Microstructure and thermal cycling behavior of thermal barrier coating on near-a titanium alloy / Bo He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 3 (09/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 3 (09/2007) . - p. 335-340 Titre : Microstructure and thermal cycling behavior of thermal barrier coating on near-a titanium alloy Type de document : texte imprimé Auteurs : Bo He, Auteur ; Fei Li, Auteur ; Hong Zhou, Auteur ; Yongbing Dai, Auteur ; Bao-de Sun, Auteur Année de publication : 2007 Article en page(s) : p. 335-340 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt en phase vapeur Matériaux -- Propriétés barrières Protection thermique Rayonnement électronique Titane -- Alliages Index. décimale : 667.9 Revêtements et enduits Résumé : Two kinds of thermal barrier coatings (TBCs), consisting of NiCoCrAlY bond coats (BCs) deposited by electron beam-physical vapor deposition (EB-PVD) and high velocity oxy-fuel (HVOF) thermal spraying, respectively, and top 8 wt%oY2O3-ZrO2 (8YSZ) ceramic layers deposited by EB-PVD were prepared on near-a titanium alloys. The field emission scanning electronic microscopy and microhardness indentation are used to study the microstructure and microhardness. Different failure features including cracking patterns and the delamination degree of these two TBCs are discussed according to the thermal cycling tests in the atmosphere. It is found that the morphology of the two BCs deposited by different methods (EB-PVD and HVOF) determines the microstructure and microhardness of their corresponding top 8YSZ layers. The BC prepared by EB-PVD is dense and homogeneous, which leads to a dense and hard 8YSZ with clustered slim columnar grains. The BC prepared by HVOF, however, is porous and inhomogeneous in microstructure and, as a result, the top ceramic layer is loose with low microhardness and clustered coarse columnar grains. DOI : 10.1007/s11998-007-9046-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9046-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3649 [article]

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Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy / Bo He in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 1 (03/2008) . - p. 99-106 Titre : Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy Type de document : texte imprimé Auteurs : Bo He, Auteur ; Bao-de Sun, Auteur ; Yongbing Dai, Auteur ; Hong Zhou, Auteur ; Fei Li, Auteur Année de publication : 2008 Article en page(s) : p. 99-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dépôt par pulvérisation Métaux -- Revêtements protecteurs Projection thermique Revêtement métallique Revêtements -- Défauts Titane -- Alliages Index. décimale : 667.9 Revêtements et enduits Résumé : A thermal spray technology high-velocity oxygen fuel (HVOF) was used to deposit NiCoCrAlY as a bond coating between the titanium alloy substrate and top 8 wt% yttria-stabilized zirconia thermal-barrier coating (TBC) deposited by electron beam-physical vapor deposition (EB-PVD). The thermal cycling and isothermal exposure tests were conducted to evaluate the durability of the TBC. Investigations using OM, SEM, EPMA, and XRD revealed that the thermal-sprayed BC makes the TBC more durable in isothermal exposure tests but more short-lived in thermal cycling tests, in comparison to our previous study in which the BC was prepared by EB-PVD. This is because the thermal-sprayed imperfections, such as microcracks and voids, elevate the diffusion resistance and degrade the mechanical properties of the BC, simultaneously. To current TBC systems in which the BC is deposited by HVOF, thermal failure behaviors—such as the formation of the Ti/Al mixture oxides at some individual places in the BC, and the Ti2Ni gaps formed around the BC/substrate interface—were also discussed. DOI : 10.1007/s11998-007-9070-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9070-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3620 [article]

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