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TECHNICAL PAPERS

The Effect of Film Thickness on Initial Friction of Elastic-Plastically Rough Surface With a Soft Thin Metallic Film

[+] Author and Article Information
Zhiqiang Liu, Anne Neville, R. L. Reuben

Department of Mechanical and Chemical Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK

J. Tribol 124(3), 627-636 (May 31, 2002) (10 pages) doi:10.1115/1.1454103 History: Revised July 19, 2001; Received September 14, 2001; Online May 31, 2002
Copyright © 2002 by ASME
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References

Bowden, F. P., and Tabor, D., 1954, The Friction and Lubrication of Solids, Oxford University Press, Oxford.
Finkin,  E. F., 1969, “A Theory for the Effects of Film Thickness and Normal Load in the Friction of Thin Films,” ASME J. Lubr. Technol., 91, pp. 551–556.
Dayson,  C., 1971, “The Friction of Very Thin Solid Film Lubrication on Surface of Finite Roughness,” ASLE Trans., 14, pp. 105–115.
Halling,  J., 1975, “A Contribution to the Theory of Mechanical Wear,” Wear, 34, pp. 239–249.
El-Sherbiney,  M. G. D., and Halling,  J., 1976, “The Hertizian Contact of Surfaces Covered With Metallic Films,” Wear, 40, pp. 325–337.
El-Sherbiney,  M. G. D., and Halling,  J., 1977, “Friction and Wear of Ion-Plated Soft Metallic Films,” Wear, 45, pp. 211–220.
Halling,  J., 1979, “Surface Coatings,” Tribol. Int., 10, pp. 203–208.
El Shafei,  T. E. S., Arnell,  R. D., and Halling,  J., 1983, “An Experimental Study on the Hertzian Contact of Surfaces Covered by Soft Metal Films,” ASLE Trans., 26, pp. 481–486.
Ogilvy,  J. A., 1993, “Predicting the Friction and Durability of MoS2 Coatings Using a Numerical Contact Model,” Wear, 160, pp. 171–180.
El-Sherbiney,  M. G. D., and Salem,  F. B., 1979, “Initial Wear Rates of Soft Metallic Films,” Wear, 54, pp. 391–400.
El-Sherbiney,  M. G. D., and Salem,  F. B., 1986, “Tribological Properties of PVD Silver Films,” ASLE Trans., 29, pp. 223–228.
Kato,  S., Yamaguchi,  K., Marui,  E., and Tachi,  K., 1982, “Friction Properties of a Surface Covered with a Soft Metal Film—Part 2: Analysis of Friction Between a Single Protuberance and a Surface,” ASME J. Lubr. Technol., 104, pp. 39–45.
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Paslay,  P. R., and Plunkett,  R., 1953, “Design of Shrink-Fits,” Trans. ASME, 75, pp. 1199–1202.
Chang,  W. R., Etsion,  I., and Bogy,  D. B., 1988, “Static Friction Coefficient Model for Metallic Rough Surfaces,” ASME J. Tribol., 110, pp. 57–63.
Rabinowicz,  E., 1967, “Variation of Friction and Wear of Solid Lubricant Films With Film Thickness,” ASLE Trans., 10, pp. 1–9.
Tian,  H., and Saka,  N., 1991, “Finite Element Analysis of an Elastic-Plastic Two Layer Half-Space: Normal Contact,” Wear, 148, pp. 47–68.
Derjaguin,  B. V., Muller,  V. M., and Toporov,  Yu. P., 1975, “Effect of Contact Deformations on the Adhesion of Particles,” J. Colloid Interface Sci., 53, pp. 314–326.
Muller,  V. M., Derjaguin,  B. V., and Toporov,  Y. P., 1983, “On Two Methods of Calculation of the Force of Sticking of an Elastic Sphere to a Rigid Plane,” Colloids Surf., 7, pp. 251–259.
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Figures

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AFM image of a scratch on a silver film deposited onto a smooth glass plate and surface profiles corresponding to three line scans across the scratch (shown in the AFM image by the solid lines)
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Dynamic coefficient of friction versus sliding distance for different film thicknesses (normal load=12 N, sliding velocity=17 mm/s)
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The wear resistance of silver films with different initial thicknesses (normal load=12 N, sliding velocity=17 mm/s)
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Static friction coefficient versus film thickness under a pressure of 11.35 Mpa
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Static friction coefficient versus pressure for steel on steel and steel on silver film (t=0.085 μm), respectively
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Energy dispersive X-ray analysis (a) for worn surface and (b) for wear debris
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Scanning electron micrograph of the edge of contact region on silver-coated plate (t=0.1 μm)
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Scanning electron micrograph of transferred film on the pin surface (normal load=12 N)
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Scanning electron micrograph of wear track after one stroke sliding (t=0.1 μm)
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Scanning electron micrograph of microcutting soft film on the pin from the plate after one stroke sliding (t=0.1 μm)
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Scanning electron micrographs of wear track on the plate after 1 m of sliding: (a) microcutting products; (b) patches or transfer film (t=0.1 μm).
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Scanning electron micrographs of wear track on the plate surface after 2 m of sliding (t=0.1 μm)
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The geometry of an asperity contact
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Dimensionless radius of the coated surface versus dimensionless radius of the substrate contact surface, for a single asperity contact
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Ratio of dimensionless contact area of coated surface to dimensionless contact area of substrate surface versus dimensionless substrate contact area, for a single asperity contact
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Static friction coefficient versus dimensionless external force
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Comparison of the calculated result with experimental data for F/AnE=10−4
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Comparison of the calculated result with experimental data, for t=0 and t=0.085 μm
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Effective hardness constant of film versus static friction coefficient for various film thicknesses at F/AnE=10−4
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The geometry of contacting rough surfaces with a thin film

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