Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C

Popis výsledku v původním jazyce

In present work, the influence of isothermal heat treatment on structural changes of conventional thermal barrier coatings (TBCs) was studied. The CoNiCrAlY as metallic bond coat (BC) in thickness of 200 micrometer and 8 wt. % yttria stabilized zirconia (YSZ) as ceramic top coat (TC) in thicknesses of 200, 500 and 1000 micrometer were produced by means of atmospheric plasma spraying (APS). These coatings were sprayed onto the surface of newly developed fine-grained cast polycrystalline nickel-based superalloy Inconel 713LC. As-prepared samples were exposed to the temperature of 1050 C for 10 - 500 hours in ambient atmosphere. In comparison with the initial state, where discontinual islands of alumina were found on the bond coat–top coat interface, the uniform and continuous oxide layer, also termed thermally grown oxide (TGO), was observed there after the isothermal heat treatment. The growth of TGO layer in dependence on dwell time was also found on the expense of depletion of aluminium from the bond coat. Structural changes of bond coat promoted by above mentioned mechanism and growth of TGO were evaluated by means of electron microscopy and image analysis techniques.

Název v anglickém jazyce

Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C

Popis výsledku anglicky

In present work, the influence of isothermal heat treatment on structural changes of conventional thermal barrier coatings (TBCs) was studied. The CoNiCrAlY as metallic bond coat (BC) in thickness of 200 micrometer and 8 wt. % yttria stabilized zirconia (YSZ) as ceramic top coat (TC) in thicknesses of 200, 500 and 1000 micrometer were produced by means of atmospheric plasma spraying (APS). These coatings were sprayed onto the surface of newly developed fine-grained cast polycrystalline nickel-based superalloy Inconel 713LC. As-prepared samples were exposed to the temperature of 1050 C for 10 - 500 hours in ambient atmosphere. In comparison with the initial state, where discontinual islands of alumina were found on the bond coat–top coat interface, the uniform and continuous oxide layer, also termed thermally grown oxide (TGO), was observed there after the isothermal heat treatment. The growth of TGO layer in dependence on dwell time was also found on the expense of depletion of aluminium from the bond coat. Structural changes of bond coat promoted by above mentioned mechanism and growth of TGO were evaluated by means of electron microscopy and image analysis techniques.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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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

2013

Kód důvěrnosti údajů

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

Název statě ve sborníku

Metal 2013

ISBN

978-80-87294-41-3

ISSN

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e-ISSN

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Počet stran výsledku

2068

Strana od-do

1015-1020

Název nakladatele

TANGER Ltd.

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

15. 5. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000333163100165