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Characterization of ultrafine particles from hardfacing coated brake rotors
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- Lyu, Yezhe, 1987- (författare)
- KTH Royal Institute of Technology,Lund University,Lunds universitet,KTH,Maskinkonstruktion (Inst.),Department of Mechanical Engineering Sciences, Lund University, Lund, SE-22100, Sweden,Institutionen för maskinvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,LTH profilområde: Aerosoler,LTH profilområden,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Aerosols,LTH Profile areas,Faculty of Engineering, LTH
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- Sinha, A. (författare)
- University of Trento
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- Olofsson, Ulf, 1962- (författare)
- KTH Royal Institute of Technology,KTH,Maskinkonstruktion (Inst.)
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- KTH Maskinkonstruktion (Inst) (creator_code:org_t)
- 2022-04-30
- 2023
- Engelska.
- Ingår i: Friction. - : Tsinghua University. - 2223-7690 .- 2223-7704. ; 11:1, s. 125-140
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Automotive brake rotors are commonly made from gray cast iron (GCI). During usage, brake rotors are gradually worn off and periodically replaced. Currently, replaced brake rotors are mostly remelted to produce brand-new cast iron products, resulting in a relatively high energy consumption and carbon footprint into the environment. In addition, automotive brakes emit airborne particles. Some of the emitted particles are categorized as ultrafine, which are sized below 100 nm, leading to a series of health and environmental impacts. In this study, two surface treatment techniques are applied, i.e., high-velocity oxygen fuel (HVOF) and laser cladding (LC), to overlay wear-resistant coatings on conventional GCI brake rotors in order to refurbish the replaced GCI brake rotor and to avoid the remelting procedure. The two coating materials are evaluated in terms of their coefficient of friction (CoF), wear, and ultrafine particle emissions, by comparing them with a typical GCI brake rotor. The results show that the CoF of the HVOF disc is higher than those of the GCI and LC discs. Meanwhile, HVOF disc has the lowest wear rate but results in the highest wear rate on the mating brake pad material. The LC disc yields a similar wear rate as the GCI disc. The ultrafine particles from the GCI and LC discs appeared primarily in round, chunky, and flake shapes. The HVOF disc emits unique needle-shaped particles. In the ultrafine particle range, the GCI and HVOF discs generate particles that are primarily below 100 nm in the running-in period and 200 nm in the steady state. Meanwhile, the LC disc emitted particles that are primarily ∼200 nm in the entire test run.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Tribologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Tribology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Farkostteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)
Nyckelord
- brake
- high-velocity oxygen fuel
- laser cladding
- particle morphology
- particle size distribution
- ultrafine particle
- Brakes
- Carbon footprint
- Cast iron
- Coatings
- Energy utilization
- Environmental impact
- Friction
- Fuels
- Morphology
- Oxygen
- Particle size
- Surface treatment
- Wear of materials
- Wear resistance
- Automotive brake
- Brake rotors
- Coefficient of frictions
- Gray cast iron
- High energy consumption
- High velocity oxygen fuels
- Particle morphologies
- Particles-size distributions
- Wear-rate
- Particle size analysis
- brake
- high-velocity oxygen fuel
- laser cladding
- particle morphology
- particle size distribution
- ultrafine particle
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- Sinha, A.
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- Gialanella, S.
- Wahlström, Jens
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- TEKNIK OCH TEKNOLOGIER
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- Lunds universitet
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