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Cavitation erosion behaviour of niobium was investigated by means of a 20kHz ultrasonic vibrator at peak-to-peak amplitude of 50μm, aiming to determine the niobium potential as a material for the manufacturing of hydraulic machine components. The study was emphasized for the three first cavitation stages of the cumulative erosion–time curve. The modification of the niobium surface morphology as a...
Oxidation treatment with concentrated HNO 3 was employed to the carbon fabric (CF) for various time intervals (30–180min) to observe the effect of treatment on two simultaneous processes involved viz. improvement in its adhesion with the matrix and reduction of fiber strength which in turn is responsible for change in the performance properties of composites. Seven composites with untreated...
Repeated impact by solid particles causes erosion and degradation of engineering components. In internal combustion engines, during combustion, hot gases are generated in large quantity which causes erosion of cylinder, combustion chamber, exhaust system, etc. In this work, two types of plasma sprayed coating systems were developed on Al-6061 substrate. For each system, a systematic microstructural...
An improved ball crater micro-abrasion test method has been developed that differs from the conventional ball crater method. A ball-on-three-disk (BOTD) configuration provides mechanical stability and three simultaneous measurements of abrasion. An inclined BOTD geometry allows the specimens to be totally immersed in abrasive, which allows the use of dry abrasives as well as slurries and pastes. Use...
Some soil-burrowing animals and other biological organisms living in contact with abrasive materials have surfaces optimized for reducing drag and wear. In this study, bio-inspired embossed surfaces consisting of an array of convex domes are investigated to quantify their abrasive wear resistance properties. The experimental procedure proposed in this work is based on sliding seven different embossed...
Smoothed particle hydrodynamics (SPH) was used to simulate the impact of single angular particles on Al6061-T6 targets, and the implications for solid particle erosion were discussed. The results of the simulations were verified by comparison to measurements obtained from impact experiments performed using a gas gun which was specifically designed to accelerate angular particles without disturbing...
The friction and wear of short glass fiber reinforced polyamide 12 (PA12) were investigated. The behavior of the fibers on a sliding surface and their effect on the friction and wear were studied in terms of the amount and orientation of the fibers in the composite. Results showed that the friction level and wear resistance were strongly affected by the fiber content, and glass fiber patches produced...
Generally it is understood that friction is additively decomposed into an adhesion- and a deformation-related component, suggesting independence. Experimentally these components cannot be separated and only by combining experiments with simulations, a decoupled analysis is possible. We apply this hybrid experimental–numerical approach in the single-asperity scratch test, simplifying the friction geometry...
NiAl, NiAl–Cr–Mo alloy and NiAl matrix composites with addition of oxides (ZnO/CuO) were fabricated by powder metallurgy route. It was found that some new phases (such as NiZn 3 , Cu 0.81 Ni 0.19 and Al 2 O 3 ) are formed during the fabrication process due to a high-temperature solid state reaction. Tribological behavior was studied from room temperature to...
In this study, the erosion–corrosion performance of carbon steel was investigated in crude oil, reservoir water, and a mixture of both solutions at a range of applied potentials, velocities and impact angle. The application of such work is to upstream and downstream oilfield conditions, where the proportions of hydrocarbon and water may vary during the extraction process over time. Following exposure...
Various composite friction materials containing 40vol.% organic binder (phenolic resin plus styrene–butadiene–rubber (SBR)) with varying phenolic-resin/SBR ratio were prepared. The content of phenolic resin in each composite was indicated by the resin value (RV) index ranging between 0 and 100%. The composites with RVs greater than 50% form resin-based friction materials in which the primary binder...
In the field of railway simulation, it is a general assumption to consider the coefficient of friction as a known and constant value. This hypothesis is clearly not correct as friction is a consequence of the operating conditions (an output, not an input) and many factors can cause friction coefficient to change.In this paper, numerical algorithms based on the simplified theory of Kalker (Fastsim)...
In sheet metal stamping, it is known that wear is unevenly distributed over the die radius and that multiple wear mechanisms may occur simultaneously. However, there has been little or no work that details the types of wear mechanisms, and quantifies the locations at which they occur. Furthermore, the link between recently identified time-dependent contact conditions and the wear response is currently...
The friction behavior of CuO/yttria-stabilized tetragonal zirconia (3Y-TZP) composite in dry sliding against alumina at room temperature has been investigated. The results show that an alumina counterface has a crucial role on the frictional behavior when sliding against CuO/3Y-TZP composite in comparison with other counter materials. Pure 3Y-TZP shows high friction and wear under the same conditions...
Ductile iron (DI) or spheroidal graphite cast iron is an attractive ferrous material being widely used due to its combination of low cost and good combination of strength, toughness and fatigue endurance. However, under severe service conditions, experienced in seashore, earth-moving and mining applications the performance and reliability of DI are limited due to its poor wear resistance. Wear resistance...
The effect of a strain-induced martensitic transformation on the cavitation erosion resistance and incubation time of Fe–10Cr–10Ni–xC (x=0.3, 0.4, 0.5, and 0.6wt%) austenitic steels has been studied. As the carbon concentration increased, mass loss in the alloys also increased, while the incubation period and the amount of transformed martensite decreased. In addition, the martensite volume fraction...
The friction of a copper surface, which is exposed to diethyl disulfide (DEDS), dimethyl disulfide (DMDS) or dimethyl trisulfide (DMTS) while rubbing by a tungsten carbide pin, are explored in an ultrahigh vacuum tribometer to investigate the effect of the sulfur-to-carbon stoichiometry on gas-phase lubrication. Surface analyses by Auger spectroscopy of the wear scars after rubbing reveal that the...
This paper reports on the optimization of (Ti,Si , Al)N x coatings to improve the performance of coated tools in dry cutting applications. The performance and the wear mechanisms of (Ti,Si , Al)N x tungsten carbide coated tools were investigated. Tool life and tool failure modes were thoroughly examined by scanning electron microscopy (SEM) complemented with energy...
This paper is a continuation of our work to characterize the tribo-corrosion behaviors of Ti 3 SiC 2 in common acids and alkalis [Ren et al. (2010) [1]]. Tribo-corrosion behaviors of Ti 3 SiC 2 /Si 3 N 4 in hydrochloric acid (HCl) and sodium hydroxide (NaOH) with different concentrations were investigated in the present paper. The worn surfaces of Ti...
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