Adhesion of ZrN and SiC thin films on titanium and nickel alloys

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:470933

Gruss, K A; James, R D; Davis, R F ^[1]

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1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering

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 sin{sup 2} {phi} 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, characterized 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.

• Sponsoring Organization: Oak Ridge Inst. for Science and Education, TN (United States)
• OSTI ID: 470933
• Report Number(s): CONF-951155--; ISBN 1-55899-313-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
CHEMICAL VAPOR DEPOSITION
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HARDNESS
INCOLOY 825
INTERFACES
MECHANICAL PROPERTIES
RESIDUAL STRESSES
SILICON CARBIDES
SPUTTERING
SUBSTRATES
TITANIUM
YOUNG MODULUS
ZIRCONIUM NITRIDES