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J. Korean Ceram. Soc. > Volume 41(2); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(2): 118.
doi: https://doi.org/10.4191/kcers.2004.41.2.118
탄소환원질화법을 이용한 AIN Whisker의 합성 I. 불화물 첨가의 영향
양성구, 강종봉1
경남대학교 공동기기센터
1경남대학교 신소재공학부
Synthesis of Aluminum Nitride Whisker by Carbothermal Reaction I. Effect of Fluoride Addition
ABSTRACT
The properties of AlN made by carbothermal reaction depend on the starting materials, quantity of liquid, the liquid-vapor phase reaction, the N$_2$ flow rate, and the reaction temperature. AlN whisker was synthesized by the VLS and VS methods. Solid ${alpha}$-A1$_2$O$_3$(AES-11) was carbothermally reduced with carbon black in a high-purity N$_2$ atmosphere with AlF$_3$ to cause whisker grown and additional aluminum liquid to increase whisker yield. Aluminum nitride was perfectly formed at reaction temperatures of 1600$^{circ}C$. At reaction temperature higher than 1600$^{circ}C$ the aluminum nitride was completely formed, while the composition remains unaffected. Needle-shaped whiskers formed best at 1600$^{circ}C$ while higher temperatures disrupted whisker formation. Adding 0 to 15 wt% aluminum to the synthesis favorably affects the microstructure for formation of needle-shaped AlN whisker. Additions over 15 wt% degraded formation of AlN whisker.
Key words: Aluminum nitride, Carbothermal reaction, Needle-shaped whisker
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