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Research Papers: Friction and Wear

Wear Behavior of Pure Titanium Coated With WC-Co by the Use of Electrospark Deposition Method

[+] Author and Article Information
Seyyed Jaber Razavi Arab

Department of Materials Engineering,
University of Tabriz,
Tabriz 5166616471, Iran

Hossein Aghajani

Department of Materials Engineering,
University of Tabriz,
Tabriz 5166616471, Iran
e-mail: h_aghajani@tabrizu.ac.ir

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received August 21, 2018; final manuscript received February 23, 2019; published online March 20, 2019. Assoc. Editor: Gary L. Doll.

J. Tribol 141(5), 051605 (Mar 20, 2019) (7 pages) Paper No: TRIB-18-1338; doi: 10.1115/1.4043065 History: Received August 21, 2018; Accepted February 23, 2019

Titanium is a highly interesting material in engineering because of its unique combination of high strength to weight ratio, excellent resistance to corrosion, and biocompatibility. However, the material’s low wear resistance, which is its inherent nature, limits its application in highly erosive conditions. In order to enhance the wear resistance of biomedical grade titanium with the help of a WC-Co coating, an electrospark deposition method was used in this work. The goal of this work is to investigate the effect of frequency and current upper limit in the electrospark deposition process on substrate properties. Hardness of the layers was measured by a microhardness tester. In order to study the morphology and microstructure of surface layers, scanning electron microscope was used. Tribological tests were conducted under technically dry friction conditions at a load of 12.5 N by a pin-on-disk tribometer. Titanium was observed in coating and metallurgical bonding between the coating and the substrate. The optimized sample's hardness was about 930 HV 0.1. Results showed that the presence of a carbide layer on the surface of titanium leads to a great enhancement of wear resistance of about 68% in the pin-on-disk test.

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Figures

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Fig. 1

SEM images of the surface of WC92-Co8 coating on Ti-Cp with different pulse conditions

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Fig. 2

X-ray diffraction pattern of the WC92-Co8 coating on the Ti-Cp prepared in 10 kHz frequency and a 35 A current upper limit

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Fig. 3

Energy-dispersive X-ray spectroscopy of the ESD layer prepared in 10 kHz frequency and a 35 A current upper limit

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Fig. 4

Results of hardness tests for all of the samples prepared in various ESD conditions

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Fig. 5

The COF curve for the substrate (Ti-Cp)

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Fig. 6

COF curves for the coated samples

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Fig. 7

Morphology of the working surface of the substrate (Ti-Cp) after tribological tests

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Fig. 8

Morphology of the working surface of the coated samples after wear tests

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Fig. 9

Mass loss of the substrate and the coated samples

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Fig. 10

Mass loss versus frequency at constant current upper limits for the coated samples

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Fig. 11

Higher magnification of the working surface of samples marked in Fig. 9

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