Method of making carbide, nitride and boride powders

Details Method of making carbide, nitride and boride powders Method of making carbide, nitride and boride powders

1987-05-27

1989-07-25

Dixon, Jr., William R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427251, 427255, 4273833, 118716, 501 87, 501 88, 501 96, 423289, 423297, 423411, 423412, 423439, 423440, C23C 1604, C04B 3556, C04B 3558

Patent

active

048512621

ABSTRACT:
A method of making metal carbide, nitride, or boride powders and mixtures thereof by direct reduction of metal compounds comprises (a) forming a reactant mixture, (b) heating the reactant mixture to temperatures that cause solid reactants to vaporize and above which the metal precursor compounds are reduced, (c) passing the heated reactant mixture through a converging-diverging nozzle designed to reduce the temperature of the mixture to a temperature and for a time sufficient for further product species to form and for nuclei to form and grow by condensation to form the product powders, and (d) exhausting the mixture and product powders from the nozzle into an expansion chamber.

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