against various coated rings to investigate the progression of iron oxide formation during sliding. The coatings evaluated for the top compression ring (TCR) included diamond-like carbon (DLC) and chromium nitride (CrN). The...
In field tests, a boric acid based fuel additive has led to reduced fuel consumption. The reduction was substantial, an average of 6 and 10% in passenger cars and diesel generators respectively. Aiming towards improved understanding of mechanisms behind the fuel saving, three methods to mimic the effect of the additive in the piston-ring/cylinder contact have been evaluated. A reciprocating cylinder/flat...
Piston skirt coatings are used in heavy-duty diesel engines for reduction of friction, noise, and scuffing. This study explored the friction and wear behavior of two piston skirt coatings, a polymer-graphite composite coating with a manganese phosphate (Mn-P) interlayer and a standalone Mn-P coating, in API CJ-4 and candidate PC-11 (CK-4 and FA-4) diesel engine oils. Two test configurations were used:...
Marine water-lubricated bearing is the key part of the thrust shafting of underwater vehicles and some surface vessels, that is currently made with rubber, Thordon, Feroform, nylon, lignumvitae materials etc. Because the performance of vibration and noise reduction of the rubber material is better than some materials so that it is usually applied in water-lubricated propeller shaft bearing of submarines...
This paper presents results of an experimental study to evaluate friction stir processing (FSP) with and without hard second-phase particle incorporation as a means to enhance surface properties and wear performance of C86300 manganese bronze alloy. FSP of flat bronze alloy specimens was conducted with hardened H-13 tool steel to create a 3-mm-thick processed surface layer. The process was also used...
In this paper, wear and friction behaviour of high-speed steel (HSS) and indefinite chill (IC) material for rolling a ferritic stainless steel were investigated on a tribometer. A disk specimen of the ferritic stainless steel-B445J1M was pre-oxidised at 1100°C for 30min, and then rotated against a pin at 500°C for 30min. The pin was made of HSS or IC material. It was found that the friction coefficient...
This paper investigates the friction and wear of aluminium high silicon alloy Al-60Si against EN26 steel. The sliding tests were conducted on a pin-on-disk tribometer and the mechanisms of deformation induced by contact sliding were analysed by SEM and EDS. It was found that subsurface deformation and cracks in silicon particles play a central role in the mechanism variation of friction and wear....
Friction at the tool-chip interface and tool-chip adhesion causes severe problems during machining, which reduces the tool life and deteriorate the machined surface quality. To improve the tribological properties at the tool-chip interface and to decrease the tool-chip adhesion, surface texturing of the tools could be a better solution. Therefore, the present study is mainly focused on the cutting...
This paper investigates the use of Electrochemical Jet Machining to surface texture a hyper-eutectic Al-Si cylinder liner material. Samples were lapped to a 6μm finish followed by immersion in 1mol NaOH to expose the primary silicon colonies above the aluminium surface. Texturing was carried out using a NC system comprising of a fine gauge nozzle (cathode) jetting a solution of 2.3mol NaCl on the...
Road accidents increase during the first rain after a long dry period. It is widely accepted that the tire traction loss is due to fine particles accumulated on the road surface. Yet, the involved mechanisms at the tire/road interface are not clearly understood.This paper deals with the particle-induced lubrication on dry road. Tests are performed in laboratory. Sediments are extracted from a catchment...
This paper presents an experimental study of friction and wear performance of quaternary CrSiCN coatings deposited on a hardened H-13 steel substrate by a plasma enhanced magnetron sputtering (PEMS) technique. Friction and wear tests were conducted with a reciprocating line contact between a hardened 4370 steel roller and coated and uncoated flat specimens under dry and lubricated conditions. The...
The frictional capacity of rubber-tired metros decreases over time under the action of metro traffic. It is well known that the texture of rolling tracks contributes to evacuate water from the tire/track interface and generate friction forces. There is then a need to understand the evolution under traffic of the texture of rolling tracks to optimize their maintenance in terms of surface texturing...
This paper investigates the effect of sample size on the friction and wear of a bulk metallic glass (BMG), Ti40Zr25Ni3Cu12Be20. The sliding tests were conducted on a pin-on-disk tribometer and the microstructural analyses were carried out by SEM and TEM. It was found that friction and wear of BMG change with sample size. The fracture strength and plasticity of BMG play a central role in the mechanism...
Particle-reinforced aluminum matrix composites (Al-MMCs) generally exhibit lower wear rates and more stable friction than their un-reinforced matrix materials. Cold spray is a popular consolidation route for Al-Al2O3, allowing for its application as a coating for corrosion and tribological protection. Previous work by the authors has found that 22wt.% of angular Al2O3 particles (sample ANG22) leads...
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