The effect of bond coat oxidation on the failure of thermal barrier coatings

Conference · Fri Dec 30 23:00:00 EST 1994

OSTI ID:160428

Lee, E Y ^[1]; Sisson, Jr, R D ^[2]

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1. Andong National Univ. (Korea, Republic of)
2. Worcester Polytechnic Inst., MA (United States)

The formation of the oxides such as the spinel (Ni(Al,Cr){sub 2}O{sub 4}), Cr{sub 2}O{sub 3}, NiO and CoO in the bond coat oxidation products would accelerate the failure of the EB-PVD thermal barrier coatings during cyclic oxidation. It was found that Al{sub 2}O{sub 3} developed first, followed by the Cr/Ni rich oxides (such as Ni(Al,Cr){sub 2}O{sub 4}, Cr{sub 2}O{sub 3} and NiO) at the interface between the PSZ ceramic coatings and NiCoCrAlY bond coats in a cyclic high temperature environment. For the EB-PVD TBCs, the smooth interface between the PSZ ceramic coating and the bond coat would be also responsible for the failure during cyclic oxidation.

• OSTI ID: 160428
• Report Number(s): CONF-940684--; ISBN 0-87170-509-5
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
EFFICIENCY
FRACTURES
GAS TURBINES
INTERFACES
MICROSTRUCTURE
NICKEL ALLOYS
OXIDATION
PERFORMANCE
PHYSICAL VAPOR DEPOSITION
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
THERMAL CYCLING
X-RAY DIFFRACTION
YTTRIUM ALLOYS
YTTRIUM OXIDES
ZIRCONIUM OXIDES