A Study of Reduced and Carburized Reactions in Dry-milled WO_3+CO_3O_4+C Mixed Powders with Different Carbon Content

摘要

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 dry-milling 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.