Emission and Transport of Wear Particles

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 30 September 2024 | Viewed by 2615

Special Issue Editors


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Guest Editor
Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, 80-233 Gdansk, Poland
Interests: airborne wear particle emissions; heat conduction friction problems; sliding contact temperature measurements

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Guest Editor
Department of Mechanical Engineering Sciences, Lund University, SE-221 00 Lund, Sweden
Interests: tribology; metal; coating; microstructure; railway

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Guest Editor
Environmental Research Division, Japan Automobile Research Institute, 2530 Karima, Tsukuba, Ibaraki, Japan
Interests: brake wear particle measurements; aerosol chemistry; mass spectrometry

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Guest Editor
Material Development, GCF Research & Development, Brembo S.p.A., 24040 Stezzano, BG, Italy
Interests: disc brake emissions; brake wear particle characterization; friction materials

Special Issue Information

Dear Colleagues,

The problem of environmental pollution is becoming increasingly important in view of the growing ecological footprint of humankind. Friction contact, mainly through transport vehicle brakes, tire-on-road contact, wheel-on-rail contact, and electrical sliding contact, represents a significant source of toxic particulate matter pollution to the atmosphere, ground, and water. This source may be critically harmful in urban areas, especially in closed and semi-closed environments, such as traffic tunnels, stations, and stops.

The generation, emission, and transport of wear particles are complex processes involving various interrelated mechanical, thermal, electrical, and chemical phenomena. Their investigation requires a systematic approach based on the application of different techniques and principles of tribology, mechanics, heat and mass transfer, aerosol science, electromagnetism, chemistry, etc. Studies focusing on the reduction of wear particle emissions as well as those investigating the underlying mechanisms are undoubtedly of great practical and scientific interest as the implementation of the results obtained in these studies may potentially contribute to achieving global sustainable development goals.

This Special Issue aims to promote advances in wear particle generation and emissions. The scope includes topics related to the generation, emission, and transport of wear particles from different sources, including the tribological aspects of particle formation, quantitative and qualitative assessments of particle emissions, and chemicophysical particle characterisation using various measurement techniques and instrumentation. Experimental, computational, and mixed studies at varied scales are appropriate for this Special Issue.

Dr. Oleksii Nosko
Dr. Yezhe Lyu
Dr. Hiroyuki Hagino
Dr. Mara Leonardi
Guest Editors

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Keywords

  • wear mechanism
  • wear debris
  • airborne wear particles
  • wear particle transport
  • wear particle characterisation

Published Papers (2 papers)

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Research

15 pages, 11591 KiB  
Article
Tribological Behavior of Friction Materials Containing Aluminum Anodizing Waste Obtained by Different Industrial Drying Processes
by Giovanni Straffelini, Priyadarshini Jayashree, Andrea Barbieri and Roberto Masciocchi
Lubricants 2024, 12(5), 173; https://doi.org/10.3390/lubricants12050173 - 11 May 2024
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Abstract
With sustainability dominating the industry, recycling the generated waste from different processes is becoming increasingly important. This study focuses on recycling waste generated during aluminum anodizing waste (AAW) in friction material formulations for automotive braking applications. However, before utilization, the waste needs to [...] Read more.
With sustainability dominating the industry, recycling the generated waste from different processes is becoming increasingly important. This study focuses on recycling waste generated during aluminum anodizing waste (AAW) in friction material formulations for automotive braking applications. However, before utilization, the waste needs to be pre-treated, which mainly involves drying. Hence, four different industrial drying methods were studied to dry the AAW, and the corresponding characteristics were observed by evaluating its residual humidity and crushability index. The waste powders were further characterized using FT-IR and SEM/EDXS to understand their constituents. The initial analysis showed that the waste subjected to the drying process P2 and P1 with the lowest final humidity fetched the most desirable results, with P1 having the simpler drying procedure. The AAW powders were added in a commercial friction material formulation at 6 and 12 wt.% and subjected to friction, wear, and non-exhaust particulate matter analysis. The worn surfaces were analyzed using SEM/EDXS evaluation to understand the extension and composition of the deposited secondary contact plateaus. It was seen that the 12 wt.% addition of waste processed using the P1 technique provided the most satisfactory friction, wear, and emission characteristics, along with expansive secondary contact plateaus with a good contribution of the waste in its formation. This study showed a good relationship between the processing method and a formulation’s tribological and emission characteristics, thereby paving the way for using this drying method for other waste requiring pre-treatment. Full article
(This article belongs to the Special Issue Emission and Transport of Wear Particles)
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14 pages, 4805 KiB  
Article
Dynamometric Investigation on Airborne Particulate Matter from Automobile Brake: Impact of Disc Materials on Brake Emission Factor
by Mu Hyeok Jeong, Won Cheol Shin, Yoon-Suk Oh, Jungju Lee, Seung Hun Huh, Jae-Hwan Pee, Hyungjo Seo, Ho Jang and Jong-Young Kim
Lubricants 2023, 11(12), 526; https://doi.org/10.3390/lubricants11120526 - 11 Dec 2023
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Abstract
In this work, we evaluated the impact of disc rotors of gray cast iron (GCI), nitrocarburized (NC), and superhard ceramic-coated (SCC) GCI on the brake wear PM emissions of passenger vehicles using dynamometric measurements. The brake emission factor (BEF) of the SCC was [...] Read more.
In this work, we evaluated the impact of disc rotors of gray cast iron (GCI), nitrocarburized (NC), and superhard ceramic-coated (SCC) GCI on the brake wear PM emissions of passenger vehicles using dynamometric measurements. The brake emission factor (BEF) of the SCC was greatly reduced by more than a factor of 1/5 compared with those for the GCI and NC for both low-steel and non-steel friction materials. Surface topological and microstructural analyses confirmed that more severe wear was pronounced for the NC rotor compared with the SCC, as evidenced by large concave pits in the wear tracks. Analysis of the size-classified airborne PM suggests that reduced micron-sized particles, which originated from the GCI disc, were responsible for the lower BEF due to the increased hardness of the SCC. Full article
(This article belongs to the Special Issue Emission and Transport of Wear Particles)
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