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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Organic carbon dot coating for superhydrophobic aluminum alloy surfaces / Huaqiao Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 861-869 Titre : Organic carbon dot coating for superhydrophobic aluminum alloy surfaces Type de document : texte imprimé Auteurs : Huaqiao Peng, Auteur ; Lin Li, Auteur ; Qiang Wang, Auteur ; Yabo Zhang, Auteur ; Tianming Wang, Auteur ; Baozhan Zheng, Auteur ; Hong Zhou, Auteur Année de publication : 2021 Article en page(s) : p. 861-869 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Carbone Carbone organique Gravure Hydrophobie Morphologie (matériaux) Mouillabilité Revêtement auto-nettoyant Surfaces (Physique) Index. décimale : 667.9 Revêtements et enduits Résumé : A novel fluorine-free and silicon-free superhydrophobic aluminum alloy (treated-Al) is fabricated by chemical etching using hydrochloric acid and hydrogen peroxide and modified with an organic carbon dot (OCD) coating. The water contact angle (CA) of the treated-Al surface increases with the OCD concentration. When etched aluminum (etched-Al) is modified with 0.5 mg/ml OCDs, a CA of 161.4° is achieved, which indicates good nonwettability. SEM results verify that porous microstructures with cavities are uniformly distributed on the surface of etched-Al, in contrast to the bare aluminum alloy, which forms a primary rough structure. After treatment with 0.5 mg/ml OCDs, a nanoparticle coating is dispersed on the rough structures of treated-Al-0.5, which can trap air and make a water droplet essentially rest on a layer of air. The treated-Al-0.5 material has good self-cleaning properties and can sweep away contaminants at both 20 and 0°C. The Ecorr and Icorr of treated-Al-0.5 are − 0.56 V and 2.82 × 10−6 A/cm2, respectively, which shows good anticorrosion performance. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of OCDs - Preparation of superhydrophobic surfaces - Characterization of superhydrophobic surfaces - RESULTS AND DISCUSSION : Wettability of aluminum surface treated with OCDs - Surface morphology of aluminum surface treated with OCDs - Surface composition - Self-cleaning and anticorrosion applications DOI : https://doi.org/10.1007/s11998-020-00449-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00449-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35935 [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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