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research-article

Improvement in Micro-scratch Resistance of Graphite by Surface Modification for Molding Applications

[+] Author and Article Information
Auezhan Amanov

Mechanical Engineering Department, Sun Moon University 100, Kalsan-ri, Asan 31460, South Korea
amanov_a@yahoo.com

Bakhtiyor Urmanov

Mechanical Engineering Department, Sun Moon University 100, Kalsan-ri, Asan 31460, South Korea
bakhtiyor.urmanov@gmail.com

Ki-Chol Kim

Mechanical Engineering and ICT Convergence Department, Sun Moon University 100, Kalsan-ri, Asan 31460, South Korea
kkc84517657@daum.net

Young-Sik Pyun

Mechanical Engineering Department, Sun Moon University 100, Kalsan-ri, Asan 31460, South Korea
pyoun@sunmoon.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4036721 History: Received January 04, 2017; Revised April 18, 2017

Abstract

This paper deals with the improvement in surface properties and micro-scratch resistance of graphites by means of an ultrasonic nanocrystalline surface modification (UNSM) technique. The surface roughness and surface hardness of the untreated and UNSM-treated graphites were investigated using an atomic force microscopy (AFM) and a micro-hardness tester, respectively. The scratch resistance was assessed using a micro-scratch tester at a progressive load. Moreover, a Raman spectroscopy was employed to characterize the microstructure of graphites before and after UNSM treatment. The scratch test results revealed that the resistance to scratch of both UNSM-treated graphites was found to be better in comparison with the untreated graphites. The increase in scratch resistance of both UNSM-treated graphites may be mainly attributed to the reduced surface roughness and increased surface hardness by UNSM treatment. The graphite produced by Poco exhibited a higher resistance to scratch compared to that of the graphite produced by Mersen. The objective of this study is to extend the service life of 3D cover glass moldings made of graphite by the application of UNSM treatment through the understanding the effects of surface roughness and surface hardness on the scratch defect generation behavior during glass molding process.

Copyright (c) 2017 by ASME
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