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The effect of reaction temperature on the formation of a carbon layer on the surface of SiC has been investigated. Subsequently, the tribological properties of the formed carbon layers were studied. The experimental procedure involved exposing reaction-bonded SiC balls to a flowing gas mixture of 5% Cl 2 , 2.5% H 2 , and Ar at a high temperature of 800, 1000, or 1200°C. A ball-on disk...
Thermoelastic instability (TEI) is investigated focusing on the effect of functionally graded materials (FGM) where the FGM half plane slides against a homogeneous conducting or rigid non-conducting body at speed V. Results confirm analytically that there is maximum critical speeds occurring at a certain value of non-homogeneous parameter of FGM within a range of thermal conductivity, which was reported...
The wear behaviour of textured silicon nitride (Si 3 N 4 ) ceramics with aligned microstructures was analyzed under abrasive wear conditions. Dry reciprocating self-mated ball-on-flat wear tests were performed to study the influence of different microstructural plane/orientation combinations on the Si 3 N 4 tribological behaviour. Textured materials showed superior...
The frictional response of a multi-component phenolic-based friction material is highly complex under a set of variable loads and speeds. The present paper discusses the sensitivity of friction coefficient (μ) of friction composites containing synthetic graphite with different particle sizes (with similar crystallinity range) to braking pressure and sliding speed. The friction studies were carried...
The tribological behaviour of mechanically alloyed (MA) aluminium-base materials reinforced by 2vol.% NiAl 3 , either as large lamellae (MA Al–Ni S) or as homogeneously dispersed rounded particles (MA Al–Ni S2) has been studied. The results are compared with that of nickel-free MA aluminium (MA Al S), taken as reference. All materials were prepared by mechanical milling of Al powder, eventually...
To improve cold rolling processes, it is necessary to understand and to optimise contact at roll–strip interface. Thus a simulation test has been developed in our laboratory. The upsetting rolling test (URT) enables to study friction and iron fines pollution by the reproduction of the main industrial contact conditions such as plastic strain, normal and tangential stresses and forward slip. On the...
Diamond-like carbon (DLC) coatings have became accepted non-ferrous coatings for automotive tribo-components as they offer excellent tribological properties resulting in improved fuel economy and reduced dependence on existing lubricant additives which can be harmful to catalytic converters and ultimately to the environment. Obtaining optimum durability (wear) as well as high fuel economy (low friction)...
In this paper the corrosion and tribocorrosion behaviour of a traditional metallic biomaterial (Ti6Al4V) and a Si 3 N 4 /TiN (SN/TiN) ceramic composite are studied and compared during exposures to 1% NaCl and 1% NaCl+1% lactic acid solutions.Electrochemical impedance spectroscopy (EIS) data collected on Ti6Al4V in both neutral and acidic solution have been interpreted on the basis...
In cavitation erosion, stress waves will be generated and propagated in the solid when a collapse impingement is acted on it. The cavitation damages on the solid surface are considered to be under the effect of the stress waves. An ultrasonic vibration cavitation erosion experiment was performed on a polished steel specimen, and not only the plastic deformations but also the brittle fractures appeared...
Laminated ceramic nozzles (GN1, GN2, and GN3) with different architecture and composition at the constituent layers were produced by hot pressing. The mechanical properties of the constituent layers of the laminated materials were measured, the microstructure was examined. The wear behaviors of these laminated nozzles were investigated and compared with an unstressed reference nozzle (CN). Results...
The resistance to fretting wear is one of the most important parameters of fuel assembly behavior in the reactor. To choose and optimize the designs with regards to this aspect, it is necessary to carry out lots of model tests. This paper describes the results of some of them carried out to determine the fuel rod fretting behavior for different support conditions. The tests were carried out in a special...
Exploration of the benefit of cryotreatment for achieving improvement in wear resistance of die/tool steel is a topic of current research interest. A series of wear tests has been carried out on AISI D2 steel samples subjected to cryotreatment at 77K for different durations. The wear rates at different loads and sliding velocities, morphologies of the worn-out surfaces and the characteristics of the...
The friction and wear of non-modified and electron beam modified polytetrafluoroethylene (PTFE) filled ethylene–propylene–diene–monomer (EPDM) rubber investigated with the help of pin on disk tribometer showed different behaviour during the sliding contact with hard spherical steel-ball. The friction coefficient (μ) and specific wear rate (k) of modified PTFE filled EPDM increased with an absorbed...
High-power piezo-electric motors with power densities of 1.4kW/kg display a potential for substituting hydraulic actuators. For this application, two novel tribometers of the same type have been designed using commercially available components for sliding motion at 40kHz with amplitudes between 2.5μm and 5μm. The tribometers are equipped with means to measure amplitude, frequency, power required to...
Solid particle erosion behavior of polyphenylene sulfide, reinforced by short glass fibers with varying fiber content (0–40wt%) has been studied. Steady-state erosion rates have been evaluated at different impact angles (15–90°) and impact velocities (25–66m/s) using silica sand particles (200±50μm) as an erodent. PPS and its composites exhibited maximum erosion rate at 30° impact angle indicating...
Spherical and irregular microparticles both in the size of 5μm were put into the de-ionized water respectively to form different suspensions, and vibrating cavitation experiments were performed in the two kinds of suspensions. After the experiment, the damages on the specimen surfaces were measured and free radicals in suspensions were detected. It was found that suspensions with particles cause more...
This paper describes an attempt to enhance the wear properties of hypereutectic cast aluminium–silicon alloys produced by semi-solid metal (SSM) processing technique. The rheological experiments on SSM slurries were performed under continuous cooling condition from liquidus temperature. Wear characteristics of alloy under investigation were studied using pin on flat wear system over a range of normal...
Two non-phosphorus and ashless 1,3,4-thiadiazole-2-thione derivatives, 5-dodecyldithio-3-phenly-1,3,4-thiadiazole-2-thione (DPTT) and 5-cetyldithio-3-phenyl-1,3,4-thiadiazole-2-thione (DHTT), were synthesized and their tribological behaviors as additives in rapeseed oil (RSO) were evaluated using a four-ball friction and wear tester. Their thermal stabilities and anticorrosive properties were investigated...
A number of commercially available WC-Co-based cemented carbides with 6 up to 12wt.% Co were machined and surface finished by grinding as well as by wire electrical discharge machining (EDM) in demineralised water through a number of consecutive gradually finer EDM regimes. Comparative dry reciprocating sliding wear experiments on both wire-EDM and ground samples against WC-Co pins were conducted,...
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