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
|