Phase, microstructure, and oxidation resistance of yttrium silicates coatings prepared by a hydrothermal electrophoretic deposition process for C/C composites / Liu Miao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 4 (12/2009) . - p. 531-535 Titre : Phase, microstructure, and oxidation resistance of yttrium silicates coatings prepared by a hydrothermal electrophoretic deposition process for C/C composites Type de document : texte imprimé Auteurs : Liu Miao, Auteur ; Wu Jianpeng, Auteur ; Cao Liyun, Auteur ; Deng Fei, Auteur ; Zhang Yutaog, Auteur ; Huang Jianfeng, Auteur Année de publication : 2009 Article en page(s) : p. 531-535 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antioxydants Carbure de silicium Composites à fibres de carbone Dépôt électrophorétique Silicate d'yttrium Index. décimale : 667.9 Revêtements et enduits Résumé : Oxidation-resistant yttrium silicates coatings for SiC precoated carbon/carbon composites were prepared by a novel hydrothermal electrophoretic deposition process. Sonochemical-synthesized yttrium silicates nanocrystallites, isopropanol, and iodine were respectively used as source materials, solvent, and charging agent during the deposition. Phase compositions, surface and cross-section microstructures of the as-prepared multilayer coatings were characterized by an X-ray diffractometer (XRD) and a scanning electron microscopy (SEM). The influence of deposition temperatures on the phase, microstructure, and oxidation resistance of the multilayer coated C/C composites was particularly investigated. Results show that the as-prepared outer coatings are composed of yttrium silicates crystallites with a main phase of Y2Si2O7 and Y2SiO5. The thickness and density of the yttrium silicates coatings are improved with the increase of deposition temperature. Compared with SiC coating prepared by pack cementation, the multilayer coatings prepared by pack cementation with a later hydrothermal electrophoretic deposition process exhibit better antioxidation properties. The as-prepared multilayer coatings can effectively protect C/C composites from oxidation at 1773 K in air for 35 h with a weight loss of 0.32 x 10-3 g/cm2. DOI : 10.1007/s11998-008-9122-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9122-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7717 [article]

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The influence of microwave non-thermal effect on leather properties in drying / Jinwei Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 4 (04/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 4 (04/2017) . - p. 135-139 Titre : The influence of microwave non-thermal effect on leather properties in drying Type de document : texte imprimé Auteurs : Jinwei Zhang, Auteur ; Changlong Zhang, Auteur ; Wu Jianpeng, Auteur ; Wuyong Chen, Auteur Année de publication : 2017 Article en page(s) : p. 135-139 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Séchage Cuirs et peaux -- Propriétés mécaniques Micro-ondes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to study the influence of microwave, especially non-thermal effect, on leather properties, the microwave was used to dry leather together with the oven dried leather as a control. The back, butt and belly of dried leathers were tested for mechanical properties, softness, shrinkage temperature, chrome and fat migration, microstructure and dielectric constant. The results showed that microwave could improve the mechanical properties, softness and shrinkage temperature as a visible non-thermal effect. The non-thermal effect could also promote uniformity of chrome tanning agent and fatliquoring agent in leather and strengthen combination of these materials with collagen. In addition, the fiber weaving of microwave dried leather was more orderly and porous proved by SEM and XRD. Furthermore, the dielectric constant of microwave dried leather was higher than control, showing a direct proof of non-thermal effect for microwave. To sum up, Microwave in leather drying has not only thermal effect but also non-thermal effect on improving leather overall performance. Note de contenu : - EXPERIMENTAL : Materials - Leather drying process - Testing methods : Mechanical properties - Shrinkage temperature (Ts) - Chrome content and distribution - Fat content and distribution - Scanning electron microscope (SEM) - X-ray diffraction scanning (XRD) - Dielectric constant - RESULTS AND DISCUSSION : Influence of microwave drying on leather : Mechanical properties - Influence of microwave drying on leather shrinkage temperature-the indirect evidence of non-thermal effect - Influence of microwave drying on solute migration - The indirect evidence of non-thermal effect - Influence of microwave drying on fiber structure - The indirect evidence of non-thermal effect - Influence of microwave drying on leather dielectric constant - The direct evidence of non-thermal effect En ligne : https://drive.google.com/file/d/1gepEOCd9SBf0b-ZKzFVUVSRhlFGbQob8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28363 [article]

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