Comparison of the carbothermal reduction and nitridation reactivity among gamma-, delta-, and alpha-Al2O3

Title
Comparison of the carbothermal reduction and nitridation reactivity among gamma-, delta-, and alpha-Al2O3
Author(s)
정우식
Keywords
ALUMINUM NITRIDE; COMPLEXES; POWDER
Issue Date
201002
Publisher
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
Citation
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, v.118, no.1374, pp.132 - 136
Abstract
The carbothermal reduction and nitridation (CRN) reactivity of alumina (Al2O3) to aluminum nitride (AlN) under a flow of nitrogen was investigated for transition aluminas (gamma- and (delta-Al2O3) and alpha-Al2O3 with the same particle size and mixing homogeneity with carbon. The aluminas were obtained by calcining a (hydroxo)(succinato)Al(III) complex under a flow of nitrogen, argon, or mixed gas of nitrogen and carbon monoxide. The transition aluminas were converted to AlN without any transformation into alpha-Al2O3. The CRN reactivity of Al2O3 decreased in the following order: gamma-Al2O3 > delta-Al2O3 >> alpha-Al2O3. The difference in their CRN reactivities was attributed to the difference in the ratio of AlO4 sites to AlO6 sites among the three phases. The CRN reactivity decreased with increasing crystallinity. (C) 2010 The Ceramic Society of Japan. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/22910http://dx.doi.org/10.2109/jcersj2.118.132
ISSN
1882-0743
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공과대학 > 화학공학부 > Articles
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