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If laser-print could be erased like pencil then entire sheets of office paper could be reused without the need for recycling. This article is a feasibility study on the use of an abrasive process to remove toner-print (the type of print used in laser-printers and photocopiers). The effect of varying abrasive grit size, speed, distance, load and repetition are explored. Two distinct wear regimes were...
The effects of charging and outgassing on friction and wear of Ni–P amorphous and nanocrystalline coating have been studied under ambient humidity and temperature. The results indicate that charging can improve the wear durability for Ni–P amorphous coating and inhibit formation of wear crack for brittle Ni–P nanocrystalline, which is due to atomic hydrogen because the wear behavior will restore after...
A group of novel polytetrafluoroethylene (PTFE)-based composite materials are developed for sliding bearing applications. The reinforcements include the newly developed T-401 Tribaloy alloy, which possesses better ductility compared to conventional Tribaloy alloys, spherical bronze particles, chopped carbon fibers and milled graphite. The specimens are fabricated with the compression moulding technique...
Use of composite material is increasing due to economical processing of complicated shapes in large quantities. Addition of fiber/particulates improves the composite strength. In the current study, the tribological characterization of polymer based particulate composites which are processed at room temperature are investigated. The friction and wear behavior of polystyrene reinforced with steel powder...
Dry sliding wear behaviour of A356–TiB 2 composites in T6 condition was tested using a pin-on-disc wear testing machine. The composites were prepared by the reaction of a mixture of K 2 TiF 6 and KBF 4 salts with molten alloy. The wear tests were conducted at normal loads of 19.6–78.4N and a sliding speed of 1ms −1 . A detailed SEM study of wear surface and...
Nano-hydroxyapatite reinforced poly(vinyl alcohol) gel (nano-HA/PVA gel) composite has been proposed as a promising biomaterial, especially used as an articular cartilage repair biomaterial. In this paper, nano-HA/PVA gel composite was prepared by in situ synthesis method and incorporation with freeze–thaw cycle process. The effects of various factors on the friction coefficient of the gel composites...
This paper investigates the scratch and normal hardness characteristics of polyamide 6/nano-clay composite. It is found that the weight percentage (wt%) of nano-clay greatly affects the scratch properties of the composite because of the intercalated structure of the nano-clay in the composite for higher clay loading. The scratch hardness, computed using the scratch width data, decreases while the...
After a 1min cavitation experiment performed in an ultrasonic vibration system, needle-like erosion pits appeared on a polished stainless steel surface, and a special ring area was formed around each pit. The shape of the pit and the plastic deformation of the ring area indicate that the mechanical impaction on the surface is the main reason for the cavitation erosion. On the other hand, the iridescent...
Work efficiency is considered as most concerned target in abrasive flow machining (AFM). It has many influence factors, such as, temperature, media viscosity, abrasive hardness, particles sharpness and density, workpiece hardness, pressure, piston moving speed, etc. The influence of temperature on work efficiency is most critical. In this investigation, both commercial AFM equipment and test rig are...
In this paper, numerical integration schemes and parallel computation methodologies for wear occurring in bodies that experience oscillatory contact are proposed. The methodologies build upon a widely used iterative wear prediction procedure in which the contact pressure and the incremental sliding distance are calculated using nonlinear finite element analysis, and the geometry of the contact interface...
The friction-induced temperature rise at the interface of two sliding bodies can cause a number of effects, including yield strength reduction, accelerated oxidation wear and thermoelastic instability, all of which may lead to degradation of performance or even the failure of the associated components. It is of interest, therefore, to accurately determine the temperature field resulting from sliding...
A 3D analytical solution is proposed in this paper to determine the temperature and the partition coefficient of heat flux generated by friction in a pin-on-disc tribometer. This solution is valid without restriction on the rotational velocity of the disc. It is given under an explicit form, thus avoiding any iterative calculation. A validation is performed by comparing the results with those available...
The friction and wear properties of short carbon fibers (SCFs) reinforced aluminum matrix composite were studied. The influences of the fiber volume fraction, load applied, rotating speed, and wear mechanism were discussed. The results indicated that SCFs/Al composite had better tribological properties than Al alloy. The friction coefficient and wear mass loss decreased with the fiber volume fraction...
The present work provides an insight into the dry sliding wear behavior of titanium based on synergy between tribo-oxidation and strain rate response. Pin-on-disc tribometer was used to characterize the friction and wear behavior of titanium pin in sliding contact with polycrystalline alumina disk under ambient and vacuum condition. The sliding speed was varied from 0.01 to 1.4ms −1 , normal...
The material removal rate in CMP processes obeys Preston's equation, which can be expressed as a linear function of the applied areal power density under usual operating conditions. However, some experimental results have shown a nonlinear relationship between the CMP material removal rate and the applied areal power density, suggesting non-Prestonian behavior under certain operating regimes. Although...
Fretting corrosion damages are commonly observed when two metallic bodies, which are in contact with each other, are subjected to oscillatory motions of low amplitude. Such kind of degradation mode is often responsible for limited durability of aeronautical joints. In the present paper, a multifunctional duplex coating based on Si–C–N and diamond-like carbon (DLC) materials, combining corrosion resistance...
In the present work, epoxy based composites filled with hybrid nano-SiO 2 particles and short pitch based carbon fiber were prepared. Copolymer of styrene and maleic anhydride was grafted onto the nanoparticles prior to the compounding so that the nanoparticles can be covalently connected to the composites’ matrix through the reaction between anhydride and epoxide groups during curing. Consequently,...
This study deals with the mechanical characterization of three types of obsidian with scratch tests. These obsidians have been selected for their archeological interest and, in particular, they have been taken in three different sites in Turkey: Bingöl, Nenezi Dag and Kayirli.Known as being brittle, the mechanical analysis of such material requires a special attention. The porosity is measured by...
The aim of this work was to test a new PTFE impregnated cloth material for use as a surface layer on the pistons of a hydraulic motor at the interface with the cam roller. Tests were carried out using a standard Bowden & Leben sliding friction tester which indicated that the cloth material gave similar results to the current material (PTFE impregnated sintered bronze) in both dry and lubricated...
PEEK (poly-ether-ether-ketone) is a high performance engineering semicrystalline thermoplastic. PEEK has excellent tribological behaviour, which is optimised in the specially formulated tribological composite grade.This paper presents a comparative study of wear and friction on PEEK, PEEK-CF30 (wt%) and PEEK-GF30 (wt%) against steel, at long dry sliding. A plan of experiments was performed on a pin-on-disc...
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