Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with a crack at the TGO/bond-coat interface

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU126818" target="_blank" >RIV/00216305:26620/18:PU126818 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S025789721830032X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S025789721830032X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.surfcoat.2018.01.024" target="_blank" >10.1016/j.surfcoat.2018.01.024</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with a crack at the TGO/bond-coat interface

Popis výsledku v původním jazyce

Plasma-sprayed TBCs typically consist of a ceramic top-coat and a metallic bond-coat with an irregular metal/ceramic interface, which is required for better adhesion and, at the same time, generates tensile stresses responsible for in-service failure. Exposure to high-temperatures results in formation of a third, thin layer of thermally grown oxide (TGO) at the top-coat/bond-coat interface. One of the cracking mechanisms experimentally observed in these coatings is delamination at the TGO/bond-coat interfacial peaks. Such delamination cracks increase tensile stresses in the ceramic top-coat layer and may induce its cracking. This article provides the numerical study of the residual stress state of the YSZ (yttria partially-stabilized zirconia) top-coat in a conventional plasma-sprayed TBC system with a delamination crack centred at the TGO/bond-coat 3D cosine interfacial peak. The results show that the delamination crack induces considerable stresses in the YSZ layer; the small interfacial peaks are more likely to cause cracking above the peak, whereas the large peaks are more likely to cause off-peak cracking. Furthermore, it is shown that the aspect ratio (the ratio of amplitude to wavelength), which is often used in numerical studies to distinguish between various geometries, is not a unique parameter, since the changes in amplitude and wavelength are not equivalent.

Název v anglickém jazyce

Finite element simulation of stresses in a plasma-sprayed thermal barrier coating with a crack at the TGO/bond-coat interface

Popis výsledku anglicky

Plasma-sprayed TBCs typically consist of a ceramic top-coat and a metallic bond-coat with an irregular metal/ceramic interface, which is required for better adhesion and, at the same time, generates tensile stresses responsible for in-service failure. Exposure to high-temperatures results in formation of a third, thin layer of thermally grown oxide (TGO) at the top-coat/bond-coat interface. One of the cracking mechanisms experimentally observed in these coatings is delamination at the TGO/bond-coat interfacial peaks. Such delamination cracks increase tensile stresses in the ceramic top-coat layer and may induce its cracking. This article provides the numerical study of the residual stress state of the YSZ (yttria partially-stabilized zirconia) top-coat in a conventional plasma-sprayed TBC system with a delamination crack centred at the TGO/bond-coat 3D cosine interfacial peak. The results show that the delamination crack induces considerable stresses in the YSZ layer; the small interfacial peaks are more likely to cause cracking above the peak, whereas the large peaks are more likely to cause off-peak cracking. Furthermore, it is shown that the aspect ratio (the ratio of amplitude to wavelength), which is often used in numerical studies to distinguish between various geometries, is not a unique parameter, since the changes in amplitude and wavelength are not equivalent.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20506 - Coating and films

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Surface and Coatings Technology

ISSN

0257-8972

e-ISSN

—

Svazek periodika

337

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

321-334

Kód UT WoS článku

000430643900037

EID výsledku v databázi Scopus

2-s2.0-85041397689