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Tribology and airborne particle emissions from grey cast iron and WC reinforced laser cladded brake discs

Lyu, Yezhe LU orcid ; Varriale, Francesco LU ; Malmborg, Vilhelm LU orcid ; Ek, Martin LU orcid ; Pagels, Joakim LU and Wahlström, Jens LU orcid (2024) In Wear 556-557.
Abstract

Laser cladding (LC) is a promising technique to overlay a protective coating on grey cast iron (GCI) brake discs to enhance the wear and corrosion resistance. This study utilized a pin-on-disc tribometer in an aerosol chamber to investigate the tribology and airborne particle emissions from tungsten carbides (WC) reinforced coating overlayed onto GCI substrate through laser cladding. Uncoated GCI brake discs served as reference material, while low-metallic (LM) and non-asbestos organic (NAO) brake pads were used as counterparts. The results indicate that LC coating exhibited slightly higher coefficient of friction and significantly lower wear than uncoated GCI discs. Abrasive wear is the dominant wear mechanism for both uncoated GCI... (More)

Laser cladding (LC) is a promising technique to overlay a protective coating on grey cast iron (GCI) brake discs to enhance the wear and corrosion resistance. This study utilized a pin-on-disc tribometer in an aerosol chamber to investigate the tribology and airborne particle emissions from tungsten carbides (WC) reinforced coating overlayed onto GCI substrate through laser cladding. Uncoated GCI brake discs served as reference material, while low-metallic (LM) and non-asbestos organic (NAO) brake pads were used as counterparts. The results indicate that LC coating exhibited slightly higher coefficient of friction and significantly lower wear than uncoated GCI discs. Abrasive wear is the dominant wear mechanism for both uncoated GCI brake discs and LC coatings. LC coatings substantially decreased the particle mass concentrations. All three friction pairs displayed a mass weighted size distribution with a major peak around 2–3 μm. The number size distribution was dominated by a mode below 1 μm. Emissions by number were generally low. Meanwhile, all three friction pairs emitted sheared off and agglomerated particles, with iron being the dominant element. Tungsten was identified in the particles emitted from LC coatings, indicating that the hard coating has a potential to wear off and become airborne particles.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Brake PM, Laser cladding, Pin-on-disc, Size distribution, Transmission electron microscope, Ultrafine particles
in
Wear
volume
556-557
article number
205512
publisher
Elsevier
external identifiers
  • scopus:85199960363
ISSN
0043-1648
DOI
10.1016/j.wear.2024.205512
language
English
LU publication?
yes
id
89749071-ec95-4053-8823-8a3b56a7e63b
date added to LUP
2024-08-26 14:15:31
date last changed
2024-08-26 14:16:49
@article{89749071-ec95-4053-8823-8a3b56a7e63b,
  abstract     = {{<p>Laser cladding (LC) is a promising technique to overlay a protective coating on grey cast iron (GCI) brake discs to enhance the wear and corrosion resistance. This study utilized a pin-on-disc tribometer in an aerosol chamber to investigate the tribology and airborne particle emissions from tungsten carbides (WC) reinforced coating overlayed onto GCI substrate through laser cladding. Uncoated GCI brake discs served as reference material, while low-metallic (LM) and non-asbestos organic (NAO) brake pads were used as counterparts. The results indicate that LC coating exhibited slightly higher coefficient of friction and significantly lower wear than uncoated GCI discs. Abrasive wear is the dominant wear mechanism for both uncoated GCI brake discs and LC coatings. LC coatings substantially decreased the particle mass concentrations. All three friction pairs displayed a mass weighted size distribution with a major peak around 2–3 μm. The number size distribution was dominated by a mode below 1 μm. Emissions by number were generally low. Meanwhile, all three friction pairs emitted sheared off and agglomerated particles, with iron being the dominant element. Tungsten was identified in the particles emitted from LC coatings, indicating that the hard coating has a potential to wear off and become airborne particles.</p>}},
  author       = {{Lyu, Yezhe and Varriale, Francesco and Malmborg, Vilhelm and Ek, Martin and Pagels, Joakim and Wahlström, Jens}},
  issn         = {{0043-1648}},
  keywords     = {{Brake PM; Laser cladding; Pin-on-disc; Size distribution; Transmission electron microscope; Ultrafine particles}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Wear}},
  title        = {{Tribology and airborne particle emissions from grey cast iron and WC reinforced laser cladded brake discs}},
  url          = {{http://dx.doi.org/10.1016/j.wear.2024.205512}},
  doi          = {{10.1016/j.wear.2024.205512}},
  volume       = {{556-557}},
  year         = {{2024}},
}