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Investigations into the tribological behavior of polycrystalline alumina ceramics often treat the materials as monolithic alumina materials. But in fact, high-alumina ceramics are available in a wide range of compositions, both in terms of alumina content and grain-boundary chemistry, and this variation in composition can have an important influence on the wear behavior of the material. In this study,...
In this study, the three-body abrasion resistance of AISI 1020 annealed steel samples coated with WC-12%Co coatings produced by the Jet Kote(R) thermal spray process was evaluated. The tests were performed using SiO 2 , Al 2 O 3 and SiC as abrasives and five levels of stress ranging from 0.10 to 0.60 MPa. By measuring the weight loss, the wear rate was evaluated after reaching...
Solid debris particles in a lubricant can become entrained into the contacts of ball bearings. The particles damage the bearing surfaces. This can lead to rolling contact fatigue failure or material loss by three body abrasion. This work concentrates on modelling the later process for brittle debris materials. A brittle particle is crushed in the inlet region and the fragments are entrained into the...
Hardness testing has often been used to give a guide to the abrasive wear resistance of materials since an approximately linear correlation between wear resistance and hardness has been observed for broadly similar materials. However, the abrasive wear behaviour of a range of thin hard coatings has been found to vary quite dramatically and no reliable correlation with hardness exists. Scratch testing...
Virgin surface sliding and repeated sliding tests were carried out for the pure metal pins and the hardened bearing steel (SUJ 2) pins against abrasive papers with CC100-CC1000 grains. The mean depth S p /b of micro-grooves, the ratio α b of the volume of removed as debris to the volume of micro-grooves and the mean surface slope angle θ were calculated from the profile curves measured...
In this paper, the plasma spray technique was used to deposit coatings with reconstituted nanostructured Al 2 O 3 /TiO 2 powders. The abrasive wear resistance of the ceramic coatings was evaluated using diamond abrasives. The result showed that the abrasive wear resistance of the coatings produced using the nanostructured Al 2 O 3 /TiO 2 powders is greatly...
A study of the friction and wear properties of isotropic, fiber reinforced, and bulk oriented ultra-high molecular weight polyethylene (UHMWPE) was conducted on a reciprocating wear tester. The tests were carried out with a cobalt-chromium alloy cylinder sliding against a flat sample of UHMWPE in bovine serum at 1.5 Hz for over a million cycles. In the fiber reinforced material, layers of woven UHMWPE...
Abrasive particles are present in many tribological systems. Although it is intuitively felt that the shape of abrasive particles is related to the wear damage they cause, so far there has been no parameter accurately describing the particle angularity. Such a parameter would be useful in wear models. Recently, new parameters relating the angularity of particles to their abrasivity have been developed...
Short E-glass fibre-reinforced polyester composites with and without filler have been studied for the low stress abrasive wear behaviour carried out using Rubber Wheel Abrasion Test (RWAT) apparatus. In the present investigation, angular silica sand particles of size ranging between 100-200 and 200-300 μm were used as dry and loose abrasives. The volume loss of the composite during three-body abrasion...
The normal contact forces in a vibratory finishing machine were measured and compared with the resulting changes in surface roughness and hardness of two aluminum alloys, AA1100-O and AA6061-T6. The principal variables were the media size, degree of lubrication and the duration of the vibratory finishing. The changes in hardness and roughness were found to depend mostly on the lubrication condition,...
The advantages of using wall friction instead of hardness to indicate likely relative wear rates are given consideration and discussed. The results of sliding abrasive wear tests on a variety of commercially available steels using two particulate solids are presented, together with the results of wall friction tests between the same steels and one of the particulate solids. Correlations found between...
The influence of the transferred particles on the abrasive paper on the wear rate of the hardened bearing steel (SUJ 2) has been studied using the analytical method, which assumed a conical and a frustum grain without, and with, a transferred particle, and the results compared with the trend of the experimental results. The analytical results revealed that the total cross-sectional area plowed by...
The influence of titanium additions up to 0.38% and heat treatment on the abrasion resistance of a commercial 15% Cr-3% Mo white cast iron were examined. The wear resistance of as-cast commercial alloy was improved about 30% by addition of 0.38% titanium after austenising at 1050 o C for 6h and quenching in air. Tempering of quenched alloys at 250 o C for 6h yielded a decrease in hardness...
An Al-Cu (2014 Al) alloy reinforced with 10vol.% Al 2 O 3 particles (size: 75-150μm), prepared by liquid metallurgy route, has been investigated under two-body (high stress) abrasive wear condition. The influence of varying load, abrasive size and sliding distance on the abrasive wear behaviour of the specimens was also studied. The base alloy prepared under similar condition has also...
TiC-base cermets are in advantage compared with WC-base hardmetals because of their lower friction coefficient and higher oxidation resistance. At the same time, the diversity of alloys based on TiC, wear and loading conditions contributes substantially to problems in material selection. Present research focuses on testing of TiC-based cermets of different composition in different wear conditions...
Diamond-like carbon (DLC) coatings of 0.7, 1.5 and 3.0μm thickness were deposited on the titanium-alloy Ti6Al4V by a direct current discharge using benzene as gaseous precursor. Scanning electron microscopy, Raman spectroscopy, atomic force microscopy were utilised for gaining information about the micro-structural features and the composition. Hardness measurements, scratch and simple abrasion wear...
The grinding surface in magnetic fluid grinding (MFG) was originally created by embedding initially loose grits into a metal grinding shaft. Developments have included replacing the magnetic fluid by a cheaper, viscous, non-magnetic fluid, and loose grit/metal shafts by pre-manufactured resin-bonded or electro-plated diamond grinding surfaces. This paper reports grinding rates and grinding ratios,...
The abrasive wear characteristics of polymer matrix composite materials reinforced with particles of ultra-high molecular weight polyethylene (UHMWPE) have been investigated. Granular ignimbrite (a hard mineral) was used as the abrasive. The effect of varying the volume fraction of UHMWPE reinforcement upon wear rate has been measured and scanning electron microscopy (SEM) used to study the wear mechanisms...
A modified micro-scale abrasive wear test has been used to study the abrasivity of a range of silica and calcium carbonate abrasives in aqueous slurries, against polymethylmethacrylate (PMMA) samples. The method involves the rotation of a cylindrical disc against the specimen surface in the presence of small abrasive particles, and generates a wear scar with an imposed geometry. It allows a wider...
Granite grinding tests, under dry and wet conditions, were performed to assess the influence of abrasive particle size to the wear behavior of martensitic high-chromium white cast iron mill balls. The tests were performed, at first, using raw granite particle sizes between 0.074 and 19.1mm, and then with coarse and fine granite fractions obtained after screening the raw granite in a 3.36mm sieve....
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