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A pin-on-disc study on the tribology of cast iron, sinter and composite railway brake blocks at low temperatures
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0001-7560-6232
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-4447-3363
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-0696-7506
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
2019 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, p. 48-52Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2019. p. 48-52
Keywords [en]
Brake blocks, Composite, Pin-on-disc, Railway, Temperature, Tribology
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:kth:diva-246451DOI: 10.1016/j.wear.2019.01.110ISI: 000464582200006Scopus ID: 2-s2.0-85061381732OAI: oai:DiVA.org:kth-246451DiVA, id: diva2:1297610
Note

QC 20190320

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-05-14Bibliographically approved

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Lyu, YezheBergseth, EllenWahlström, JensOlofsson, Ulf

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Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

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