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The purpose of this study was to investigate the tribological characteristics of several Cu-based SiC particulate metal matrix composites (pMMCs) synthesized from copper-coated SiC particles. Pin-on-disk tests were done to compare the wear and friction properties of hemispherically tipped pMMC pins with those for grey cast iron machined from an automotive brake rotor. The sliding counterfaces in the...
Titanium nitride thin films, deposited by plasma vapor deposition (PVD) or chemical vapor deposition (CVD), are commonly used on metal cutting tools. The TiN coating increases cutting tool-life and extends the tool operating range. This paper examines the behavior of PVD TiN on high-speed steel (HSS) substrates under low stress abrasion. High-speed steel bars were coated with TiN by a cathodic arc...
Wear particles are produced whenever moving surfaces interact. The analysis of wear particles is now widely applied for non-intrusive examination of the condition of machinery, and can provide useful information for machine maintenance. There have been many attempts to automate the analysis of wear particles in recent years, as visual analysis is often time consuming, expensive and inconsistent. In...
The wear behaviour of cermet materials commercially available for cutting tool applications is investigated. Four insert types of diverse cermet compositions are used in dry face milling of steel AISI-SAE 1045 and in erosion tests under oblique and orthogonal impacting conditions. Results of the milling tests are discussed in terms of tool-life, flank and crater wear, and resistance to mechanical...
The International Wear of Materials (WoM) Conference series has experienced a colorful history of changes, from the struggles of its founders and the difficulties of finding suitable publishers for its papers, to the latest organizational experiment in coordinating with another major conference. In the face of minimal technical society support, steadfast efforts by the Steering Committee, enthusiastic...
The temperature and humidity are the most common and important parameters for the practical operation of magnetic tape. In order to develop fundamental understanding of the tribological properties of metal evaporated magnetic tape (MEMT) which is commonly used, microscratch tests of MEMT were carried out.The tests were carried out in an environmentally controlled chamber in which the temperature was...
Super-hard and low-friction diamond-like carbon (DLC) coatings deposited at low temperatures are currently of great interest for wear protection and friction reduction. However, their high hardness (50-80 GPa), intrinsic stresses, and poor adhesion limit their use to applications where contact pressures are below 1 GPa and the coating thickness is below 0.5 μm to prevent cracking and delamination...
The relationship between two significantly different surface grinding conditions and the reciprocating ball-on-flat friction and wear behavior of a high-quality, structural silicon nitride material (GS-44) was investigated. The slider materials were silicon nitride NBD 200 and 440C stainless steel. Two machining conditions were selected based on extensive machining and flexural strength test data...
Plasma-sprayed coatings are built up from individual overlapping solidified droplets, and the nature of boundaries between these splats influences their mechanical and wear characteristics. This work aims to elucidate the correlation between these characteristics and microstructural features of model coatings produced under well-controlled processing conditions. A series of coatings with different...
The Cu-15 vol.% Cr in situ composite is a promising material for the electrical contacts in high current devices, since it has an excellent combination of mechanical strength and electrical/thermal conductivity. The electrotribological behavior of Cu-15 vol.% Cr was studied using a modified pin-on-disk tester with an electrical current applied across the sliding interface. The Cu-15 vol.% Cr pins...
The wear of ultra high molecular weight polyethylene (UHMWPE) bearing components is of major concern in the context of the prolonged performance of total human joint replacements. Analysis of retrieved tibial components from knee prostheses shows that fatigue is the major cause of failure, but that wear is also often associated with abrasion mechanisms caused by bone cement and other debris entering...
Iron-base and nickel-base powders as well as several powders of different hard particles were tested by microscratching and microindentation up to 900°C. Those most suited were mixed and hot compacted to give new metal matrix composites (MMC). Up to 50 v/o of coarse WC/W 2 C particles were dispersed in a high speed steel matrix or in a NiCr20AlSi matrix. The wear rate in three-body sliding...
The initial wear in nanometer-scale contacts between Si 3 N 4 tips with 20 nm nominal radius and polystyrene surfaces was studied in air using a scanning force microscope. Polystyrene films had molecular weights (MW) 24 k and 210 k and were cast from toluene solution and dried in vacuum. Film thicknesses were greater than 0.5 μm to avoid film-substrate interfacial effects. The starting...
A series of elevated temperature erosion tests were carried out on cooled AISI 1018 low-carbon steel and four thermal spray-coated mild steel specimens using a nozzle-type elevated temperature erosion tester. The thermal-sprayed coatings included a high velocity oxy-fuel (HVOF) 75Cr 3 C 2 -25NiCr cermet coating, HVOF Cr 3 C 2 , low velocity flame-sprayed Cr 2 ...
A large class of tribological contacts involve two components, each carrying finite roughness, sliding over one another for many repeated cycles of operation. Although the initial contact may be plastic the steady state situation is one of elastic stress fields in each consistent with the presence of a low shear strength boundary film on one or both of the surfaces. In order to relate the overall...
High chromium white cast irons are used extensively in environments where small particle impact causes considerable damage. In this study, a white cast iron containing 26 wt% Cr, and with a carbide volume fraction of 0.28, is impacted with projectiles at normal incidence using a gas gun. Both crater diameter and the size of the damage zone are measured as a function of projectile velocity, and an...
The prediction of damage and wear of materials under repeated moving contacts requires first the determination of the Limit response in terms of stress and strain. The simulation necessary to calculate the limit response could be performed with classical finite elements and an incremental treatment of the loading history, resulting in lengthy and repeated calculations. For steady-state moving contacts,...
To make paper from wood raw materials, wood chips must be processed to turn them into individual fibers or fiber bundles. In mechanical pulping this is accomplished by introducing energy into the wood chip or fiber bundles as the wood chips are passed between a set of counter-rotating plates; these are up to 1.5 m in diameter and operate with a plate clearance on the order of 0.1 mm and plate peripheral...
In this work, an evaluation was made to prove the possibility of employing a neural net method for the classification of debris and monitoring of a lubricated contact pair. We trained a neural net to classify the severity of wear into two types from the morphological features of the wear debris. The following procedures were used. First, the shape of wear particles was characterized by Fourier descriptors...
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