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Metallic components in sliding contact are sometimes subjected to high-loads with little or no lubrication. Such starved conditions can lead to a phenomenon called scuffing. Various definitions exist for this term, but in the present case, three criteria were used to signal its onset: changes in friction, vibrations, and noise, coupled with surface examination. On this basis, scuffing initiation was...
Recent tribological studies of AlMgB14-TiB2 nanocomposite coatings, sliding unidirectionally against AISI 52100 steel counterfaces under boundary-lubricated conditions, have shown sustained friction coefficient values as low as 0.02. While many industrial applications for wear-resistant coatings employ mineral oils as the lubricant, there is growing interest in the use of water-based, green alternatives...
This study was prompted by a desire to improve the wear resistance of power transmission components in rear axle drives on commercial farm tractors. Reciprocating wear tests were conducted under lubricated and non-lubricated conditions on three spheroidal cast irons which varied in strength and hardness (designated GGG450, GGG600, and GGG700). Hemispherically tipped steel pins (designated 42CrMoS4/41CrS4)...
The goal of this work was to rank, as quantitatively as possible, the high-temperature scuffing characteristics of a series of Co-based materials, including coatings, for possible use in wear-critical components like those in diesel engine exhaust systems and emission-controls. A cylinder pivoting on its side against a flat tile was used as the testing geometry. All tests were performed at 600°C in...
Nickel-based self-fluxing alloys (SFA) have been widely used as coatings in the light of their high levels of wear and corrosion resistance. However, their resistance to wear can be substantially improved by reinforcement with tungsten carbide–cobalt hardmetals. In this work, a range of coatings based on a nickel-based self-fluxing alloy has been produced by laser cladding. The coatings have been...
A type of C-Si-Mn nodular cast iron, used as grinding ball material, was studied. With 2.5-3.3 wt% C, 3.0-3.5 wt% Si and 2.0-2.5 wt% Mn, this type of nodular cast iron can be melted by cupola. Simple process, low cost, and high wear resistance make it more competitive as a ball material than other nodular cast irons. Heat treatment of this material was investigated at various quenching and tempering...
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