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Factors affecting the microstructural stability and durability of thermal barrier coatings fabricated by air plasma spraying / M. A. Helminiak in Materials and corrosion, Vol. 63 N° 10 (Octobre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 929–939 Titre : Factors affecting the microstructural stability and durability of thermal barrier coatings fabricated by air plasma spraying Type de document : texte imprimé Auteurs : M. A. Helminiak, Auteur ; N. M. Yanar, Auteur ; F. S. Pettit, Auteur Année de publication : 2013 Article en page(s) : pp. 929–939 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : APS;  durability;  EBPVD;  thickness;  TBC;  YSZ  purity Résumé : The high-temperature behavior of high-purity, low-density (HP-LD) air plasma sprayed (APS) thermal barrier coatings (TBCs) with NiCoCrAlY bond coats deposited by argon-shrouded plasma spraying is described. The high purity yttria-stabilized zirconia resulted in top coats which are highly resistant to sintering and transformation from the metastable tetragonal phase to the equilibrium mixture of monoclinic and cubic phases. The thermal conductivity of the as-processed TBC is low but increases during high temperature exposure even before densification occurs. The porous topcoat microstructure also resulted in good spallation resistance during thermal cycling. The actual failure mechanisms of the APS coatings were found to depend on topcoat thickness, topcoat density, and the thermal cycle frequency. The failure mechanisms are described and the durability of the HP-LD coatings is compared with that of state-of-the-art electron beam physical vapor deposition TBCs. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206646/abstract [article] Factors affecting the microstructural stability and durability of thermal barrier coatings fabricated by air plasma spraying [texte imprimé] / M. A. Helminiak, Auteur ; N. M. Yanar, Auteur ; F. S. Pettit, Auteur . - 2013 . - pp. 929–939. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 929–939 Mots-clés : APS;  durability;  EBPVD;  thickness;  TBC;  YSZ  purity Résumé : The high-temperature behavior of high-purity, low-density (HP-LD) air plasma sprayed (APS) thermal barrier coatings (TBCs) with NiCoCrAlY bond coats deposited by argon-shrouded plasma spraying is described. The high purity yttria-stabilized zirconia resulted in top coats which are highly resistant to sintering and transformation from the metastable tetragonal phase to the equilibrium mixture of monoclinic and cubic phases. The thermal conductivity of the as-processed TBC is low but increases during high temperature exposure even before densification occurs. The porous topcoat microstructure also resulted in good spallation resistance during thermal cycling. The actual failure mechanisms of the APS coatings were found to depend on topcoat thickness, topcoat density, and the thermal cycle frequency. The failure mechanisms are described and the durability of the HP-LD coatings is compared with that of state-of-the-art electron beam physical vapor deposition TBCs. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206646/abstract