US5389585A
Expired / Lapsed
US
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Fine non-oxide ceramic powders
Assignee: H.C. Starck GmbH
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Filing: 1993-04-26
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Granted: 1995-02-14
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Expires: 2013-04-26
Abstract
Abstract The invention relates to fine non-oxide ceramic powders MeX, wherein Me=B, Al, Si, Ti, Zr, Hf, V, Y, Ta, Nb, Mo, W, La, Fe, Co, Ni and/or Cr and X=C, N, B and Si or combinations thereof, with the exception of Si 3 N 4 greater than 100 nm and AlN greater than 200 nm.
Inventors
- 👤 Theo Konig
- 👤 Dietmar Fister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:08
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/921; C04; C04B; C04B35/00; B; B01; B01J; B01J12/00; B01J12/02; B82; B82Y; B82Y30/00; C01B21/00; C01B21/06; C01B21/076; C01B21/0763; C01B33/00; C01B33/06; C01B35/00; C01B35/02; C01B35/04; C04B35/515; C04B35/56; C04B35/58; C01P; C01P2004/00; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
Fine non-oxide ceramic powders MeX, wherein Me=at least one of B, Al, Si, Ti, Zr, Hf, V, Y, Ta, Nb, Mo, W, La, Fe, Co, Ni and Cr and X=at least one of C, N, B and Si wherein the powders exhibit a particle size between 1.0 nm and 500 nm, with the proviso that when MeX is Si 3 N 4 the particle size is between 1.0 nm and 100 nm and when MeX is AlN the particle size is between 1.0 nm and 200 nm, and further wherein fewer than 1% of the individual particles exhibit a deviation of more than 40% and no individual particles exhibit a deviation of more than 60% from the average particle size of the powders.
Claim 2
Dependent Claim
123 words
Fine non-oxide ceramic powders MeX, wherein Me=at least one of B, Al, Si, Ti, Zr, Hf, V, Y, Ta, Nb, Mo, W, La, Fe, Co, Ni and Cr and X=at least one of C, N, B and Si wherein the powders exhibit a particle size between 1.0 nm and 500 nm, with the proviso that when MeX is Si 3 N 4 the particle size is between 1.0 nm and 100 nm and when MeX is AlN the particle size is between 1.0 nm and 200 nm, and further wherein fewer than 1% of the individual particles exhibit a deviation of more than 40% and no individual particles exhibit a deviation of more than 60% from the average particle size of the powders.
Claim 3
Dependent Claim
36 words
Powders according to claim 1, wherein fewer than 1% of the individual particles exhibit a deviation of more than 20% and no individual particles exhibit a deviation of more than 50% from the average particle size.
Claim 4
Dependent Claim
36 words
Powders according to claim 1, wherein fewer than 1% of the individual particles exhibit a deviation of more than 10% and no individual particles exhibit a deviation of more than 40% from the average particle size.
Claim 5
Dependent Claim
18 words
Powders according to claim 1, wherein the particle size ranges from 1 nm to less than 100 nm.
Claim 6
Dependent Claim
18 words
Powders according to claim 1, wherein the particle size ranges from 1 nm to less than 50 nm.
Claim 7
Dependent Claim
27 words
Powders according to claim 1, wherein the non-oxide ceramic powders are WC, SiC, B 4 C, ZrC, VC, HfC, Mo 2 C, Cr 3 C 2 .
Claim 8
Dependent Claim
36 words
Powders according to claim 1, wherein the non-oxide ceramic powders comprise a nitride of at least one element selected from the group consisting of B, Al, Si, Ti, Zr, Hf, V, Nb, Ta, Mo and W.
Claim 9
Dependent Claim
17 words
Powders according to claim 1, wherein the powders have an oxygen content of less than 5000 ppm.
Claim 10
Dependent Claim
17 words
Powders according to claim 1, wherein the powders have an oxygen content of less than 1000 ppm.
Claim 11
Dependent Claim
17 words
Powders according to claim 1, wherein the powders have an oxygen content of less than 100 ppm.
Claim 12
Dependent Claim
26 words
Powders according to claim 1, wherein the sum total of contaminants in the powders, with the exception of oxidic contaminants, amounts to less than 5000 ppm.
Claim 13
Dependent Claim
26 words
Powders according to claim 1, wherein the sum total of contaminants in the powders, with the exception of oxidic contaminants, amounts to less than 1000 ppm.
Claim 14
Dependent Claim
26 words
Powders according to claim 1, wherein the sum total of contaminants in the powders, with the exception of oxidic contaminants, amounts to less than 200 ppm.
Claim 15
Dependent Claim
17 words
Powders according to claim 1, wherein the powders are produced in quantities in excess of 1 kg.
Claim 16
Dependent Claim
17 words
Powders according to claim 1, wherein the powders have an oxygen content of less than 50 ppm.
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