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Titolo:
A mechanistic study of oxidation-induced degradation in a plasma-sprayed thermal barrier coating system. Part I: Model formulation
Autore:
Busso, EP; Lin, J; Sakurai, S; Nakayama, M;
Indirizzi:
Hitachi Ltd, Mech Engn Res Lab, Hitachi, Ibaraki, Japan Hitachi Ltd Hitachi Ibaraki Japan Engn Res Lab, Hitachi, Ibaraki, Japan Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BX, England Univ London Imperial Coll Sci Technol & Med London England SW72BX gland
Titolo Testata:
ACTA MATERIALIA
fascicolo: 9, volume: 49, anno: 2001,
pagine: 1515 - 1528
SICI:
1359-6454(20010525)49:9<1515:AMSOOD>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED STRESSES; BEHAVIOR; PRESSURE; STRAIN; ALLOY;
Keywords:
thin films; thermal barrier coatings; interface; theory & modelling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Busso, EP Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2BX, England Univ London Imperial Coll Sci Technol & Med London England SW7 2BX
Citazione:
E.P. Busso et al., "A mechanistic study of oxidation-induced degradation in a plasma-sprayed thermal barrier coating system. Part I: Model formulation", ACT MATER, 49(9), 2001, pp. 1515-1528

Abstract

The effect of the oxidation induced degradation of a typical plasma-sprayed thermal barrier coating (PS-TBC) system on the local ceramic-metal interfacial stresses responsible for the nucleation of mesoscopic cracks is investigated. A coupled oxidation-constitutive approach is proposed to describe the effect of the phase transformations caused by local internal and external oxidation processes on the constitutive behaviour of the metallic coating. The coupled constitutive framework is implemented into the finite element method and used in parametric studies employing periodic unit cell techniques. The effects of service, microstructural and ceramic-metal interface parameters on the peak interfacial stresses during service and cooling to room temperature are quantified. The results of the parametric unit cell FE analyses revealed a strong dependency of the local stresses responsible for mesoscopic crack nucleation and growth on the local morphology of the oxidised interface, the sintering of the ceramic coating, stress relaxation effects due to creep, the thickness of the thermally grown oxide (TGO), and theapplied mechanical loads. When no mechanical straining of the TBC system is considered, local tensile stresses normal to the coating surface within the ceramic top coating reach values of up to 330 MPa at room temperature for a critical TGO thickness of approx. 3 mum. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 09:17:51