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Mechanical properties and microstructural analysis of a diamond-like carbon coating on an alumina/glass composite

Published online by Cambridge University Press:  31 January 2011

S. Christiansen ,
M. Albrecht ,
H. P. Strunk ,
H. Hornberger ,
P.M. Marquis  and
J. Franks
S. Christiansen
Affiliation:
Universität Erlangen-Nürnberg, Institut für Werkstoffwissenschaften-Mikrocharakterisierung, Cauerstr. 6, 91058 Erlangen, Germany
M. Albrecht
Affiliation:
Universität Erlangen-Nürnberg, Institut für Werkstoffwissenschaften-Mikrocharakterisierung, Cauerstr. 6, 91058 Erlangen, Germany
H. P. Strunk
Affiliation:
Universität Erlangen-Nürnberg, Institut für Werkstoffwissenschaften-Mikrocharakterisierung, Cauerstr. 6, 91058 Erlangen, Germany
H. Hornberger
Affiliation:
University of Birmingham, School of Dentistry, Biomaterials Unit, St. Chad's Queensway, Birmingham B4 6NN, United Kingdom
P.M. Marquis
Affiliation:
University of Birmingham, School of Dentistry, Biomaterials Unit, St. Chad's Queensway, Birmingham B4 6NN, United Kingdom
J. Franks
Affiliation:
Diavac ACM Ltd., 2 Brookfield Ave., Ealing, London W5 1LA, United Kingdom
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Abstract

We investigate the mechanical and microstructural properties of a diamond-like carbon coating (DLC) which is deposited by plasma enhanced chemical vapor deposition (PECVD) onto an alumina/aluminosilicate glass composite used for biomedical applications. Ball-on-ring tests yield a fracture strength that is essentially influenced by the surface topology/roughness. The surface topology of the coating is investigated by atomic force microscopy (AFM). Tribology tests and nanoindentation represent the wear resistance and hardness; these are properties that are mainly influenced by the microstructural properties of the DLC coating. This microstructure is investigated by transmission electron microscopy (TEM) and analyzed by parallel electron energy loss spectroscopy (PEELS). For the general applicability of the coated composite, the interfacial adhesion of the DLC coating on the comparably rough substrate (roughness amplitudes and wavelengths are in the micrometer range) is important. Therefore, we focus on TEM investigations that show the interface to be free of gaps and pores that we, together with a characteristic microstructure adjacent to the interface, relate to the excellent adhesion. The interlayer consists of a high density of SiC grains, part of them directly bound to the substrate, and part of them bound to other SiC grains. This interlayer is followed by an essentially different region of the coating as concerns the microstructure; this region consists of nanocrystalline diamond particles embedded in an amorphous carbon matrix. It is this heterogeneous microstructure to which we attribute (i) the good adhesion based upon the interface stabilizing SiC grains, and (ii) the high hardness and wear resistance based upon the diamond nanocrystals in the coating.

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Type
Articles
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Journal of Materials Research , Volume 11 , Issue 8 , August 1996 , pp. 1934 - 1942
Copyright
Copyright © Materials Research Society 1996

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