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Title: Friction and surface fracture of a silicon carbide ceramic brake disc tested against a steel pad
Authors: Bian, Guangyu
Wu, Houzheng
Keywords: SiC
Friction
Surface fracture
Contact
Speed
Issue Date: 2015
Publisher: © Elsevier
Citation: BIAN, G. and WU, H., 2015. Friction and surface fracture of a silicon carbide ceramic brake disc tested against a steel pad. Journal of the European Ceramic Society, 35(14), pp.3797-3807.
Abstract: Friction coefficients of a SiC ceramic disc were measured on a laboratory-scale dynamometer by testing against a mild steel pad under different initial braking speeds, and its friction surface was investigated with microscopy techniques. At bedding, averaged friction coefficient for a braking stop varied significantly with the initial braking speed; after bedding, it converged to ~0.6, regardless of braking speed. Surface fracture on the SiC disc was responsible for the transformation from a flat surface into a rough one, making ploughing a dominant friction mechanism at bedded stage. It was found that fracture surface and non-contact regions directly contributed friction coefficient variation at bedding stage. Friction layer composed of iron oxides and plastic deformation with partial dislocations activated appeared on SiC surface, but were unsustainable owing to surface fracture. A quantitative analysis is provided to understand friction coefficient variation and SiC surface fracture during braking.
Description: This paper was accepted for publication in the journal Journal of the European Ceramic Society and the definitive published version is available at http://dx.doi.org/10.1016/j.jeurceramsoc.2015.07.009
Version: Accepted for publication
DOI: 10.1016/j.jeurceramsoc.2015.07.009
URI: https://dspace.lboro.ac.uk/2134/18602
Publisher Link: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.07.009
ISSN: 0955-2219
Appears in Collections:Published Articles (Materials)

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