Multilayered diamond mechanical seal rings under biodiesel lubrication and the full sealing conditions of pressurized water
authors Shabani, M; Carrapichano, JM; Oliveira, FJ; Silva, RF
nationality International
journal WEAR
author keywords CVD diamond; Multilayers; Mechanical seal rings; biodiesel
keywords DRY LINE CONTACT; NANOCRYSTALLINE DIAMOND; TRIBOLOGICAL BEHAVIOR; FACE MATERIALS; THIN-FILMS; PERFORMANCE; COATINGS; GROWTH; CARBON; TOOLS
abstract A mechanical sealing tribosystem based on multilayer microcrystalline/nanocrystalline diamond (MCD/NCD) coatings is proposed. The tribological behaviour was investigated in ring-on-ring self-mated planar contact configuration. Tests were carried out under biodiesel lubrication and pressurized water (2 bar) sealing conditions. A 3D optical confocal profilometer was used to obtain for the first time the wear coefficients of seal rings, revealing a value of k=6.3 x 10(-10) mm(3)/N.m for biodiesel lubrication that is two orders of magnitude lower than for reciprocating sliding ball-on-flat experiments. The advantage of the multilayer strategy was demonstrated in the sealing of pressurized water, where full sealing conditions were achieved within the P x V range of 0.75-5.5 MPa ms(-1). For these coatings, full delamination is prevented due to structural discontinuity at the MCD/NCD interfaces whereas for a MCD monolayer coating, premature failure takes place and sealing is not reached. (C) 2017 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0043-1648
isbn 1873-2577
year published 2017
volume 384
beginning page 178
ending page 184
digital object identifier (doi) 10.1016/j.wear.2017.01.058
web of science category Engineering, Mechanical; Materials Science, Multidisciplinary
subject category Engineering; Materials Science
unique article identifier WOS:000404316400019
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journal analysis (jcr 2017):
journal impact factor 2.960
5 year journal impact factor 3.267
category normalized journal impact factor percentile 76.817
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