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Research Papers: Coatings and Solid Lubricants

Tribological Behavior of Diamondlike Carbon Film-Deposited Ti6Al4V Alloy Swinging Against Ultrahigh Molecular Weight Polyethylene in Fetal Bovine Serum

[+] Author and Article Information
Linmin Xu

School of Mechatronic Engineering;School of Materials Science and Engineering,
China University of Mining and Technology,
Xuzhou 221116, China

Dekun Zhang

School of Materials Science and Engineering,
China University of Mining and Technology,
Xuzhou 221116, China
e-mail: dkzhang@cumt.edu.cn

Kai Chen, Xuehui Yang, Qingliang Wang, Jianwei Qi

School of Materials Science and Engineering,
China University of Mining and Technology,
Xuzhou 221116, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 28, 2015; final manuscript received June 20, 2016; published online October 10, 2016. Assoc. Editor: Min Zou.

J. Tribol 139(3), 031301 (Oct 10, 2016) (6 pages) Paper No: TRIB-15-1462; doi: 10.1115/1.4034077 History: Received December 28, 2015; Revised June 20, 2016

Titanium alloys are widely used in the field of artificial joints, but their poor wear resistance limits their clinical application. Therefore, in this paper, the diamondlike carbon (DLC) film deposited on Ti6Al4V alloy surface by unbalanced magnetron sputtering technology to improve its wear resistance. Swinging tests are conducted on a self-refit multifreedom degree friction tester, and their coefficient of friction, wear loss, and wear morphology were analyzed. Results show that there are no evident scratches on the socket surface with small axial load and angular displacement. The worst wear scratches appear under the largest load and swing angular displacement. A spot of scratches with different depths are found on the edge of the socket, which reveals the characteristic of swinging friction. The friction coefficient increases from 0.134 to 0.206 as the axial load increases, and increases from 0.11 to 0.186 as the swing angular displacement increases. Therefore, the swing angular displacement has greater influence on the wear degree. The wear mechanisms of DLC film involved a combination of fatigue, adhesive, and abrasive wear.

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Figures

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Fig. 1

Schematic diagram of multi-freedom degree friction tester: (1) big cam, (2) small cam, (3) swinging arm, (4) electric motor, (5) DLC film-deposited Ti6Al4V socket, (6) force sensor, (7) vessel, (8) UHMWPE ball, and (9) electric motor

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Fig. 2

Scanning electron microscopy (SEM) topography of DLC film section

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Fig. 3

Raman spectrum of DLC film

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Fig. 4

Schematic of sample size and contact form

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Fig. 5

The friction coefficient under different axial loads

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Fig. 6

The friction coefficient under different swing angular displacements

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Fig. 7

The wear loss of UHMWPE under different axial loads

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Fig. 8

The wear loss of UHMWPE under different swing angular displacements

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Fig. 9

SEM of DLC films under different axial loads: (a) P = 50 N (border), (b) P = 100 N (border), (c) P = 150 N (border), (d) P = 50 N (center), (e) P = 100 N (center), and (f) P = 150 N (center)

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Fig. 10

SEM of DLC films under different swing angular displacements: (a) θ = ±2.5 deg (border), (b) θ = ±5 deg (border), (c) θ = ±7.5 deg (border), (d) θ = ±2.5 deg (center), (e) θ = ±5 deg (center), and (f) θ = ±7.5 deg (center)

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Fig. 11

SEM of UHMWPE's worn surface

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