Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Pressureless Sintered Nitride Composites in the AlN-Al2O3 System

AlN-Al2O3 계에서의 상압소결 질화물복합체

  • Kim, Young Woo (SOFC Research Project, Research Institute of Industrial Science and Technology) ;
  • Kim, Kyu Heon (School of Materials Science and Engineering, Pusan National University) ;
  • Kim, Dong Hyun (School of Materials Science and Engineering, Pusan National University) ;
  • Yoon, Seog Young (School of Materials Science and Engineering, Pusan National University) ;
  • Park, Hong Chae (School of Materials Science and Engineering, Pusan National University)
  • 김영우 (포항산업과학연구원 SOFC연구단) ;
  • 김규헌 (부산대학교 재료공학부) ;
  • 김동현 (부산대학교 재료공학부) ;
  • 윤석영 (부산대학교 재료공학부) ;
  • 박홍채 (부산대학교 재료공학부)
  • Received : 2014.07.11
  • Accepted : 2014.09.02
  • Published : 2014.09.30
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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.

Keywords

References

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