Chemistry of inorganic compounds – Carbon or compound thereof – Binary compound
Patent
1996-10-02
1999-02-09
Lewis, Michael
Chemistry of inorganic compounds
Carbon or compound thereof
Binary compound
501 93, C01B 3134
Patent
active
058690190
ABSTRACT:
In order to eliminate the oxygen sensitivity of chromium carbide and vanadium carbide particles, vanadium carbide and chromium carbide particles are formed by carburizing a precursor compound at a elevated reaction temperature of about 950.degree. C. Initially, the precursor compound is heated in an inert nitrogen-containing gas to the reaction temperature. Once the reaction temperature is achieved, hydrogen and a carbon-containing gas such as methane or ethylene are used to conduct the carbonization. After the carbonization has been completed, the carbonizing gas is then replaced with an inert nitrogen-containing gas and the product allowed to cool down. The carbonization cycle is adjusted so that the oxygen level is kept to less than 0.35%, while the nitrogen level is kept at about 2%. Powders produced from this process show minimal or no oxygen pickup when exposed to ambient air.
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Hendrikson Stuart L.
Lewis Michael
Nanodyne Incorporated
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