Back to results
US 4,394,161 AGranted
Method of producing a vanadium- and nitrogen-containing material for use as an addition to steel
AssigneeUnion Carbide Corporation
InventorRoy R. Hannum
Life of this patent
Estimating the term…
Abstract
A method for producing a vanadium- and nitrogen-containing material (V.sub.2 N) in which nitrogen gas is introduced into a furnace containing a mixture of V.sub.2 O.sub.3 and carbon in stoichiometric proportion while simultaneously maintaining the temperature in the furnace in a range of from about 1000.degree. C. to 1500.degree. C. under a reduced pressure in the range of from about 5 mm to 100 microns.
Claims1
A method for making a material containing vanadium and nitrogen substantially in the form of V.sub.2 N, said method comprising:
- (i) providing a mixture of V.sub.2 O.sub.3 and carbon in substantially stoichiometric proportions in accordance with the following formula:
- V.sub.2 O.sub.3 +3C.fwdarw.2V+3CO
- (ii) subjecting the mixture in a furnace to a temperature in the range of about 1000.degree. C. to 1500.degree. C. under a reduced pressure in the range of about 5 mm to 100 microns to cause reaction between mixture constituents and the evolution of CO;
- (iii) continuously maintaining the temperature and pressure in the furnace in the respective ranges specified in (ii) while simultaneously and continuously introducing nitrogen gas into the furnace to provide a nitrogen atmosphere in the furnace until CO is essentially no longer evolved from the mixture;
- and
- (iv) subsequently cooling the mixture in a nonoxidizing environment.
3 more elements
Dependencies are inferred from the claim text.