Development of Intermixed Zones of Alumina/Zirconia in Thermal Barrier Coating Systems

From: Metallurgical and Materials Transactions | Date: April 1, 2007| Author: Et al; Jackson, R W; Laney, S J; Yanar, N M; Stiger, M J | Copyright information

The mechanisms whereby intermixed zones of alumina and zirconia are formed at the interface between the metallic bond coat and the ceramic top coat (yttria-stabilized zirconia) in thermal barrier coating systems have been investigated. The results lead to the following mechanism for the formation of the zones. The predominant mechanism for intermixed zone formation involves formation of a metastable alumina polymorph (θ or γ) during TBC deposition, with a significant amount of zirco...

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