| 희석제 입도가 고온자전연소법에 의한 질화알루미늄 합성에 미치는 영향 |
| 이재령, 이익규, 신희영, 정헌생 |
| 한국지질자원연구원 자원활용소재연구부 |
| Effect of Diluent Size on Aluminum Nitride Prepared by Using Self-Propagating High-Temperature Synthesis Process |
| Jae-Ryeong Lee, Ik-Kyu Lee, Hee-Young Shin, Hun-Saeng Chung |
| Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources |
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| ABSTRACT |
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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. |
| Key words:
SHS method, Diluent size, Reactant shape, AIN |
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