Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1994-02-15
1996-10-22
Group, Karkarl
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
423440, C04B 3556
Patent
active
055676626
ABSTRACT:
A method of making metallic carbide powders includes heating a non-static solid reactant mixture of a metal oxide and a source of carbon to a first elevated temperature which is sufficient to cause at least partial carburization of the mixture. The heating is performed in a non-reducing atmosphere having a total pressure of at least one atmosphere for a sufficient time to form a partially-carburized mixture. The source of carbon is employed at a level which is less than the stoichiometric amount needed to produce the metallic carbide. The method may further include admixing a sufficient level of a source of carbon to the partially-carburized mixture to form an adjusted mixture having a total carbon content of the stoichiometric amount needed to make the metallic carbide and carburizing the adjusted mixture in a hydrogen-containing atmosphere at a second elevated temperature which is sufficient to cause the adjusted mixture to form the metallic carbide having a particle size of less than 0.2 micrometers in diameter.
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Dunmead Stephen D.
Mossner David D.
Group Karkarl
The Dow Chemical Company
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