| 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 |
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| ABSTRACT |
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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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