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A self-propagating high-temperature synthesis method for synthesis of AlN powder

Published online by Cambridge University Press:  31 January 2011

Shyan-Lung Chung ,
Wen-Liang Yu  and
Chun-Nan Lin
Shyan-Lung Chung*
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China
Wen-Liang Yu
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China
Chun-Nan Lin
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China
*
a)Address all correspondence to this author. e-mail: slchung@mail.ncku.edu.tw
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Abstract

A new self-propagating high-temperature synthesis (SHS) process has been developed for synthesis of AlN powder under low nitrogen pressures. Al and NH4X (X = F, Cl, Br, or I) powders were mixed and pressed into a compact, which was placed in a reaction chamber filled with nitrogen. The combustion synthesis reaction was ignited by heating directly the compact, and high product yields (∼90%) were obtained under nitrogen pressures of around 0.5 MPa. The product yield was affected by the reactant composition, the nitrogen pressure, and the compact-forming pressure. The powder as synthesized consists mainly of fibers, coarse granules, and agglomerated fine particles, which become mostly smaller than 10 μm after grinding. A reaction process was also proposed that explains the effects of the experimental parameters on the product yield.

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Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 1928 - 1933
Copyright
Copyright © Materials Research Society 1999

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