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TECHNICAL PAPERS

Characterization of Pelletized MoS2 Powder Particle Detachment Process

[+] Author and Article Information
C. Fred Higgs, Hooshang Heshmat

Mohawk Innovative Technology, Inc., 1037 Watervliet-Shaker Road, Albany, NY 12205

J. Tribol 123(3), 455-461 (Mar 30, 2000) (7 pages) doi:10.1115/1.1310158 History: Received May 27, 1999; Revised March 30, 2000
Copyright © 2001 by ASME
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References

Heshmat,  H., Pinkus,  O., and Godet,  M., 1989, “On Common Tribological Mechanism Between Interacting Surfaces,” STLE Trans., 32, No. 1, pp. 32–41.
Heshmat,  H., 1995, “The Quasi-Hydrodynamic Mechanism of Powder Lubrication: Part III—On Theory and Rheology of Triboparticulates, STLE Tribol. Trans., 38, No. 2, pp. 269–276.
Heshmat, H., and Brewe, D. E., 1992, “On the Cognitive Approach toward Classification of Dry Triboparticulates,” Elsevier Science Publ. Tribology Series 27, Elsevier Science Publishing Co., Inc., New York.
Heshmat, H., and Brewe, D. E., 1992, “On Some Experimental Rheological Aspects of Triboparticulates,” Wear Particles: From the Cradle to the Grave, D. D. Dowson, C. M. Taylor, T. H. Childs, M. Godet, and G. Dalmaz, eds., Elsevier Tribology Series 21, Elsevier Science Publishers BV (North-Holland), Amsterdam, Netherlands, pp. 357–367.
Godet,  M., 1984, “The Third-Body: Approach: A Mechanical View of Wear,” Wear, 100, pp. 437–452.
Heshmat,  H., 1991, “The Quasi-Hydrodynamic Mechanism of Powder Lubrication: Part I—Lubricant Flow Visualization,” STLE Tribol. Trans., 48, No. 2, pp. 96–104.
Winer,  W. O., 1967, “Molybdenum Disulfide as a Lubricant: A Review of Fundamental Knowledge,” Wear, 10, pp. 422–452.
Farr,  J. P., 1975, “Molybdenum Disulphide as a Lubricant: A Review,” Wear, 35, pp. 1–22.
Johnson,  V., and Vaughn,  G., 1956, “Investigation of the Mechanism of MoS2 Lubrication in Vacuum,” J. Appl. Phys., 27, No. 10, pp. 1173.
Lancaster,  J. K., 1965, “Lubrication by Transferred Films of Solid Lubricants,” ASLE Trans., 8, pp. 146–155.
Centers,  P. W., 1987, “The Role of Oxide and Sulfide Additions in Solid Lubricant Compacts,” Tribol. Trans., 31, pp. 149–156.
Brendle,  M., Fatkin,  J., Turgis,  P., and Gilmore,  R., 1990, “Mechanisms of Graphite Transfer on Steel as Studied by Image Analysis,” Tribol. Trans., 33, No. 4, pp. 471–480.
Brendle,  M., Turgis,  P., and Lamouri,  S., 1996, “A General Approach to Discontinuous Transfer Films: The Respective Role of Mechanical and Physico-Chemical Interactions,” Tribol. Trans., 39, No. 1, pp. 157–165.
Dareing,  D. W., and Atluri,  S., 1997, “Traction Behavior and Physical Properties of Powder Graphite Lubricants Compacted to Hertzian Pressure Levels,” Tribol. Trans., 40, No. 3, pp. 413–420.
Diss,  P., and Brendle,  M., 1997, “A General Approach to Discontinuous Transfer Films: Influence of Sliding Speed and Stick-Slip Phenomena,” Wear, 203–204, pp. 564–572.
Rietema, K., 1991, The Dynamics of Fine Powders, Elsevier Science Publishing Co., Inc., New York, pp. 5.
Higgs,  C. F., Heshmat,  C., and Heshmat,  H., 1999, “Comparative Evaluation of MoS2 and WS2 as Powder Lubricants in High Speed, Multi-Pad Journal Bearings,” ASME J. Tribol., 121, No. 3, pp. 625–630.
Heshmat,  H., 1992, “The Quasi-Hydrodynamic Mechanism of Powder Lubrication: Part II—Lubricant Film Pressure Profile,” STLE Tribol. Trans., 48, No. 5, pp. 373–383.
Grattan,  P., and Lancaster,  J., 1967, “Abrasion by Lamellar Solid Lubricants,” Wear, 10, pp. 453–468.
Peterson,  M., and Johnson,  R., 1958, “Friction and Wear Investigations of MoS2 I: Effect of Moisture,” NACA TN,30, No. 55, p. 1953.
Fusaro, R., 1978, “A Comparison of the Lubrication Mechanisms of Graphite Fluoride and Molybdenum Disulfide Films,” 2nd International Conference on Solid Lubrication, E. Bisson, ed., pp. 59–78.
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Figures

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Variables affecting powder flow behavior and powder properties
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Tribometer for testing powder pellets
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Wear data under lubricated conditions at a constant speed of U=4.5 m/s,Ta=RT, for compacted MoS2 on TiC disk
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Friction data under lubricated conditions at a constant speed of N=500 rpm (4.5 m/s), Ta=RT, for compacted MoS2 on TiC disk
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Friction data under lubricated conditions at a constant speed of N=500 rpm (4.5 m/s), Ta=RT, for compacted MoS2 on TiC disk
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Wear data under lubricated conditions at a constant speed of U=4.5 m/s,Ta=RT, for compacted MoS2 on TiC disk
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Friction data under lubricated conditions at a constant speed of N=500 rpm (4.5 m/s), Ta=RT, for compacted MoS2 on TiC disk
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Friction data under lubricated conditions at a constant speed of N=500 rpm (4.5 m/s), Ta=RT, for compacted MoS2 on TiC disk
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Photomicrograph of powder C before and after testing: (a) micrograph of sample C before compaction (2000×); (b) micrograph of sample C wear debris compacted to 34.5 MPa (5 ksi) after wear (2000×) [σyy=3.45×104 kPa;Wn=8.9 N (2 lb); U=3 m/s]
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Friction coefficient versus Sommerfeld number: friction coefficient of MoS2 pellet versus non-dimensional load and speed parameter sample C, σyy=5 Ksi,Wn=1.1 kg t26r1
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Mapping of starting friction after various rest periods: frictional behavior of pelletized MoS2 as a function of rest duration between tests

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