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Effects of alumina in nonmetallic brake friction materials on friction performance

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Abstract

The effects of alumina (Al2O3) as an abrasive on brake friction performance and friction layers of nonmetallic brake friction materials were evaluated. Five experimental compositions containing from 0 to 14.6 vol% alumina were tested (Al2O3—0, 3.4, 5.6, 9.0, and 14.6 vol%). The experimental results indicated that alumina enhances friction coefficient and improves wear performance. The formation and development of friction layers were characterized using X-ray fluorescence spectrometry and scanning electron microscopy with energy dispersive X-ray analysis. Phenomena of baryte film and transferred iron-containing film formed on the friction surfaces were observed. Baryte films were detected on specimens containing from 0 to 5.6 vol% alumina. Iron-containing films were detected on surfaces of all alumina-containing specimens but not on the material without alumina. The role of abrasive in nonmetallic friction materials was studied in relation to formulation, friction performance, and friction surfaces.

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Acknowledgements

The authors acknowledge National Natural Science Foundation of China (50673012), Twaron Research Fund (Teijin Twaron GmbH, Germany, 2007), Programs of International Cooperation funded by Ministry of Education, Youth and Sports of Czech Republic 1P05ME741, and Ministry of Education, Youth and Sports of the Czech Republic (MSM 6198910016) for their financial supports.

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Authors and Affiliations

  1. Nanotechnology Centre, VSB-Technical University of Ostrava, 17. listopadu 15, 708 33, Ostrava-Poruba, Czech Republic

    Vladimír Tomášek & Gabriela Kratošová

  2. The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Box 82, Beijing, 100029, China

    Rongping Yun, Yanli Fan & Yafei Lu

Authors
  1. Vladimír Tomášek
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  2. Gabriela Kratošová
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  3. Rongping Yun
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  4. Yanli Fan
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  5. Yafei Lu
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Corresponding author

Correspondence to Gabriela Kratošová.

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Tomášek, V., Kratošová, G., Yun, R. et al. Effects of alumina in nonmetallic brake friction materials on friction performance. J Mater Sci 44, 266–273 (2009). https://doi.org/10.1007/s10853-008-3041-z

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  • DOI: https://doi.org/10.1007/s10853-008-3041-z

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