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US 3,932,594 AGranted
Process for the preparation of fine grain metal carbide powders
AssigneeUnion Carbide Corporation
InventorFrank P. Gortsema
Life of this patent
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Abstract
Fine grain metal carbide powders are conveniently prepared from the corresponding metal oxide by heating in an atmosphere of methane in hydrogen. Sintered articles having a density approaching the theoretical density of the metal carbide itself can be fabricated from the powders by cold pressing, hot pressing or other techniques.
Claims8
A process for producing finely divided metal carbide powders which comprises the steps of
- a. impregnating a carbohydrate material with a compound of a metal, said metal being selected from the group consisting of tungsten, titanium, tantalum, molybdenum, zirconium, hafnium, thorium, or mixtures thereof;
- b. igniting the impregnated material product of step (a) at a temperature which does not exceed the temperature at which sintering occurs, to produce fragile agglomerates of sub-micron size metal oxide particles;
- c. comminuting the metal oxide product of step (b) to produce finely divided metal oxide powder having a mean particle size below micron;
- and
- d. heating said metal oxide powder in an atmosphere of methane and hydrogen to convert said metal oxide powder to metal carbide powder.
2 more elements
Dependencies are inferred from the claim text.