Compositions: ceramic – Ceramic compositions – Refractory
Patent
1993-09-08
1995-03-28
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 88, 501 94, 501127, 423412, C04B 3558
Patent
active
054016975
ABSTRACT:
A method of processing water-sensitive ceramic powders, particularly carbothermically produced aluminum nitride, whereby the ceramic powder is deagglomerated in a dry milling step with addition of an alkylamine which is liquid at room temperature is disclosed. The alkylamine is added in an amount sufficient to produce a monomolecular layer on the surface of the ceramic powder. The deagglomerated powder subsequently is vigorously stirred with a concentrated aqueous solution or dispersion of binder and rapidly and gently dried, preferably by freeze drying. Aluminum nitride powder prepared by this process can be further processed into shaped parts with a high thermal conductivity.
REFERENCES:
patent: 4540677 (1985-09-01), Enomoto et al.
patent: 5049367 (1991-09-01), Nakano et al.
Patent Abstracts of Japan, vol. 013, No. 021 (C-560)18. Jan. 1989 & JP-A-63 225 507, Sep. 1988.
Chemical Abstracts, vol. 111, No. 6, Aug. 7, 1989, U.S. Abstract No. 44266f, "Free Flowing Granulated . . . ", & JP-A-1 061 362, Mar. 8, 1989.
Database WPI, Section Ch, Week 9104, Derwent Publications Ltd., London, GB; Class A32, AN91-026261 & JP-A-2 296 708, Dec. 7, 1990.
Patent Abstracts of Japan, JP2088412, Mar. 28, 1990, & JP880238421, Sep. 22, 1988.
Guether Hans-Michael
Hessel Friedrich
Koestler Christine
Roosen Andreas
Schroeder Frank
Group Karl
Hoechst Aktiengesellschaft
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