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Research Papers: Friction and Wear

Improvement in Microscratch 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
e-mail: amanov_a@yahoo.com

Bakhtiyor Urmanov

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

Ki-Chol Kim

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

Young-Sik Pyun

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

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 4, 2017; final manuscript received April 18, 2017; published online July 21, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 140(1), 011602 (Jul 21, 2017) (6 pages) Paper No: TRIB-17-1004; doi: 10.1115/1.4036721 History: Received January 04, 2017; Revised April 18, 2017

This paper deals with the improvement in surface properties and microscratch 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 microhardness tester, respectively. The scratch resistance was assessed using a microscratch 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 three-dimensional (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.

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References

Figures

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Fig. 1

SEM images of the as-received and UNSM-treated Mersen (a) and (b) and Poco (c) and (d) graphites

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Fig. 2

Comparison in surface roughness and surface hardness of the as-received and UNSM-treated Mersen and Poco graphites

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Fig. 3

Raman spectrum of the as-received and UNSM-treated Mersen (a) and Poco (b) graphites showing the reduction in intensity after UNSM treatment

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Fig. 4

Comparison in friction behavior of the as-received and UNSM-treated Mersen (a) and Poco (b) graphites showing the reduction in friction coefficient after UNSM treatment

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Fig. 5

3D LSM images of scratch grooves generated on the as-received and UNSM-treated Mersen (a) and (b) and Poco (c) and (d) graphites

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Fig. 6

Cross-sectional profiles of scratch grooves generated on the as-received and UNSM-treated Mersen and Poco graphites

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Fig. 7

Comparison in wear volume of scratch grooves generated on the as-received and UNSM-treated Mersen and Poco graphites

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