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Research Papers: Tribochemistry & Tribofilms

Contact Mechanisms of Transfer Layered Surface During Sliding Wear of Amorphous Carbon Film

[+] Author and Article Information
X. Fan

e-mail: dfdiao@mail.xjtu.edu.cn Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

D. F. Diao1

e-mail: dfdiao@mail.xjtu.edu.cn Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

1

Corresponding author.

J. Tribol 133(4), 042301 (Oct 19, 2011) (10 pages) doi:10.1115/1.4004999 History: Received December 27, 2010; Accepted September 02, 2011; Published October 19, 2011; Online October 19, 2011

The contact mechanisms of a transfer layered surface during sliding wear of a Si3 N4 ball against the amorphous carbon film were investigated. In this study, amorphous carbon films were deposited by electron cyclotron resonance plasma sputtering technique. The dependence of friction coefficient and wear life of the films on transfer layer was tested with pin-on-disk tribometer. Wear tracks and the transfer layered surfaces at different friction coefficient stages were observed with scanning electron microscope and measured with energy dispersive spectrometer In order to clarify the contact mechanisms of a transfer layered surface, three contact models of initial high friction coefficient stage without transfer layer (state I), transfer layer forming stage with friction coefficient decreasing (state II), and transfer layered surface stable sliding stage with low friction coefficient (state III) were proposed, and the contact stresses (normal stress, shear stress, von Mises stress) of the three contact states were calculated by using finite element analysis. The results demonstrated that a transfer layer formed at the contact interface and gradually decreased the maximum contact stresses, which contributed to the long wear life of amorphous carbon films.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic illustration of ECR Plasma Sputtering Equipment

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Figure 2

Characterizations of the ECR carbon film. (a) Cross-sectional HRTEM picture; (b) Peak fitting result of Raman spectrum (Vb  =+ 10 V); (c) Peak fitting result of C 1 s spectrum (Vb  =+ 10 V); (d) The fractions of sp3 and sp2 bonds by XPS.

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Figure 3

Schematic illustration of Pin-on-Disk tribometer

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Figure 4

Typical friction curves of the amorphous carbon films with substrate bias voltages of −10 V (a), + 10 V (b), and + 30 V (c)

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Figure 5

Friction coefficients and wear lives of the amorphous carbon films with different substrate bias voltages

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Figure 6

Wear tracks on the amorphous carbon film surfaces at three different stages. 6(a) High friction coefficient stage; (b) friction coefficient decreasing stage; (c) low friction coefficient stage (A: grooves, B: flaking, C: wear debris).

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Figure 7

EDS testing positions on the surfaces of the amorphous carbon film (a) and the Si3 N4 ball (b)

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Figure 8

Carbon contents of the amorphous carbon film (a) and the Si3 N4 ball (b) tested by EDS

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Figure 9

Load-displacement curves of the amorphous carbon film, transfer layer and the Si3 N4 ball

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Figure 10

Schematic contact states during the sliding wear process. (a) Initial high friction coefficient stage; (b) Friction coefficient decreasing stage; (c) Low friction coefficient stage; (d) Amorphous carbon film worn out stage.

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Figure 11

FEA schematic models of state I without a transfer layer (a), state II/III with different sizes of transfer layers (b) and mesh models (c)

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Figure 12

Normalized pressure distributions of three contact states

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Figure 13

Variations of normal stress σxx (a), shear stress σxy (b), and von Mises stress σvon (c) distributions along the amorphous carbon film surface at three contact states

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