Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Effects of Magnesium Catalyst on the Nitridation of Aluminum Melt in the Synthesis of Aluminum Nitride Powder

  • Kim, Hyo-Jin (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Kim, Sung-Hun (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Lim, Sung-Min (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Seo, Jong-Hyun (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Lee, Kon-Bae (School of Advanced Materials Engineering, Kookmin University) ;
  • Lee, Jae-Chul (Department of Materials Science and Engineering, Korea University) ;
  • Ahn, Jae-Pyoung (Advanced Analysis Center, Korea Institute of Science and Technology)
  • Received : 2014.06.11
  • Accepted : 2014.06.27
  • Published : 2014.06.30
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Abstract

Aluminum nitride (AlN) powder was easily synthesized by the direct nitridation of Al melt containing ~20 wt.% Mg catalyst and the nitriding behavior was investigated by thermodynamic calculation and through observations of electron microscopy and X-ray diffraction. The addition of Mg catalyst decreased the nitriding temperature below $1,000^{\circ}C$, which is comparable to the high nitriding temperature of $1,400^{\circ}C$ required in carbothermal method. It was caused by a significant increase of the solubility of nitrogen gas due to the increase of Mg catalyst in Al melt. The dissolved nitrogen gas met Mg catalyst and was transformed into metastable $Mg_3N_2$. Finally the metastable phase reacted with Al to AlN.

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References

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