A Study of Reduced and Carburized Reactions in Dry-Milled WO3+Co3O4+C Mixed Powders with Different Carbon Content
The dry-milling technique was used for mixing and crushing oxides and graphite powder to get homogeneous mixed powders. The weight ratio of ball-to-powder was 30:1 and argon gas was filled in jar. The carbon content was more 10~ 20wt% than the stoichiometric amount. The drymilling was carried for 20 hours. After milling, the mixed powders were reduced and carburized at 900~980°C for 3 hours flowing Ar gas in tube furnace. The dry-milled powders showed wide diffraction patterns of X-ray. The reactions of reduction and carburization were completed in 3 hours at 980°C. After the reactions, the mean size of WC particles was about 200 nm. The content of free carbon in WC/Co mixed powders decreased as the reaction temperature increased.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
H. S. Im et al., "A Study of Reduced and Carburized Reactions in Dry-Milled WO3+Co3O4+C Mixed Powders with Different Carbon Content", Materials Science Forum, Vols. 534-536, pp. 1149-1152, 2007