HIGH-TEMPERATURE ELECTROCHEMICAL SYNTHESIS OF CARBIDES, SILICIDES, AND BORIDES OF GROUP VIA METALS IN IONIC MELTS

On the basis of thermodynamic analysis of the chemical and electrochem ical reactions that provide the foundation for high-temperature electr ochemical synthesis, possible variants, systems, and conditions are de termined for the electrosynthesis of carbides, silicides, and borides of chromium, molybdenum, and tungsten. Within the thermodynamic regime , the electrosynthesis of molybdenum and tungsten carbide powders was performed from halide--oxide melts under excess carbon dioxide pressur e and from tungstate-molybdate-carbonate oxide melts. Within the kinet ic regime the electrosynthesis of the powders of silicides and borides of chromium, molybdenum, and tungsten was performed. Oxide and halide --oxide electrolytes were developed for electroplating with molybdenum and tungsten carbides.