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http://dx.doi.org/10.4150/KPMI.2005.12.3.214

Effect of Mechanical Alloying Atmosphere on Formation of AlN  

Yu Seung-Hoon (School of Materials Science and Engineering, Seoul National University)
Lee Young Sung (School of Materials Science and Engineering, Seoul National University)
Shin Kwang-Seon (School of Materials Science and Engineering, Seoul National University)
Publication Information
Journal of Powder Materials / v.12, no.3, 2005 , pp. 214-219 More about this Journal
Abstract
In order to investigate the formation of AlN, mechanical alloying was carried out in $N_2$ and $NH_3$ atmosphere. Differential thermal analysis (DTA), x-ray diffraction (XRD) and chemical analysis were carried out to examine the formation behavior of aluminum nitrides. No diffraction pattern of AlN was observed in XRD analysis of the as-milled powders in $NH_3\;or\;N_2$ atmosphere. However, DTA and chemical analysis indicated that the precursors for AlN were formed in the Al powders milled in $NH_3$ atmosphere. The AlN precursors transformed to AlN after heat treatment at and above $600^{\circ}C$. It was considered that the reaction between Al and $NH_3$ was possible by the formation of fresh Al surface during mechanical alloying of Al powders.
Keywords
Aluminum nitride; Mechanical alloying; Direct nitridation;
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