Microstructure and tribological behaviour of alumina composites reinforced with SiC-graphene core-shell nanoparticles

Authors

Jiangshan Zhang, University of WollongongFollow
Shufeng Yang, University of Science And Technology Beijing
Zhixin Chen, University of WollongongFollow
Monika Wyszomirska, University of WollongongFollow
Jingwei Zhao, University of WollongongFollow
Zhengyi Jiang, University of WollongongFollow

RIS ID

131421

Publication Details

Zhang, J., Yang, S., Chen, Z., Wyszomirska, M., Zhao, J. & Jiang, Z. (2019). Microstructure and tribological behaviour of alumina composites reinforced with SiC-graphene core-shell nanoparticles. Tribology International, 131 94-101.

Abstract

SiC-graphene nanosheets (GNSs) core-shell nanoparticles were incorporated into alumina matrix composites. The composites showed refined grain sizes, increased toughness and hardness. Ball-on-disk wear tests were conducted and the results demonstrated that the coefficient of friction was reduced by 29.4%, and the wear rate was reduced by 90.1% for the composite containing 5 vol % SiC and 1 vol % GNSs at 90 N in comparison to monolithic alumina. These results are superior to Al2O3-graphene composites documented in the literature. The microstructure and topography of the wear scars were examined to understand the wear behaviour. GNSs-rich tribofilms were observed on the wear scar. The contributing mechanism of the self-lubricating and wear-resistance performance was explored.