VERFAHREN ZUR HERSTELLUNG VON SUBMIKROMETRISCHEN ÜBERGANGSMETALLKARBONITRIDEN

A submicrometer transition metal carbonitride is produced having the formula:MaM'bM''(1-a-b) (C1-x) Nx)zwherein M is Ti, Zr or Hf; M' is V, Nb or Ta; M'' is Cr, Mo or W; a ranges from 0 to 1; b ranges from 0 to 1 with the proviso that (a +b) is less than or equal to 1;...

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Bibliographic Details
Main Authors DUNMEAD, STEPHEN, D, WEIMER, ALAN, W
Format Patent
LanguageGerman
Published 15.06.2002
Edition7
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
COMPOUNDS THEREOF
CONCRETE
INORGANIC CHEMISTRY
LIME, MAGNESIA
METALLURGY
NON-METALLIC ELEMENTS
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary:A submicrometer transition metal carbonitride is produced having the formula:MaM'bM''(1-a-b) (C1-x) Nx)zwherein M is Ti, Zr or Hf; M' is V, Nb or Ta; M'' is Cr, Mo or W; a ranges from 0 to 1; b ranges from 0 to 1 with the proviso that (a +b) is less than or equal to 1; x ranges from about 0.02 to about 0.95 and z ranges from about 0.9 to about 2. The transition metal carbonitride is produced by mixing (a) a transition metal oxide source of a transition metal in the above formula and (b) a carbon source such as carbon black. This mixture is heated at a rate of between about 100K/sec to about 100,000,000K/sec in a nitrogen containing non-oxidizing gas such as nitrogen or nitrogen mixed with argon to an elevated temperature that makes carbothermal reduction of the transition metal oxide source thermodynamically favorable for a residence time sufficient to convert the transition metal oxide source into at least one product selected from the group consisting of (i) a transition metal carbonitride and (ii) a transition metal carbonitride precursor. The product may be exposed to a finishing step involving heating the product to a temperature less than the elevated temperature in a finishing atmosphere such as nitrogen, hydrogen, inert gas or combinations thereof to form submicrometer carbonitrides of higher purity or different stoichiometry.
Bibliography:Application Number: AT19980906710T