Mechanisms controlling the durability of thermal barrier coatings

Citation
Ag. Evans et al., Mechanisms controlling the durability of thermal barrier coatings, PROG MAT SC, 46(5), 2001, pp. 505-553
Citations number
83
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
PROGRESS IN MATERIALS SCIENCE
ISSN journal
0079-6425 → ACNP
Volume
46
Issue
5
Year of publication
2001
Pages
505 - 553
Database
ISI
SICI code
0079-6425(2001)46:5<505:MCTDOT>2.0.ZU;2-J
Abstract
The durability of thermal barrier coatings is governed by a sequence of cra ck nucleation, propagation and coalescence events that accumulate prior to final failure by large scale buckling and spalling. Because of differing ma nufacturing approaches and operating scenarios, several specific mechanisms are involved. These mechanisms have begun to be understood. This article r eviews this understanding and presents relationships between the durability , the governing material properties and the salient morphological features. The failure is ultimately connected to the large residual compression in t he thermally grown oxide through its roles in amplifying imperfections near the interface. This amplification induces an energy release rate at cracks emanating from the imperfections that eventually buckle and spall the TBC. (C) 2001 Elsevier Science Ltd. All rights reserved.