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Adhesion of ZrN And SiC Thin Films on Titanium and Nickel Alloys

Published online by Cambridge University Press:  10 February 2011

K. A. Gruss ,
R. D. James  and
R. F. Davis
K. A. Gruss
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7919, [email protected]
R. D. James
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7919, [email protected]
R. F. Davis
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-7919, [email protected]
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Abstract

Chemically inert ceramic coatings are currently being investigated to extend the lifetime of metallic components operating in severe environments. Polycrystalline ZrN and amorphous SiC coatings were deposited by cathodic arc evaporation and by PACVD, respectively, on Titanium Grade 12 and Incoloy 825 metal substrates. The structure of the coatings was verified by SEM and XRD. Residual stress analyses were performed on the ZrN coatings via XRD using the sin2 φ method. Compressive stresses of 3.7 GPa and 2.5 GPa were calculated in the ZrN on the Incoloy and Titanium substrates, respectively. Studies of the interfacial chemistry via AES revealed chemically abrupt interfaces. Scratch tests were employed to assess the critical load for interfacial failure and fracture mechanisms for the various coating systems. Critical loads, charaterized by a kidney-shaped crack patterns found in the scratch tracks, occurred at 12 N for ZrN on Titanium and 20 N for ZrN on Incoloy. Interfacial failure of SiC on Titanium was dominated by brittle fracture of the SiC coating at 3N loads.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 410: Symposium S – Covalent Ceramics III-Science and Technology of Non-Oxides , 1995 , 383
Copyright
Copyright © Materials Research Society 1996

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