Effect of relative humidity and temperature on the tribology of multilayer micro/nanocrystalline CVD diamond coatings
authors Shabani, M; Abreu, CS; Gomes, JR; Silva, RF; Oliveira, FJ
nationality International
journal DIAMOND AND RELATED MATERIALS
author keywords Nanocrystalline diamond; Multilayers; Hot filament CVD; Friction; Wear
keywords CHEMICAL-VAPOR-DEPOSITION; COATED SILICON-NITRIDE; RAMAN-SPECTROSCOPY; CUTTING TOOLS; GRAIN-SIZE; FILMS; FRICTION; PERFORMANCE; BEHAVIOR; NANO
abstract The tribological behavior of tenfold micro/nanocrystalline CVD diamond multilayers is here investigated in self mated configuration using ball-on-plate reciprocating wear testing. The effects of relative humidity (RH) and temperature (T) on friction and wear coefficients are assessed. The strongest effect of humidity was found on the value of the critical load (no delamination) that triples from 40 N at 10%RH to 120 N at 90%RH. Evaluation of the wear coefficients of the plates was only possible with the use of 3D optical profilometry. A valley-shaped evolution is observed for the wear coefficient of the plates, within the 10% to 90% RH range, with a minimum of about 1.7x10(-7) mm(3)N(-1).m(-1), indicative of a mild wear regime, whereas the balls have lower values in the very mild wear regime of k - 10(-8) mm(3)N(-1).m(-1). The clearest difference between the RH and temperature experiments is observed for the critical loads, limited to the range 40-55 N at 50-100 degrees C, while at room temperature a value of 120 N was reached. However, the critical loads at high temperature are similar to those attained under dry conditions (s25% RH) highlighting the absence of water as the load bearing medium. (C) 2016 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0925-9635
isbn 1879-0062
year published 2017
volume 73
beginning page 190
ending page 198
digital object identifier (doi) 10.1016/j.diamond.2016.09.016
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000399519100030
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journal analysis (jcr 2017):
journal impact factor 2.232
5 year journal impact factor 2.209
category normalized journal impact factor percentile 56.667
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