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A novel process for combustion synthesis of AlN powder

Published online by Cambridge University Press:  03 March 2011

Wei-Chang Lee ,
Chang-Lin Tu ,
Chang-Yueh Weng  and
Shyan-Lung Chung
Wei-Chang Lee
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
Chang-Lin Tu
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
Chang-Yueh Weng
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
Shyan-Lung Chung*
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China
*
a)Author to whom all correspondence should be addressed.
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Abstract

A SHS process has been established for synthesis of AlN powder under low nitrogen pressures. Al and NaN3 powders were used as the metal and nitrogen sources, respectively. The compact of the mixture of the reactants was wrapped up with aluminum foil and then wrapped up with an igniting agent (i.e., Ti + C). The synthesis reaction was triggered by the combustion of the igniting agent. The wrappings were found necessary in achieving high product conversions under low nitrogen pressures (<1 MPa). The product conversion was also affected by the reactant composition and the nitrogen pressure. High conversions were obtained when the mass ratio of Al to NaN3 was 1/2 or lower and the nitrogen pressure was 0.5 MPa or higher. The AlN powders as synthesized were observed to have two major types of morphology, i.e., granular particles with 0.5–3 μm in diameter and fibers with aspect ratios of 10–800.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 3 , March 1995 , pp. 774 - 778
Copyright
Copyright © Materials Research Society 1995

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References

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