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Improving the tribological properties of DLC (Fullerene-like) films grown by ECR-CVD with metal nanoparticles incorporation

Published online by Cambridge University Press:  29 June 2011

Ainhoa Pardo  and
Cristina Gómez-Aleixandre
Ainhoa Pardo*
Affiliation:
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), C/ Sor Juana Inés de La Cruz, 3, Cantoblanco (28049), Madrid, Spain
Cristina Gómez-Aleixandre
Affiliation:
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), C/ Sor Juana Inés de La Cruz, 3, Cantoblanco (28049), Madrid, Spain
*
*Email: apardo@icmm.csic.es
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Abstract

Thin Me-DLC films with different metal contents have been deposited by ECR-CVD (Electron Cyclotron Resonance Chemical Vapour Deposition). Before the growth process, metal nanoparticles were scattered over the substrate surface by dipping it into a dispersion previously sonicated. The concentration of the dispersion (150, 300, 500 and 5000 ppm) controls the metal content into the carbon coating. The morphology of the deposited samples was analysed by SEM (Scanning Electron Microscopy). The metal content in the carbon films has been evaluated by SIMS (Secondary Ion Mass Spectroscopy). The incorporation of low amounts of metal nanoparticles into the hard carbon coating produces an outstanding improvement in the durability of the layer, as detected by pin-on-disc tests. For an optimum chromium content of 300 ppm of nanoparticles in the dispersion, the grown layer exhibits a noteworthy higher wear resistance respect to that of the DLC reference film. More precisely, in this case, the Cr-DLC coating undergoes ten times longer wear process than the reference DLC coating. However, it is important to indicate that in samples grown using more concentrated dispersions (> 300 ppm), a rapid deterioration of the coating is produced and short lifetimes have been detected, attributed to the large contribution of metal to the transfer layer.

Keywords

chemical vapor deposition (CVD) (chemical reaction)diamondtribology
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1339: Symposium S – Plasma-Assisted Materials Processing and Synthesis , 2011 , mrss11-1339-s04-01
Copyright
Copyright © Materials Research Society 2011

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