Journal
WEAR
Volume 271, Issue 9-10, Pages 2106-2110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2010.12.059
Keywords
Polycrystalline diamond; PCD; Hydrodynamic; Wear-in; Thrust bearings; Fluid-film
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Polycrystalline diamond (PCD) bearings are designed for use in harsh environments, including process-fluid-lubricated applications such as those in oil and gas drilling turbines. This paper discusses the wear-in behaviour of polycrystalline diamond thrust bearings. Laboratory test results are presented that show the roughness, profile, and coefficient of friction of the polycrystalline diamond wear pads as the wear-in of the polycrystalline diamond bearings progresses. Laboratory test results show a significant decrease in the surface roughness and a change in the profile of the wear pads. Measured values of the coefficients of friction reveal that the lubrication regime of PCD thrust bearings can move from boundary to mixed-mode and may even become hydrodynamic after wearing-in for a period of time under the right conditions. This mechanism can provide extended life for PCD thrust bearings in harsh environments. (C) 2011 Elsevier B.V. All rights reserved.
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