Microstructure of WC/C coatings deposited on steel substrates

J.T.M. de Hosson, N.J.M. Carvalho

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Electron microscopy, including scanning (SEM), transmission (TEM) and high-resolution (HRTEM) were employed to characterise slightly different tungsten carbide/carbon coatings deposited onto steel substrates. Complementary techniques, such as X-ray diffraction (XRD), Auger electron spectroscopy (AES) and energy filtered TEM (GIF) were also used. The coatings were deposited by magnetron sputtering of pure WC and Cr targets in a plasma decomposition of C2H2 in mixed Ar-C2H2 discharges. The coatings are made up of a chromium interlayer, a coarse WC/C intermultilayer, a WC layer, and the WC/C multilayer. The chromium interlayer has a body centred cubic phase and a dense columnar structure, while the remaining coating is truly amorphous, with the exception of polycrystalline particles and clusters that are present within some layers. Crystalline particles and clusters were identified as having the cubic beta -WC1-x phase. Defects in the coatings were also found, due to substrate surface irregularities and to the growth structure of the chromium columns.

Original languageEnglish
Title of host publicationHost Publication
EditorsCA Brebbia
Place of PublicationSouthampton
PublisherWIT Press
Pages359-368
Number of pages10
ISBN (Print)1-85312-873-2
Publication statusPublished - 2001
Event5th International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects - , Spain
Duration: 20-Jun-200122-Jun-2001

Publication series

NameCOMPUTATIONAL AND EXPERIMENTAL METHODS
PublisherWIT PRESS
Volume6
ISSN (Print)1466-7266

Other

Other5th International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects
Country/TerritorySpain
Period20/06/200122/06/2001

Keywords

  • DIAMOND-LIKE CARBON
  • FILMS
  • FRICTION

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