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Previous studies in fretting fatigue have observed size effects related to contact width such that a critical contact width exists where there is drastic change in the fretting fatigue life. Several fatigue or fracture mechanics based concepts have been invoked to explain this interesting observation by previous researchers. The experiments conducted in the present study were similar in nature to...
The friction and wear characteristics of fibre-reinforced PEEK and PPS in water were studied using a face-contact sliding tester. The fibres used were glass and carbon fibres. Under boundary lubricating conditions, PEEK reinforced with glass fibre was little improved in friction and wear characteristics, since both PEEK and glass fibre had poor resistance to wear in water. In contrast, the addition...
In this study the tribological properties and surface characteristics of solid-lubricating coatings were investigated at low temperatures. Two types of coatings applied to 1045 steel and diesel engine cylinder bore samples were studied as solid-lubricants. Experimental results indicated that ion-plated Mo+ion-sulphuration duplex coating has lower friction and limited wear than that of ion-sulphuration...
Nickel-based and tungsten carbide (WC) composite coatings were prepared by laser cladding under different laser beam powers. The microscopic morphology and distribution of WC particles in a laser-clad Ni-WC coatings were characterized by scanning electron microscopy (SEM). Two effective methods to avoid the stress concentration and cracks were used. One is the gradient coating with WC hard phase varied...
This study demonstrates the application of the ring-on-ring test to investigate some of the important factors affecting the abrasive wear of rolling undercarriage components in track-type machines. The test involves the rolling contact between two steel rings and the systematic delivery of sand-sized third-body particles into the contact interface to induce abrasive wear. The wear factors addressed...
X-ray absorption near-edge structure (XANES) spectroscopy to monitor the chemical properties of tribochemical films generated from oil solutions comprised of two additives containing phosphorus and sulfur. Oil solutions containing diphenyl phosphate (DPP) or triphenyl phosphate (TPP), were blended with sulfurized ester (SE) and dithiocarbamate (DTC) extreme-pressure (EP) agents to generate tribochemical...
The effect of doping elements on the friction and wear properties of silicon carbide is investigated in unlubricated sliding under varying humidity conditions. Doping elements (Al, Mg and P) appreciably affect the friction coefficient at lower humidity (30% RH) than at higher humidity (60% RH). The change in the kinetics of tribochemical reactions at lower humidity is attributed to chemisorption and...
A rather new tool, the focused ion beam (FIB) technique, was used to characterise superficial layers at micro-contact areas of a commercial brake pad. The friction material was a polymer matrix composite (PMC) with approximately 50% metal content (semi-metallic) and the counter part was a cast iron rotor. Though the contact areas were not visible as topographic features, they could be identified with...
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