Microstructure analyses and thermophysical properties of nanostructured thermal barrier coatings / Hong Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 383-390 Titre : Microstructure analyses and thermophysical properties of nanostructured thermal barrier coatings Type de document : texte imprimé Auteurs : Hong Zhou, Auteur ; Fei Li, Auteur ; Bao-de Sun, Auteur Année de publication : 2009 Article en page(s) : p. 383-390 Note générale : Bibliogr. Langues : Américain (ame) Tags : Air  plasma  spray  Thermal  barrier  coatings  Microstructure  conductivity Index. décimale : 667.9 Revêtements et enduits Résumé : Nanostructured 8 wt% yttria partially stabilized zirconia coatings were deposited by air plasma spraying. Transmission electron microscopy, scanning electron microscopy, and X-ray diffraction were carried out to analyze the as-sprayed coatings and powders. Mercury intrusion porosimetry was applied to analyze the pore size distribution. Laser flash technique and differential scanning calorimetry were used to examine the thermophysical properties of the nanostructured coatings. The results demonstrate that the as-sprayed nanostructured zirconia coatings consist of the nonequilibrium tetragonal phase. The microstructure of the nanostructured coatings includes the initial nanostructure of powder and columnar grains. Moreover, micron-sized equiaxed grains were also exhibited in the nanostructured coatings. Their evolution mechanisms are discussed. The as-sprayed nanostructured zirconia coating shows a bimodal pore size distribution, and has a lower value of thermal conductivity than the conventional coating. DOI : 10.1007/s11998-008-9138-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9138-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6119 [article]

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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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Properties of TiN-matrix coating deposited by reactive HVOF spraying / Zhengping Mao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 2 (06/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 2 (06/2009) . - p. 243-250 Titre : Properties of TiN-matrix coating deposited by reactive HVOF spraying Type de document : texte imprimé Auteurs : Zhengping Mao, Auteur ; Jing Ma, Auteur ; Jun Wang, Auteur ; Bao-de Sun, Auteur Année de publication : 2009 Article en page(s) : p. 243-250 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone Anticorrosion Métaux -- Revêtements protecteurs Nitrure de titane Index. décimale : 667.9 Revêtements et enduits Résumé : TiN-matrix coating was prepared by reactive high velocity oxygen fuel (HVOF) spraying on carbon steel based on the self-propagating high temperature synthesis (SHS) technique in air. The phase composition, structures, and properties of TiN-matrix coating were analyzed using XRD, EDS, SEM and Vickers microhardness equipment. The anti-corrosion property in nearly neutral 3.5 w t% NaCl electrolytic solution was measured. The Weibull distribution of Vickers microhardness at different loads and their linear fitting were analyzed. The apparent fracture toughness of the coating was also calculated. The coating is composed of main phases (TiN, TiN0.3), minor phases (Ti2O3, TiO2), and porosity. The anti-corrosion property of an HVOF-sprayed TiN-matrix coating in electrolytic solution is superior to that of AISI 316L stainless steel. The microhardness values from 1137HV0.05 to 825HV1 are relatively high and have indentation size effect (ISE). With the increment of m, which increases with the increment of applied load, the microhardness values are more concentrated. The average value of apparent fracture toughness Kic is 4.62MPa}. m1/2. It is higher than that of reactive plasma sprayed (RPS) TiN coating, which reflects the good toughness of a TiN-matrix coating deposited by reactive HVOF spraying. DOI : 10.1007/s11998-008-9105-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9105-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5625 [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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