| Titre : | Effect of atmosphere composition on the oxidation behavior of MCrAlY coatings (2011) |
| Auteurs : | P. Song, Auteur ; M. Subanovic, Auteur ; J. Toscano, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Materials and corrosion (Vol. 62 N° 7, Juillet 2011) |
| Article en page(s) : | pp. 699–705 |
| Note générale : | Génie Mécanique |
| Langues : | Anglais |
| Index. décimale : | 620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux) |
| Tags : | MCrAlY-bondcoat H2/H2O Oxidation TBC Zr |
| 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 |
