Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1989-12-21
1992-11-17
Langel, Wayne
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
23293R, 23305A, 423412, 428328, 428698, 501 96, 501153, 556176, B32B 516, C01B 21072, C07F 506
Patent
active
051642638
ABSTRACT:
Methods are described for preparing aluminum nitride of controllable morphology for ceramic and heat conduction applications. The methods comprise forming spherical particles or flakes of an intermediate, RAlNH, followed by heating the spheres or flakes of RAlNH at elevated temperatures to produce high purity aluminum nitride of corresponding morphology. Spheres of RAlNH are formed by (i) freezing a suspension of RAlNH in a liquid medium and thawing, by (ii) aging the suspension, or by (iii) dissolving RAlNH in a liquid medium and precipitating it. Flakes are formed by freezing a suspension of RAlNH in a liquid medium and removing frozen medium from the frozen suspension.
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Bolt John D.
Mahler Walter
Tebbe Frederick N.
Young, Jr. Robert J.
E. I. Du Pont de Nemours & Co.
Hamby William H.
Langel Wayne
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