Hydrolysis Control of AlN Powders for the Aqueous Processing of Spherical AlN Granules
authors Wang, Q; Olhero, SM; Ferreira, JMF; Cui, W; Chen, KX; Xie, ZP
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords ALUMINUM NITRIDE POWDER; GAS-REDUCTION-NITRIDATION; THERMAL-CONDUCTIVITY; CERAMICS; PARTICLES; PHOSPHATE; DEGRADATION; GRANULATION; SUSPENSIONS; PROTECTION
abstract Spherical granules of aluminum nitride (AlN) with an average particle size of about 50m were produced from aqueous suspensions using an AlN powder surface treated against hydrolysis with aluminum dihydrogenphosphate [Al(H2PO4)3]. Two different amounts of Al(H2PO4)3 were tested and the effects of surface treatment and aging time were evaluated by various techniques (XRD, TG-DTA, zeta potential and pH measurements). The treated powder exhibited antihydrolytic property and good dispersing behavior, enabling the preparation of low-viscosity and high-concentration aqueous AlN slurries for freeze granulation. The spherical AlN granules were sintered in a boron nitride (BN) powder bed followed by ultrasonic washing of the AlN granulates/BN mixture to remove BN. The sintered spherical AlN granules present excellent crystallinity and high sphericity as observed from SEM micrographs.
publisher WILEY-BLACKWELL
issn 0002-7820
year published 2013
volume 96
issue 5
beginning page 1383
ending page 1389
digital object identifier (doi) 10.1111/jace.12288
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000318801400011
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journal impact factor 3.502
5 year journal impact factor 3.475
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