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TECHNICAL PAPERS

Nano-Scale Fatigue Wear of Carbon Nitride Coatings: Part I—Wear Properties

[+] Author and Article Information
Dong F. Wang

Laboratory of Biomechanical Engineering, Department of Mechatronics and Precision Engineering, Faculty of Engineering, Tohoku University, Sendai 980-8579, Japan

Koji Kato

Laboratory of Tribology, School of Mechanical Engineering, Tohoku University, Sendai 980-8579, Japan

J. Tribol 125(2), 430-436 (Mar 19, 2003) (7 pages) doi:10.1115/1.1537266 History: Received June 28, 2001; Revised August 01, 2002; Online March 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Generation of wear particles of a carbon nitride coating, in terms of normal load and friction cycles, based on in situ examination by E-SEM
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Schematic diagram, for definition of the critical number of friction cycles, Nc, for the generation of feather-like wear particles by in-situ observation with E-SEM
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A typical sliding process of a carbon nitride coating, of 100 nm thickness, against a diamond pin, in situ examined by E-SEM at normal load of 80 mN and humidity of 24 percent, where (a) shows no observable wear particles, (b) initial formation of feather-like wear particles, (c) and (d) show the further generation of wear particles for 16 and 20 friction cycles, respectively.
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Three-dimensional AFM images of contact tracks in carbon nitride coating surfaces, after 1, 6, 8, 9, 16, and 20 friction cycles, respectively. P-V means the peak-to-valley value of the wear track: (a) P-V=5.09 nm; (b) P-V=6.61 nm; (c) P-V=7.32 nm; (d) P-V=16.54 nm; (e) P-V=18.02 nm; and (f ) P-V=62.70 nm.
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An AFM image after 9 cycles (a), and the cross-sectional profile at the circle of the broken line (b), showing the scar of the “Delamination”
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An AFM image after 8 cycles (a), and the cross-sectional profile at the circle of the broken line (b), showing the scar of the deformed penetration pits
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Typical methodology for measuring the width and P-V value of contact track (b) in the AFM image (a), and for measuring the area using the triangular approximation (c) for the wear volume, and thus the specific wear amount
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P-V value of the contact track and the “Delamination” (a), and width of the contact track (b), for carbon nitride coating surface with respect to the number of friction cycles
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Effect of friction cycles on wear volume, corresponding to observations in Fig. 3 and Fig. 4. The volume of valleys is assumed to be positive wear and the volume of peaks as negative wear.
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Effect of friction cycles on specific wear amount, corresponding to observations in Fig. 3 and Fig. 4
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Effect of normal load on wear volume, corresponding to observations in Fig. 1 for 20 friction cycles
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Effect of normal load on specific wear amount, corresponding to observations in Fig. 1 for 20 friction cycles

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