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Chemical vapor synthesis and characterization of nanosized WC-Co composite powder and post-treatment / Taegong Ryu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9384–9388 Titre : Chemical vapor synthesis and characterization of nanosized WC-Co composite powder and post-treatment Type de document : texte imprimé Auteurs : Taegong Ryu, Auteur ; Hong Yong Sohn, Auteur ; Kyu Sup Hwang, Auteur Année de publication : 2009 Article en page(s) : p. 9384–9388 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Chemical  vapor  WC-Co  composite Résumé : Nanosized WC−Co composite powders were produced by a chemical vapor synthesis (CVS) process. The reactions of vaporized chlorides (WCl6 and CoCl2) with methane−hydrogen mixtures produced nanosized WC−Co composite powder, which sometimes contained W2C or W phase. The effects of reactant concentrations, WCl6 volatilizer temperature, and H2 to CH4 molar ratio in the feed stream were investigated. The produced powder was heat-treated under hydrogen to fully carburize all tungsten carbide phases to WC and reduce carbon content down to nearly stoichiometric levels. Finally, WC−Co composite powders of particle size less than 70 nm with 0−3% excess carbon were obtained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800322y [article] Chemical vapor synthesis and characterization of nanosized WC-Co composite powder and post-treatment [texte imprimé] / Taegong Ryu, Auteur ; Hong Yong Sohn, Auteur ; Kyu Sup Hwang, Auteur . - 2009 . - p. 9384–9388. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9384–9388 Mots-clés : Chemical  vapor  WC-Co  composite Résumé : Nanosized WC−Co composite powders were produced by a chemical vapor synthesis (CVS) process. The reactions of vaporized chlorides (WCl6 and CoCl2) with methane−hydrogen mixtures produced nanosized WC−Co composite powder, which sometimes contained W2C or W phase. The effects of reactant concentrations, WCl6 volatilizer temperature, and H2 to CH4 molar ratio in the feed stream were investigated. The produced powder was heat-treated under hydrogen to fully carburize all tungsten carbide phases to WC and reduce carbon content down to nearly stoichiometric levels. Finally, WC−Co composite powders of particle size less than 70 nm with 0−3% excess carbon were obtained. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800322y