High-entropy alloys (HEAs) have garnered considerable interest since their inception in 2004, owing to their remarkable properties, including exceptional high strength, low-temperature fracture toughness, good corrosion properties, and high-temperature resistance. HEAs represent an emerging class of materials, distinguished from other metal systems by their five-or-more-component composition, wherein the constituents are present in equiatomic or near-equiatomic proportions, thereby maximizing configurational entropy. Notably, the multi-phase structure and significant Cr or Al content in many HEAs contribute to their favorable tribological performances and high-temperature properties. Consequently, certain HEAs hold substantial promise for diverse industrial applications, particularly as anti-wear materials under high-temperature conditions.
Howerver, one of the primary challenges impeding the widespread industrial application of HEAs is their cost. Many existing HEAs consist of a signi
A novel approach was developed to examine coke abrasion resistance in-situ at temperatures of up to 950 °C and in a controlled gas atmosphere using rotational tribological testing. The originality of this approach lay in the ability to apply tribological testing to the porous coke surface at elevated temperatures under a controlled inert or CO2 reactive atmosphere. Coke wear characteristics were quantified via (i) the application of advanced microscopy and image analysis techniques, and (ii) analysis of the coefficient of friction (COF) during tribological testing. Two pilot oven cokes were examined in this study, which were generated from single coking coals of similar rank but different petrographic composition. The cokes tested showed a deterioration in abrasion resistance even at 400 °C, and this was accentuated at 950 °C. The COF and the severity of the wear as a function of temperature and gas atmosphere were markedly different between the two cokes. Coke C396 from a mid-to-lo
IMechE Annual Dinner 2023 imeche.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from imeche.org Daily Mail and Mail on Sunday newspapers.
Mechanical bearings and gearboxes like those used in electric vehicles and wind farms are often treated with lubricants to avoid friction and wear. However, these components might be under voltage. This would impair the effectiveness of the lubricants to such a degree that the tribological contacts are damaged. As part of the Lube.Life joint research project, researchers at the Fraunhofer Institute for Mechanics of Materials IWM have developed a virtual lubricant lab, which can be used to predict the effects of electrical fields on lubricant stability. As a result, customized formulations for new lubricants can be created.