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J. Korean Ceram. Soc. > Volume 51(5); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(5): 498.
doi: https://doi.org/10.4191/kcers.2014.51.5.498
AlN-Al2O3 계에서의 상압소결 질화물복합체
김영우, 김규헌1, 김동현1, 윤석영1, 박홍채1
포항산업과학연구원 SOFC연구단
1부산대학교 재료공학부
Pressureless Sintered Nitride Composites in the AlN-Al2O3 System
Young Woo Kim, Kyu Heon Kim1, Dong Hyun Kim1, Seog Young Yoon1, Hong Chae Park1
SOFC Research Project, Research Institute of Industrial Science and Technology
1School of Materials Science and Engineering, Pusan National University
ABSTRACT
Particulate nitride composites have been fabricated by sintering the compacted powder of AlN and 5 - 64.3 mol% $Al_2O_3$, with a small addition of $Y_2O_3$ ($Y_2O_3$/AlN, 1 wt%), in 1-atm nitrogen gas at $1650-1900^{circ}C$. The composites were characterized in terms of sintering behavior, phase relations, microstructure and thermal shock resistance. AlN, 27R AlN pseudopolytype, and alminium oxynitride (AlON, $5AlN{cdot}9Al_2O_3$) were found to existin the sintered material. Regardless of batch composition, the AlN-$Al_2O_3$ powder compacts exhibited similar sintering behavior; however, the degree of shrinkage commonly increased with increasing $Al_2O_3$ content, consequently giving high sintered bulk density. By increasing the $Al_2O_3$ addition up to ${geq}50 mol%$, the matrix phase in the sintered material was converted from AlN or 27R to AlON. Above $1850^{circ}C$, a liquid phase was formed by the reaction of $Al_2O_3$ with AlN, aided by $Y_2O_3$ and mainly existed at the grain boundaries of AlON. Thermal shock resistance was superior in the sintered composite consisting of AlON with dispersed AlN or AlN matrix phase.
Key words: AlN, AlON, Sintering behavior, Thermal shock resistance
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