|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||9th International Symposium on High Temperature Metallurgical Processing
||Synthesis of Nanocrystalline Carbide Ceramics via Reduction of Anion-loaded Activated Carbon Precursors
||Grant Wallace, Jerome P. Downey, Jannette Chorney, Katie Schumacher, Alaina Mallard
|On-Site Speaker (Planned)
Ceramic carbide operations require large thermal and mechanical energy inputs in order to produce a powder product. A process which could reduce the energy requirements of these operations would allow for these materials to be implemented in more industrial applications. In this study, silicon carbide (SiC), tungsten carbide (WC), and molybdenum carbide (Mo2C) were synthesized via the carbothermal reduction of activated carbon loaded with silicate, tungstate, and molybdate anions adsorbed from aqueous solutions. Carburization was carried out under reducing and inert gas atmospheres, at temperatures lower than most commercial operations. Silicon carbide “whiskers” were synthesized under H2 at 1400oC, while molybdenum carbide and mixed crystals of WC, W2C, and W were synthesized at temperatures below 1000oC. X-ray diffraction and scanning electron microscopy were used to characterize the carburization products, and inductively coupled plasma-optical emission spectroscopy (ICP-OES) was used to determine the degree of adsorption onto the activated carbon matrix.