Submicron carbonitride powders and their use
AssigneeHermann C. Starck GmbH & Co. KG
InventorsBenno Gries, Gerhard Gille, Mario Salvadori
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Abstract
This invention relates to submicron carbonitride powders of titanium and, optionally, other transition metals of the fifth (Me.sup.(5)) and sixth (Me.sup.(6)) secondary group of the periodic system of elements which have the following general molar composition: (Ti.sub.L Me.sub.M.sup.(5) Me.sup.(6).sub.1-L-M) (C.sub.1-y N.sub.y).sub.z with 0.50.ltoreq.L.ltoreq.1; 0.ltoreq.m.ltoreq.0.15; 0.ltoreq.(1-L-M).ltoreq.0.50; 0.10.ltoreq.y.ltoreq.0.95 and z.gtoreq.0.90, to a process for the production of these powders and to their use.
Claims7
Submicron carbonitride powders of titanium and, optionally, other transition metals of the fifth (Me.sup.(5)) and sixth (Me.sup.(6)) secondary group of the periodic system of elements which have the following general molar composition:
- (Ti.sub.l Me.sub.m.sup.(5) Me.sup.(6).sub.1-L-m)(C.sub.l-y N.sub.y).sub.z with 0.50.ltoreq.L.ltoreq.1;0.ltoreq.M.ltoreq.0.15;0.ltoreq.(1-L-M).ltoreq.0.50 ;0.10.ltoreq.y.ltoreq.0.95 and z.gtoreq.0.90, wherein the particle shape factor f determined from SEM image analyses lies within the limits 0.80.ltoreq.f.ltoreq.0.90 in regard to the mean value f and the associated standard deviation (delta) f is .ltoreq.0.10.
Submicron carbonitride powders of titanium and, optionally, other transition metals of the fifth (Me.sup.(5)) and sixth (Me.sup.(6)) secondary group of the periodic system of elements which have the following general molar composition:
- (Ti.sub.L Me.sub.m.sup.(5) Me.sup.(6).sub.1-L-m)(C.sub.l-y N.sub.y).sub.z with 0.50.ltoreq.L.ltoreq.1;0.ltoreq.M.ltoreq.0.15;0.ltoreq.(1-L-M).ltoreq.0.50 ;0.10.ltoreq.y.ltoreq.0.95 and z.gtoreq.0.90, wherein the powders have the following particle size distribution characteristics (volume), as determined with a SHIMADZU centrifuge:
- d.sup.c (10).ltoreq.0.35 .mu.m,
- d.sup.c (50) .ltoreq.0.70 .mu.m,
- d.sup.c (90) .ltoreq.1.65 .mu.m.
Submicron carbonitride powders of titanium and, optionally, other transition metals of the fifth (Me.sup.(5) and sixth (Me.sup.(6) secondary group of the periodic system of elements which have the following general molar composition:
- (Ti.sub.l, Me.sub.M.sup.(5) Me.sup.(6).sub.1-L-M) (C.sub.1-y N.sub.y)z with 0.50.ltoreq.L.ltoreq.1;0.ltoreq.M.ltoreq.0.15;0.ltoreq.(1L-M).ltoreq.0.50;
- 0.10.ltoreq.y.ltoreq.0.95 and z.gtoreq.0.90, wherein the particle shape factor f determined from SEM image analyses lies within the limits 0.80.ltoreq.f.ltoreq.0.90 in regard to the mean value f and the associated standard deviation (delta) f is .ltoreq.0.10 and wherein the powders have a residual oxygen content of .ltoreq.0.8% by weight and a free carbon content of .ltoreq.0.1% by weight.
Dependencies are inferred from the claim text.