High purity aluminum nitride of controlled morphology

Details High purity aluminum nitride of controlled morphology High purity aluminum nitride of controlled morphology

C - Chemistry, Metallurgy

01

B

23/223

C01B 21/072 (2006.01) C04B 35/581 (2006.01)

Patent

CA 1334475

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 liquid medium from the frozen suspension.

546037

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