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Effect of atmosphere composition on the oxidation behavior of MCrAlY coatings / P. Song in Materials and corrosion, Vol. 62 N° 7 (Juillet 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 7 (Juillet 2011) . - pp. 699–705 Titre : Effect of atmosphere composition on the oxidation behavior of MCrAlY coatings Type de document : texte imprimé Auteurs : P. Song, Auteur ; M. Subanovic, Auteur ; J. Toscano, Auteur Année de publication : 2011 Article en page(s) : pp. 699–705 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : MCrAlY-bondcoat  H2/H2O  Oxidation  TBC  Zr Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In the present work the effect of atmosphere composition on the growth rate and adherence of the alumina scales was studied using free-standing MCrAlY-coatings and TBC-specimens with MCrAlY-bondcoats. The exposures comprised isothermal and cyclic exposures in laboratory air and Ar-H2-H2O at 1100 °C. It is shown that minor Zr-addition to the bondcoat results in enhanced scale growth and internal oxidation. This effect is independent of the atmosphere composition. As a consequence of the rapid oxide formation the times to TBC failure on the Zr-containing bondcoat in both atmospheres were much shorter compared to those with Zr-free bondcoat. In the latter case the formation of a thin compact alumina TGO was slower in H2/H2O than in air resulting in significantly longer TBC-lifetime in the former atmosphere. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005851/abstract [article] Effect of atmosphere composition on the oxidation behavior of MCrAlY coatings [texte imprimé] / P. Song, Auteur ; M. Subanovic, Auteur ; J. Toscano, Auteur . - 2011 . - pp. 699–705. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 7 (Juillet 2011) . - pp. 699–705 Mots-clés : MCrAlY-bondcoat  H2/H2O  Oxidation  TBC  Zr Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In the present work the effect of atmosphere composition on the growth rate and adherence of the alumina scales was studied using free-standing MCrAlY-coatings and TBC-specimens with MCrAlY-bondcoats. The exposures comprised isothermal and cyclic exposures in laboratory air and Ar-H2-H2O at 1100 °C. It is shown that minor Zr-addition to the bondcoat results in enhanced scale growth and internal oxidation. This effect is independent of the atmosphere composition. As a consequence of the rapid oxide formation the times to TBC failure on the Zr-containing bondcoat in both atmospheres were much shorter compared to those with Zr-free bondcoat. In the latter case the formation of a thin compact alumina TGO was slower in H2/H2O than in air resulting in significantly longer TBC-lifetime in the former atmosphere. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005851/abstract