Alumina-silica composite coatings on graphite by CVD at 550°C / Zhaofeng Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 3 (07/2006) . - p. 231-235 Titre : Alumina-silica composite coatings on graphite by CVD at 550°C Type de document : texte imprimé Auteurs : Zhaofeng Chen, Auteur ; Min Li, Auteur ; Yikai Shi, Auteur Année de publication : 2006 Article en page(s) : p. 231-235 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Composites Dépôt chimique en phase vapeur Graphite Revêtements protecteurs Silicate d'aluminium Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : Alumina-silica composite coatings were prepared on the surface of graphite paper by chemical vapor deposition using AlCl3/SiCl4/H2/CO2 as precursor in the temperature range of 300 to 550°C. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to examine the phase composition and the microstructure of the coating, respectively. The results indicated that a dense, uniform, and adherent alumina-silica composite coating can be prepared on graphite paper substrate by chemical vapor deposition at 550°C. Alumina-silica composite coating is composed of particles or nodules of varying size. Each particle is often composed of a number of finer particles. The phases of the 550°C composite coating include gamma-alumina and amorphous silica. The elemental chlorine content in the composite coating decreases with increasing deposition temperature. The surfaces of the alumina-silica composite coatings are affected by deposition temperature. There are some obvious micro-cracks in the 300°C composite coating, which are attributed to a mismatch of the coefficient of thermal expansion between composite coating and graphite paper. The 550°C alumina-silica composite coating can be completely turned into mullite after heat-treatment at 1350°C for 0.5 hr in argon atmosphere. DOI : 10.1007/BF02774512 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774512.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3696 [article]

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Effect of heat treatment at 1300°C on W coating prepared by double-glow plasma on carbon/carbon composite / Ying Zhang 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. 237-241 Titre : Effect of heat treatment at 1300°C on W coating prepared by double-glow plasma on carbon/carbon composite Type de document : texte imprimé Auteurs : Ying Zhang, Auteur ; Dan Fang, Auteur ; Wangping Wu, Auteur ; Chen Liangbing, Auteur ; Zhaofeng Chen, Auteur Année de publication : 2009 Article en page(s) : p. 237-241 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone Revêtements:Peinture Technique des plasmas Index. décimale : 667.9 Revêtements et enduits Résumé : W-coated carbon/carbon composite has been considered as an attractive ITER plasma facing material in fusion devices. In this paper, W coating was prepared on the carbon/carbon composite substrate by double-glow plasma method using pure W as target. Argon was input into the chamber as the plasma and the reactive gas. W-coated carbon/carbon composite was heat-treated in vacuum furnace at 1300°C for 1 h. Phase and microstructure of W coating were examined by X-ray diffraction and scanning electron microscopy, respectively. The chemical composition of W coating was analyzed by energy dispersive spectroscopy. The micro-hardness of the W coating was estimated by nano-indentation instrument. The results indicated that a continuous and dense W-modified layer could be successfully coated on the carbon/carbon composite surface by double-glow plasma method. W coating completely reacted with C to form WC at 1300°C. WC almost completely diffused into the carbon/carbon composite after heat treatment. The great decrease in elemental W on the carbon/carbon composite surface after heat treatment led to a significant reduction in micro-hardness. DOI : 10.1007/s11998-008-9109-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9109-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5624 [article]

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Ir coating prepared on Mo substrate by double glow plasma / Wang Liangbing 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. 517-522 Titre : Ir coating prepared on Mo substrate by double glow plasma Type de document : texte imprimé Auteurs : Wang Liangbing, Auteur ; Zhaofeng Chen, Auteur ; Pingze Zhang, Auteur ; Wangping Wu, Auteur ; Ying Zhang, Auteur Année de publication : 2009 Article en page(s) : p. 517-522 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Dense and adherent Ir coating was obtained on the surface of the Mo substrate by double glow plasma, which had a deposition chamber and two cathodes. Argon gas was used as the working gas. The bias voltage of Ir target and Mo substrate were -800 and -300 V, respectively. The chamber pressure was 35 Pa. Microstructure of the Ir coating was observed by scanning electron microscopy. The Ir coating had a polycrystalline structure with preferential growth orientation of (220) crystal plane. The deposition rate was ~3.5 µm/h. The good adhesion resulted from the buffer layer between the Mo substrate and the Ir coating. The buffer layer, a combined Ir and Mo, was formed at the beginning of the deposition. The Mo concentration distributed gradiently along the depth of the buffer layer. DOI : 10.1007/s11998-008-9123-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9123-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7695 [article]

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