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Research Papers: Friction & Wear

Influence of Carbon Nanotubes on Wear of Carbide/Cobalt Micropunch

[+] Author and Article Information
Kelvii Wei Guo

Department of Mechanical and
Biomedical Engineering,
City University of Hong Kong,
83 Tat Chee Avenue,
Kowloon Tong,
Kowloon, Hong Kong, China
e-mai: kelviiguo@yahoo.com

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 12, 2013; final manuscript received January 9, 2014; published online February 24, 2014. Assoc. Editor: Dae-Eun Kim.

J. Tribol 136(3), 031601 (Feb 24, 2014) (6 pages) Paper No: TRIB-13-1188; doi: 10.1115/1.4026504 History: Received September 12, 2013; Revised January 09, 2014

Carbon nanotubes (CNTs) coated on a tungsten carbide/cobalt (WC/Co) micropunch (150 μm in diameter) and their effect on the wear of micropunches were investigated. CNTs were synthesized by homemade method. After the punching test with Ti as the substrate, the effect of CNTs on the wear loss and the surface morphology of the micropunch had been studied by confocal laser, scanning electron microscopy (SEM), and digital balance. Results show the wear of a CNTs coated micropunch obviously decreases. Even in the severe wear period, the wear loss is less than that of a non-CNTs coated micropunch. Compared with the micropunch without CNTs coating, the promising results are due to the formation of a lubrication film at the contact region by rubbing of the CNT forest; CNTs produced adhere to the micropunch surface avoiding direct contact during the punching period and providing lubricant properties to the interface by virtue of their graphitic nature.

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Figures

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Fig. 1

Surface texture of micropunch

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Fig. 2

Equipment for CNTs synthesis

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Fig. 3

A micropunch with CNT coating

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Fig. 4

Synthesized CNTs coated on micropunch

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Fig. 5

TEM image of synthesized CNTs

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Fig. 6

Relationship between wear loss and punching numbers

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Fig. 7

Surface texture of the micropunch in various conditions: (a) initial surface texture of CNTs coated micropunch, (b) surface texture of CNTs coated micropunch in the initial stage, (c) surface texture of CNTs coated micropunch in the initial quasi-stable stage, (d) surface texture of CNTs coated micropunch in the quasi-stable stage, (e) surface texture of CNTs coated micropunch in the sever wear stage, and (f) surface texture of CNTs coated micropunch in the last sever wear stage

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Fig. 8

Profile of punched microhole measured by OLS3000

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Fig. 9

Relationship between diameter of punched microhole and punching number

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