Suppressed Reactivity of AlN Powder in Water at 5°C

The hydrolysis behavior of AlN powder suspensions (5–25 wt%) at 5°C has been investigated to explore the impact of low temperatures on the hydrolysis behavior. Throughout the 312‐h long experiment, the pH value of the suspensions was below 9, where the hydrolysis remained in the induction period and...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2013-04, Vol.96 (4), p.1032-1034
Main Authors: Kocjan, Andraž, Dakskobler, Aleš, Budič, Bojan, Kosmač, Tomaž
Format: Article
Language:English
Subjects:
Aluminium hydroxide
Aluminum nitride
Aqueous solutions
Ceramics
Dissolution
Hydrolysis
Low temperature physics
Passivation
Thin films
Water
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Summary:The hydrolysis behavior of AlN powder suspensions (5–25 wt%) at 5°C has been investigated to explore the impact of low temperatures on the hydrolysis behavior. Throughout the 312‐h long experiment, the pH value of the suspensions was below 9, where the hydrolysis remained in the induction period and was eventually suppressed due to the formation of a few‐nanometers‐thick film of amorphous aluminum hydroxide gel around the AlN particles, acting as a passivation layer. Moreover, the aqueous part of the suspension possessed a remarkably high value of dissolved [Al(III)]aq, being an order of magnitude higher at a given pH value than the aqueous AlCl3 solution.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12237