Paper Title:
The Influence of Chemical Alloying on the High Temperature Wear Resistance of H-Free DLC Coatings
  Abstract

A commercial RF-sputtering deposition rig was employed to deposit H-free diamond-like carbon (DLC) coatings. The influence of alloying elements such as Ti and Si on the structure, mechanical and tribological properties of the coatings was investigated. The coating was observed in cross section and in plan view with SEM, TEM and AFM. Because of the highly-ionized plasma generated by the RF-powered glow discharge, ion bombardment suppresses the formation of a columnar structure regardless of the composition of the coatings. The method produces featureless microstructures and smooth surfaces. TEM investigations confirm that no crystalline phases form in the coatings regardless of the presence of considerable concentrations of Ti and Si. Tribological tests were performed with a high-temperature tribometer in a ball-on-disk configuration, using coated disks and different materials for the ball countepart. At ambient T the sliding friction coefficient decreases as the concentration of alloying elements increases. Nevertheless, high-T tribotests with a constant thermal load showed that the presence of alloying elements decreases the thermal stability of the coatings. For each coating a temperature exists above which a sudden increase of friction coefficient is observed, with subsequent detachment and failure of the coatings. The mechanism of disruption of the self-lubrication effects is identified and the influence of the alloying elements on the thermal degradation of tribological performance of the coatings is discussed.

  Info
Periodical
Advanced Materials Research (Volumes 15-17)
Edited by
T. Chandra, K. Tsuzaki, M. Militzer and C. Ravindran
Pages
1026-1031
DOI
10.4028/www.scientific.net/AMR.15-17.1026
Citation
D. Galvan, Y.T. Pei, J. T.M. de Hosson, A. Cavaleiro, "The Influence of Chemical Alloying on the High Temperature Wear Resistance of H-Free DLC Coatings", Advanced Materials Research, Vols. 15-17, pp. 1026-1031, 2007
Online since
February 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Y.T. Pei, Damiano Galvan, Jeff T.M. de Hosson
Abstract:TiC/a-C:H nanocomposite coatings have been deposited by magnetron sputtering and are composed of 2-5nm TiC nanocrystallites well separated by...
3655
Authors: Y.T. Pei, P. Huizenga, Damiano Galvan, Jeff T.M. de Hosson
Abstract:Advanced TiC/a-C:H nanocomposite coatings have been produced via reactive deposition in a closed-field unbalanced magnetron sputtering...
1074
Authors: Marcin Kot, Tomasz Moskalewicz, Bogdan Wendler, Aleksandra Czyrska-Filemonowicz, Wiesław Rakowski
Abstract:The nanocomposite coatings composed of nanocrystalline TiC grains embedded in hydrogen free amorphous carbon a-C matrix (nc-TiC/a-C) were...
36
Authors: Dmitry M. Kononov, Alexei V. Zhdanov, Valentin V. Morozov
Chapter 4: Crystallography, Chemical and Cathode Materials
Abstract:The article deals with producing diamondlike-PVD-coatings based on carbon: a-C and a-C:H and MeN/CNx. These types of coatings were prepared...
391
Authors: Yan Liang Su, Yueh Feng Lin
Chapter 1: Tribology Engineering and Applications
Abstract:W(100-x)%Cx% coatings with different tungsten and carbon contents were deposited by unbalanced...
184