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A pin-on-disc study on the tribology of cast iron, sinter and composite railway brake blocks at low temperatures

Lyu, Yezhe ; Bergseth, Ellen ; Wahlström, Jens LU and Olofsson, Ulf (2019) In Wear 424-425. p.48-52
Abstract

Most freight wagons in the EU use cast iron brake blocks. Cast iron brake blocks have a stable braking capability in different environmental conditions, but wear down the wheel tread quickly. Therefore, there is a need to understand the tribology of other brake block materials. A pin-on-disc tribometer placed in a temperature-controlled chamber is used to investigate the tribology of cast iron, sinter and composite railway brake blocks at low ambient temperatures. Pins made from different brake blocks are tested with discs made from steel wheels. Both friction coefficient and wear are evaluated at five different temperatures from + 10 to − 30 °C. The cast iron block demonstrated the greatest wear at − 10 and − 20 °C, due to the... (More)

Most freight wagons in the EU use cast iron brake blocks. Cast iron brake blocks have a stable braking capability in different environmental conditions, but wear down the wheel tread quickly. Therefore, there is a need to understand the tribology of other brake block materials. A pin-on-disc tribometer placed in a temperature-controlled chamber is used to investigate the tribology of cast iron, sinter and composite railway brake blocks at low ambient temperatures. Pins made from different brake blocks are tested with discs made from steel wheels. Both friction coefficient and wear are evaluated at five different temperatures from + 10 to − 30 °C. The cast iron block demonstrated the greatest wear at − 10 and − 20 °C, due to the ductile-to-brittle transition at low temperatures. The worn graphite from cast iron is likely to become a solid lubricant, reducing the friction at − 10 and − 20 °C. For the composite brake block, a gradual decrease in friction with decreasing temperature was found. The sinter brake block was not sensitive to changes in ambient temperature. The sliding speed in the current study is relatively low and further study at higher speed is suggested in order to evaluate the tribological performance of different brake blocks.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Brake blocks, Composite, Pin-on-disc, Railway, Temperature, Tribology
in
Wear
volume
424-425
pages
5 pages
publisher
Elsevier
external identifiers
  • scopus:85061381732
ISSN
0043-1648
DOI
10.1016/j.wear.2019.01.110
language
English
LU publication?
no
id
4a713c99-9ccd-43ab-83ee-3def0c69e5a3
date added to LUP
2020-04-14 12:36:28
date last changed
2020-12-29 01:06:44
@article{4a713c99-9ccd-43ab-83ee-3def0c69e5a3,
  abstract     = {<p>Most freight wagons in the EU use cast iron brake blocks. Cast iron brake blocks have a stable braking capability in different environmental conditions, but wear down the wheel tread quickly. Therefore, there is a need to understand the tribology of other brake block materials. A pin-on-disc tribometer placed in a temperature-controlled chamber is used to investigate the tribology of cast iron, sinter and composite railway brake blocks at low ambient temperatures. Pins made from different brake blocks are tested with discs made from steel wheels. Both friction coefficient and wear are evaluated at five different temperatures from + 10 to − 30 °C. The cast iron block demonstrated the greatest wear at − 10 and − 20 °C, due to the ductile-to-brittle transition at low temperatures. The worn graphite from cast iron is likely to become a solid lubricant, reducing the friction at − 10 and − 20 °C. For the composite brake block, a gradual decrease in friction with decreasing temperature was found. The sinter brake block was not sensitive to changes in ambient temperature. The sliding speed in the current study is relatively low and further study at higher speed is suggested in order to evaluate the tribological performance of different brake blocks.</p>},
  author       = {Lyu, Yezhe and Bergseth, Ellen and Wahlström, Jens and Olofsson, Ulf},
  issn         = {0043-1648},
  language     = {eng},
  month        = {04},
  pages        = {48--52},
  publisher    = {Elsevier},
  series       = {Wear},
  title        = {A pin-on-disc study on the tribology of cast iron, sinter and composite railway brake blocks at low temperatures},
  url          = {http://dx.doi.org/10.1016/j.wear.2019.01.110},
  doi          = {10.1016/j.wear.2019.01.110},
  volume       = {424-425},
  year         = {2019},
}