Chemistry of inorganic compounds – Nitrogen or compound thereof – Carbon containing
Patent
1995-07-17
1997-01-28
Langel, Wayne
Chemistry of inorganic compounds
Nitrogen or compound thereof
Carbon containing
423411, C01C 308, C01B 21076
Patent
active
055975437
ABSTRACT:
A spherical powder selected from the group consisting of titanium nitride, titanium carbonitride, titanium nitride containing a metal of the IVa, Va and VIa group of the periodic table, and titanium carbonitride containing a metal of the IVa, Va and VIa group of the periodic table, having an average grain size of more than 2 .mu.m and a narrow grain spectrum, is prepared by introducing into a reaction vessel a mixture of at least one substance selected from the group consisting of titanium metal, a metal of the IVa, Va and VIa group of the periodic table, and an oxide, carbide, nitride and carbonitride of said metals, and a carbon-containing substance, establishing a nitrogen atmosphere in the reaction vessel, heating the mixture in the reaction vessel to a temperature between 800.degree. C. and 2400.degree. C. and maintaining the temperature between 1400.degree. C. and 2000.degree. C. until gaseous reaction products are produced, removing the gaseous reaction products as they are produced while contacting the mixture with nitrogen or a nitrogen-generating gas, evacuating the reaction vessel to a pressure of < 10 mbar and subsequently flooding the same with nitrogen or a nitrogen-generating gas to a pressure of 50 to 1000 mbar, repeating the evacuation and flooding cycles several times, and cooling the resultant reaction product in the reaction vessel.
REFERENCES:
patent: 2461018 (1949-02-01), Alexander
patent: 3334974 (1967-08-01), Fletcher et al.
patent: 5147831 (1992-09-01), Zeiringer
Friedrich and Sittig, 1925, mentioned in: Hartstoffe, by Kiefer and Benesovsky, Vienna Springer Verlag 1963, p. 296.
Langel Wayne
Treibacher Industrie AG
LandOfFree
Spherical nitride does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spherical nitride, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spherical nitride will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-939996