friction and surface fracture of SiC-final.pdf (2.76 MB)
Friction and surface fracture of a silicon carbide ceramic brake disc tested against a steel pad
journal contribution
posted on 2015-09-03, 10:57 authored by Guangyu Bian, Houzheng WuFriction 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.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
Journal of the European Ceramic SocietyVolume
35Issue
14Pages
3797 - 3807Citation
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.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
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.2015.07.009ISSN
0955-2219eISSN
1873-619XPublisher version
Language
- en