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High temperature properties of CrAlN, CrAlSiN and AlCrSiN coatings – structure and oxidation

Record type: Article

CrAlN, CrAlSiN and AlCrSiN coatings were deposited by cathodic arc deposition technique from composite targets. Three targets were used: (i) Cr/Al ratio close to 1, (ii) Cr/Al ratio close to 1 with Si addition, and (iii) Cr/Al ratio close to 1/2 and Si addition. Nitrogen flow was kept constant during the depositions. The Cr/Al ratio of the films, measured by electron probe microanalysis (EPMA), was similar to that of the target and the silicon content was in the range 3–4 at.%. The coatings were deposited onto FeCrAl alloy and WC/Co mirror-polished substrates. To analyze the coating structure, X-ray photoelectron (XPS) and X-ray diffraction (XRD) analysis were used. The evolution of the coating structure up to 1000 °C was in situ measured in a XRD apparatus equipped with heating plate. The films oxidation behavior was characterized by thermogravimetric analysis (TGA) at two selected temperatures. The annealed coatings were analyzed by XRD and scanning electron microscopy with energy-dispersive X-ray spectroscopy (EDX). CrAlSiN showed low oxidation resistance being partially oxidized at 800 °C. Moreover, the film exhibited low thermal stability, since the cubic nitride phases transformed to hexagonal nitrides at relatively low temperatures. CrAlN oxidation behavior was more promising; nevertheless, AlCrSiN showed excellent thermal stability with cubic nitrides observed even after heating to 1300 °C. The oxidation of this film at 900 and 1000 °C was negligible.

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Citation

Polcar, Tomas and Cavaleiro, Albano (2011) High temperature properties of CrAlN, CrAlSiN and AlCrSiN coatings – structure and oxidation Materials Chemistry and Physics, 129, (1-2), pp. 195-201. (doi:10.1016/j.matchemphys.2011.03.078).

More information

e-pub ahead of print date: 10 May 2011
Published date: 15 September 2011
Keywords: thin films, oxidation, thermogravimetric analysis, arc discharges, diffusion
Organisations: nCATS Group

Identifiers

Local EPrints ID: 199855
URI: http://eprints.soton.ac.uk/id/eprint/199855
ISSN: 0254-0584
PURE UUID: 40476852-ad67-44e8-a4d0-f0266fc0632e
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 20 Oct 2011 15:52
Last modified: 18 Jul 2017 11:15

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Contributors

Author: Tomas Polcar ORCID iD
Author: Albano Cavaleiro

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