Diamond coating of steel at high temperatures in hot filament chemical vapour deposition (HFCVD) employing chromium interlayers

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Bareiss C, Perle M, Rosiwal S, Singer R
Zeitschrift: Diamond and Related Materials
Verlag: ELSEVIER SCIENCE SA
Jahr der Veröffentlichung: 2006
Band: 15
Heftnummer: 4-8
Seitenbereich: 754-760
ISSN: 0925-9635
Sprache: Englisch


Abstract


Since diamond coating via hot filament chemical vapour deposition (HFCVD) processes is possible, the coating of steel substrates is in the focus of research programs. As the direct deposition onto steel is not possible yet, the role of interlayers is of extraordinary importance. In this work, we deposited diamond onto steel samples with chromium carbide interlayers at temperatures above 800 degrees C without film delamination after deposition. Further advantages of this process are an improved chemical activation of the surface at high temperatures, a higher growth rate and a higher quality (sp(3)-ratio) of the diamond film. The mismatch in thermal expansion of diamond, interlayer and steel leads to high residual compressive stresses in the diamond layer, but about 30% less than theoretically expected. We ascribe this stress reduction to the specific thermal expansion characteristics of a certain class of steels, which show a alpha-gamma phase transformation during cooling down from 850 degrees C. This transformation from closer packed gamma-phase (fcc-structure, austenite) to alpha-phase (bcc-structure, ferrite) comes along with a volume expansion of approx. 1% and enables the reduction of the high residual compressive stresses in the diamond film, analysed via Raman spectroscopy. (c) 2005 Elsevier B.V. All rights reserved.



FAU-Autoren / FAU-Herausgeber

Rosiwal, Stefan PD Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Bareiss, C., Perle, M., Rosiwal, S., & Singer, R. (2006). Diamond coating of steel at high temperatures in hot filament chemical vapour deposition (HFCVD) employing chromium interlayers. Diamond and Related Materials, 15(4-8), 754-760. https://dx.doi.org/10.1016/j.diamond.2005.10.053

MLA:
Bareiss, Christian, et al. "Diamond coating of steel at high temperatures in hot filament chemical vapour deposition (HFCVD) employing chromium interlayers." Diamond and Related Materials 15.4-8 (2006): 754-760.

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