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Observations made pertaining to the erosive wear characteristics of a cast zinc-based alloy and its composite containing 10wt.% (corresponding to 11.2vol.%) alumina particles have been presented in this study. Matrix alloy has also been tested under identical test conditions in order to examine the role played by second phase alumina particles on the erosive wear resistance of the matrix alloy. Eroded...
The microstructure and wear behavior of WC–8TiC–3TaC–8Co cemented carbide and CuZnNi alloy composite strengthening materials have been investigated by means of scanning electron microscopy (SEM), electron dispersion X-ray analysis (EDAX) and wear test. Effect of applied load and sliding distance on the wear behavior of the strengthening materials are also studied in this paper. The results show that...
The normal-angle erosion behavior of austempered ductile irons has been studied under various heat treatment parameters, including time and temperature for both austenitization and austempering process. The results indicate that the erosion rate was in generally positively related to hardness and tensile strength, and inversely proportional to percentage elongation and mechanical energy density. Un-dissolved...
Airfoils coated with columnar thermal barriers have been removed from aero-engines and characterized. Observations of deformation and cracking have been used to identify three material removal mechanisms. These are: (i) sub-surface, trans-columnar cracking attributed to the initial elasto-dynamic response (nanosecond timeframes), (ii) segmented cone cracks when the ensuing penetration (millisecond...
An experimental method was designed to evaluate wire coatings for the cold-heading process. Coatings are employed to increase material formability and to reduce wear on tooling. Typically, evaluation of frictional properties proves to be difficult because of problems instrumenting machine tooling and both the complexity and number of stages in the forming process. The proposed test is a cold extrusion...
The reactive plasma spraying (RPS) of titanium powders in a nitrogen containing plasma gas produces thick coatings characterised by microdispersed titanium nitride phases in a titanium matrix. In this paper, the wear resistance properties of Ti–TiN coatings deposited on carbon steel substrates by means of RPS technique are studied. Wear tests were performed in block-on-ring configuration and dry sliding...
Rare-earth (RE) (lanthanum-based) thin films were prepared on hydroxylated glass substrates by a self-assembling process from specially formulated solution. Atomic force microscope (AFM) and X-ray photoelectron spectrometry (XPS) and scanning electron microscope (SEM) are used to characterize the thin films. The tribological properties of the as-prepared thin films sliding against a steel ball were...
Past studies with PTFE nanocomposites showed up to 600× improvements in wear resistance over unfilled PTFE with the addition of Al 2 O 3 nanoparticles. Irregular shaped nanoparticles are used in this study to increase the mechanical entanglement of PTFE fibrils with the filler. The tribological properties of 1, 2, 5 and 10wt.% filled samples are evaluated under a normal pressure and...
Laser shock processing (LSP) is becoming an important surface treatment to induce a compressive residual stress field, which improves fatigue and fracture properties of components. In this work, we examine the effect of laser shock processing on the wear and friction behavior of 6061-T6 aluminum alloy. Wear rate and friction coefficient evolution are investigated for different process parameters of...
Amorphous SiCN ceramics were prepared in a laboratory scale as disk shaped specimens with 10mm diameter and 0.3mm thickness. The friction and wear behaviour was characterised in gross slip fretting tests under unlubricated conditions at room temperature against steel (100Cr6) and ceramic (Al 2 O 3 ). Tests with a ball-on-disk contact were performed in laboratory air with different...
The problem of a rigid sphere in normal contact with a thin, transversely isotropic elastic layer is investigated. The thin elastic layer rests on a rigid foundation and both the limiting cases, wherein the interface is either ideally bonded or unbonded and frictionless, are considered. Approximate analytical solutions for the contact pressure beneath the spherical indenter and for the contact patch...
This work has focused on the obtainment of Tribaloy T-800 coatings by laser cladding on plane 18/8 stainless steel specimens (AISI 304). The appropriate selection of cladding parameters allowed defect-free coatings to be obtained with minimal dilution. In order to evaluate their microstructure, cross-sections of the coatings were examined by optical microscopy and scanning electron microscopy (SEM)...
A series of ductile iron samples alloyed with 0.66% Cu, 1.02% Ni, and 0.26% Mo were austempered at 315 and 370°C for 5–240min and then tested for wear strength. A block-on-ring wear testing machine was used for this purpose. The wear samples were tested under a load of 45N and a displacement speed of 2.40m/s. The experimental outcome indicates that the wear properties of the austempered ductile iron...
The friction and wear behaviour of cermets/steel rubbing pairs were investigated. Friction and wear tests were carried out using three different crèmets on the base of tungsten, titanium and chromium carbides under dry sliding conditions against steel disk (0.45% C). Sliding wear tests were carried out using modified block-on-ring equipment at a sliding speed of 2.2m/s and normal load 40N.It is shown...
The influence of the alkyl chain length and of the anion on the lubricating ability has been studied for the room-temperature ionic liquids (IL) 1-n-alkyl-3-methylimidazolium X − [X=PF 6 ; n=6 (L-P106). X=BF 4 ; n=2 (L102), 6 (L106), 8 (L108). X=CF 3 SO 3 ; n=2 (L-T102). X=(4-CH3C6H4SO3); n=2 (L-To102)]. Neat IL have been used for AISI 52100 steel-ASTM 2011...
Experiments were carried out to investigate the effect of humidity on the wear behaviour of same metal combination, i.e. steel–steel and aluminium–aluminium. The sliding wear of steel was found to increase by nearly 1.5 orders of magnitude when the relative humidity (RH) of the surrounding air decreased from 80 to 28% RH. At low humidity, both delamination and adhesion wear occurred. At high humidity...
A composite coating of WC/Hadfield steel was fabricated through centrifugal casting process to improve the impact wear resistance of Hadfield steel under the conditions of low or medium impact energy. The interfacial structure between WC ceramic particle and the steel matrix was analyzed with scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD)...
In our pervious studies [Z. Zhang, C. Breidt, L. Chang, F. Haupert, K. Friedrich, Enhancement of the wear resistance of epoxy: short carbon fibre, graphite, PTFE and nano-TiO 2 , Composites A 35 (2004) 1385–1392; L. Chang, Z. Zhang, C. Breidt, K. Friedrich, Tribological properties of epoxy nanocomposites. I. Enhancement of the wear resistance by nano-TiO 2 particles, Wear 258 (1–4)...
The effects of normal load and the resulting scratch depth on scratch force profile, scratch hardness and the mechanisms of deformation and material removal for a number of industrially important polymers are studied. Upon scratching by a 30° angled conical tip, the mean tangential or scratch force is found to be linearly related to the normal load at lower speed (0.2mms −1 ); however, at...
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