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A Study on Emission of Airborne Wear Particles from Car Brake Friction Pairs
Brembo S.p.A..ORCID iD: 0000-0003-3345-5469
2015 (English)In: SAE International Journal of Materials and Manufacturing, ISSN 1946-3979, Vol. 9, no 1, 11 p.147-157 p.Article in journal (Other academic) Published
Abstract [en]

The emission of airborne wear particles from friction material / cast iron pairs used in car brakes was investigated, paying special attention to the influence of temperature. Five low-metallic materials and one non-asbestos organic material were tested using a pin-on-disc machine. The machine was placed in a sealed chamber to allow airborne particle collection. The concentration and size distribution of 0.0056 to 10 μm particles were obtained by a fast mobility particle sizer and an optical particle sizer. The temperature was measured by a thermocouple installed in the disc. The experiments show that as the temperature increases from 100 to 300 °C the emission of ultrafine particles intensifies while that of coarse particles decreases. There is a critical temperature at which the ultrafine particle emission rate rises stepwise by 4 to 6 orders of magnitude. For the friction pairs investigated, the critical temperature was found to be between 165 and 190 °C. Below the critical temperature, fine particles outnumber coarse and ultrafine particles, although coarse particles make up the bulk of the particulate matter mass. The friction pairs differ in the ultrafine particle emission rate by 1 to 2 orders of magnitude. Above the critical temperature, ultrafine particles constitute almost 100% of the total particle number and their relative mass contribution can exceed 50%. Analysis of the particle size distributions revealed peaks at 0.19-0.29, 0.9 and 1.7 μm. Above the critical temperature, one more peak appears in the ultrafine particle range at 0.011-0.034 μm.

Place, publisher, year, edition, pages
SAE International , 2015. Vol. 9, no 1, 11 p.147-157 p.
National Category
Engineering and Technology
Research subject
Machine Design
Identifiers
URN: urn:nbn:se:kth:diva-208687DOI: 10.4271/2015-01-2665ISI: 000386445700018ScopusID: 2-s2.0-84975807242OAI: oai:DiVA.org:kth-208687DiVA: diva2:1107898
Conference
SAE Brake Colloquium 2015
Projects
REBRAKE - G.A. 324385
Note

QC 20170613

Available from: 2017-06-11 Created: 2017-06-11 Last updated: 2017-06-13Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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More styles
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