Fusion Tungsten Carbide Powder for Matrix of Diamond Drilling Tools

摘要

Developing some previous author's investigation, the paper presents results of researches performed in order to establish, on the basis of W-C phase diagram and by both thermodynamic and experimental approaches, the possibilities, conditions and influence of technological parameters of Fusion Tungsten Carbide (FTC) elaboration by reactive synthesis. Being a W_2C-WC quasi-eutectoid mixture, its elaboration involves W_2C and WC synthesis, which was established as being possible by SHS from a stoichiometric W-C powder mixture. A temperature over -2500 ℃ is necessary for the synthesis reaction ignition, but subsequent melting of the formed W_2C/WC occurs due to the evolved heat. Both high heating and cooling rates are necessary to suppress WC uncontrolled formation at heating, respectively W_2C decomposition at cooling to room temperature. Finally, appropriate wet-grinding conditions have to be adopted for its obtaining as powder of the requested particle size.