Shear strength of a thermal barrier coating parallel to the bond coat

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2806834· OSTI ID:634575

Cruse, T A; Dommarco, R C; Bastias, P C ^[1]

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1. Vanderbilt Univ., Nashville, TN (United States). Mechanical Engineering Dept.

The static and low cycle fatigue strength of an air plasma sprayed (APS) partially stabilized zirconia thermal barrier coating (TBC) is experimentally evaluated. The shear testing utilized the Iosipescu shear test arrangement. Testing was performed parallel to the TBC-substrate interface. The TBC testing required an innovative use of steel extensions with the TBC bonded between the steel extensions to form the standard Iosipescu specimen shape. The test method appears to have been successful. Fracture of the TBC was initiated in shear, although unconstrained specimen fractures propagated at the TBC-bond coat interface. The use of side grooves on the TBC was successful in keeping the failure in the gage section and did not appear to affect the shear strength values that were measured. Low cycle fatigue failures were obtained at high stress levels approaching the ultimate strength of the TBC. The static and fatigue strengths do not appear to be markedly different from tensile properties for comparable TBC material.

• Sponsoring Organization: USDOE
• OSTI ID: 634575
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 1 Vol. 120; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FATIGUE
PLASMA ARC SPRAYING
SHEAR PROPERTIES
SPRAYED COATINGS
STATIC LOADS
STEELS
STRESSES
YTTRIUM OXIDES
ZIRCONIUM OXIDES