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TECHNICAL PAPERS

Performance Improvement Under Boundary Lubrication Conditions Using Slider Bearings With Silicon Nitride/Steel in High Torque Hydraulic Motors

[+] Author and Article Information
O. Isaksson

Division of Machine Elements, Luleå University of Technology, S-971 87 Luleå, Sweden

R. Larker

R&D Division, Indexator AB, S-922 21 Vindeln, Sweden

J. Tribol 122(1), 348-353 (Jul 14, 1999) (6 pages) doi:10.1115/1.555366 History: Received January 04, 1999; Revised July 14, 1999
Copyright © 2000 by ASME
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References

Figures

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Schematic diagram of the test apparatus
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Coefficients of sliding friction at 40°C for grey iron (specimen #2) sliding against Cr-steel (#1) at a maximum Hertzian pressure of 39 MPa
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Coefficients of sliding friction at 40°C for coarse Si3N4 (#3, as ground) sliding against Cr-steel (#1) at 50 MPa maximum Hertzian pressure: ▴, new surface; ♦, after 1200 stick-slip cycles
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Coefficients of sliding friction at 40°C and 50 MPa maximum Hertzian pressure for smooth Si3N4 (#6, tumbled with abrasives for 4 hours preceding the final 100 hours without abrasives) sliding against Cr-steel (#1): ▴, new surface; ○, after 1200 stick-slip cycles
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Coefficients of sliding friction at 40°C and 50 MPa maximum Hertzian pressure for grey iron (#2) and all Si3N4 specimens (#3–6) sliding against Cr-steel (#1), plotted against Λ: —, specimen #2; ♦, specimen #3; □, specimen #4; ▵, specimen #5; ○, specimen #6
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Coefficients of static friction for all Si3N4 specimens (#3–6) against Cr-steel (#1) versus core roughness depth Rk
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Coefficients of static friction for all Si3N4 specimens (#3–6) against Cr-steel (#1) versus the ratio of the core roughness depth to the mean peak-to-valley height (Rk/Rz)
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Influence on the coefficient of friction from vibrations introduced for smooth Si3N4 (#6) against Cr-steel (#1). ♦, no vibrations; ▪, vibrations at 20 Hz; ▴, vibrations at 30 Hz
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Influence on the coefficient of friction from the higher viscosity at a low temperature, −28°C, for smooth Si3N4 (#6) sliding against Cr-steel (#1)

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