| Titre : | Chemical vapor synthesis and characterization of nanosized WC-Co composite powder and post-treatment (2009) |
| Auteurs : | Taegong Ryu, Auteur ; Hong Yong Sohn, Auteur ; Kyu Sup Hwang, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 47 N° 23, Décembre 2008) |
| Article en page(s) : | p. 9384–9388 |
| Note générale : | Chemistry engineering |
| Langues : | Anglais |
| Tags : | 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 |
