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Pd additives and atomic hydrogen can accelerate kinetic processes in  molybdenum reduction from molybdenum trioxide with hydrogen at 350°C in the  presence of carbon. Such a low temperature reduction process (starting  temperature 300-350°C) promotes the formation of a thermodynamically unstable  nanodispersed phase with the specific surface area of 280 m2/g, which may be  related to the formation of the intermediate cubic molybdenum suboxide  Mo1-xO, responsible for the preservation of the MoO3 faceting. The specific  surface area of 280 m2/g corresponds to the particle size ~3 nm. The phase  transformation leading to the formation of Mo2C in the MoO3-Pd-H2-C system at  a relatively low temperature (650°C) is the result of relaxation of the high  free energy in the thermodynamically unstable system. The carbide formation  process at such a low temperature yields carbide with the specific surface  area from 4 to 40 m2/g (depending on the carbide-forming component), which  can be easy sintered. The morphology of this carbide inherits the faceting of  the initial whiskerous trioxide molybdenum. The microhardness of the sintered  samples is significantly higher than that of carbide produced traditionally  at high temperature.

Using non-equilibrium state in the MoO3-H-C system for low temperature synthesis of ultradispersed molybdenum carbide powders