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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F13%3APU104551" target="_blank" >RIV/00216305:26620/13:PU104551 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Structural stability of plasma sprayed CoNiCrAlY – ZrO2+Y2O3 thermal barrier coatings after isothermal exposure at 1050 C
Original language description
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.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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