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research-article

Tribological investigation of multi-layer graphene reinforced alumina ceramic nanocomposites

[+] Author and Article Information
Iftikhar Ahmad

Center of Excellence for Research in Engineering Materials, Deanship of Scientific Research, King Saud University, P.O. Box. 800, Riyadh-11421, Kingdom of Saudi Arabia
ifahmad@ksu.edu.sa

Saqib Anwar

Industrial Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia
sanwar@ksu.edu.sa

Fang Xu

Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham, Nottingham, NG7 2RD, UK
Fang.Xu@nottingham.ac.uk

Yanqiu Zhu

College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
Y.zhu@exeter.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041303 History: Received February 20, 2018; Revised August 16, 2018

Abstract

We investigated the wear resistance properties of high-frequency induction heat (HFIH) sintered alumina (Al2O3) ceramic nanocomposites containing various multi-layer graphene (MLG) concentrations. The tribology of the monolithic Al2O3 and nanocomposites samples was assessed against spherical ceramic (Si3N4) counter sliding partner at sliding loads ranging from 6 to 40 N using ball-on-disk wear test configuration. Compared with the monolithic Al2O3, the incorporation of 1.0 vol.% MLG reduced the friction coefficient by 25% and the wear rate by 65% in the MLG/Al2O3 nanocomposites tested under 40 N sliding load. Based on the mechanical properties, brittle index and microstructure the activewear mechanisms for the nanocomposites were analyzed. The MLG contributed to the nanocomposites tribology process, indirectly, by enhancing the mechanical properties and, directly, by reducing the friction between the counter sliding partners. The synergistic role of MLG thin triboflim and twirled MLG for improving the tribological performance of the nanocomposites is discussed.

Copyright (c) 2018 by ASME
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