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Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays / C.M. Weyant in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 943-951 Titre : Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays Type de document : texte imprimé Auteurs : C.M. Weyant, Auteur ; J. Almer, Auteur ; K. T. Faber, Auteur Article en page(s) : pp. 943-951 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Plasma  spraying  X-ray  diffraction  Crystalline  oxides  Coatings  Residual  stresses Index. décimale : 669 Métallurgie Résumé : High-energy X-rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-ray technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays [texte imprimé] / C.M. Weyant, Auteur ; J. Almer, Auteur ; K. T. Faber, Auteur . - pp. 943-951. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 943-951 Mots-clés : Plasma  spraying  X-ray  diffraction  Crystalline  oxides  Coatings  Residual  stresses Index. décimale : 669 Métallurgie Résumé : High-energy X-rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-ray technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]

Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays / C.M. Weyant in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 943–951 Titre : Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays Type de document : texte imprimé Auteurs : C.M. Weyant, Auteur ; J. Almer, Auteur ; K. T. Faber, Auteur Année de publication : 2011 Article en page(s) : pp. 943–951 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Plasma  spraying  X-ray  diffraction  Crystalline  oxides  Coatings  Residual  stresses Résumé : High-energy X-rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-ray technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006892 [article] Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-rays [texte imprimé] / C.M. Weyant, Auteur ; J. Almer, Auteur ; K. T. Faber, Auteur . - 2011 . - pp. 943–951. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 943–951 Mots-clés : Plasma  spraying  X-ray  diffraction  Crystalline  oxides  Coatings  Residual  stresses Résumé : High-energy X-rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-ray technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006892