Tribological testing of self-mated nanocrystalline diamond coatings on Si3N4 ceramics
authors Abreu, CS; Amaral, MS; Oliveira, FJ; Tallaire, A; Benedic, F; Syll, O; Cicala, G; Gomes, JR; Silva, RF
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords nanocrystalline diamond; silicon nitride; tribological characterization
keywords CHEMICAL-VAPOR-DEPOSITION; CVD DIAMOND; THIN-FILMS; FRICTION; GROWTH; NUCLEATION
abstract Due to their much lower surface roughness compared to that of microcrystal line diamond, nanocrystalline diamond (NCD) films are promising candidates for tribological applications, in particular when deposited on hard ceramic materials such as silicon nitride (Si3N4). In the present work, microwave plasma-assisted chemical vapour deposition of NCD is achieved using Ar/H-2/CH4 gas mixtures on plates and ball-shaped Si3N4 specimens either by a conventional continuous mode or by a recently developed pulsed regime. The microstructure, morphology, topography and purity of the deposited films show typical NCD features for the two kinds of substrate shapes. Besides, tribological characterization of the NCD/ Si3N4 samples is carried out using self-mated pairs without lubrication in order to assess their friction and wear response. Worn surfaces were studied by SEM and AFM topography measurements in order to identify the prevalent wear mechanisms. Friction values reached a steady-state minimum of approximately 0.02 following a short running-in period where the main feature is a sharp peak which attained a maximum around 0.44. Up to the critical load of 35 N, corresponding to film delamination, the equilibrium friction values are similar, irrespective of the applied load. The calculated wear coefficient values denoted a very mild regime (K similar to 1 x 10(-8) mm(3) N-1 m(-1)) for the self-mated NCD coatings. The predominant wear mechanism was identified as self-polishing by micro-abrasion. (c) 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
year published 2006
volume 200
issue 22-23
beginning page 6235
ending page 6239
digital object identifier (doi) 10.1016/j.surfcoat.2005.11.071
web of science category Materials Science, Coatings & Films; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000237842300015
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