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http://dx.doi.org/10.4191/KCERS.2005.42.1.069

Effect of Diluent Size on Aluminum Nitride Prepared by Using Self-Propagating High-Temperature Synthesis Process  

Lee, Jae-Ryeong (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Ik-Kyu (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Shin, Hee-Young (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Chung, Hun-Saeng (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.1, 2005 , pp. 69-75 More about this Journal
Abstract
To investigate the morphological effect on synthesis of aluminum nitride by SHS Process, two type of Al Powder (granular and flacky shape) with the mean size of 34 $\mu$m and the diluent AIN powders of four different mean sizes.0.12, 9.7, 39.3, 50.5 $\mu$m, were used to prepare green compact. The packing density was fixed to $35 TD\%. The initial pressure of $N_{2}$ and diluent fraction was varied in the range of $1\~10 MPa,\;0.4\~0.7$, respectively. AlN with high purity of $98\% or over and large particle size of about several tens fm can be synthesized by SHS reaction as a consequence of adjusting particle size of AlN dilutent similarly to that of Al reactant. This may be caused by improvement of $N_{2}$ gas permeation to compact after passing the propagation wave. In the case of flaky-shape aluminum used as reactant, instead of granular Al-powder, unstable combustion would be occurred. As the result, irregular propagation of combustion wave and falling-off of maximum temperature would be observed during the reaction.
Keywords
SHS method; Diluent size; Reactant shape; AIN;
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