Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Y2O3 and Al2O3 Addition on the Properties of Hot Pressed AlN Ceramics

AlN 세라믹의 hot pressing에 사용되는 Y2O3 및 Al2O3 소결조제의 효과

  • Kong, Man-Sik (Plant Engineering Center, Institute for Advanced Engineering) ;
  • Hong, Hyun-Seon (Plant Engineering Center, Institute for Advanced Engineering) ;
  • Lee, Sung-Kyu (Division of Chemical and Materials Engineering, Ajou Universty) ;
  • Seo, Min-Hye (Plant Engineering Center, Institute for Advanced Engineering) ;
  • Jung, Hang-Chul (Plant Engineering Center, Institute for Advanced Engineering)
  • 공만식 (고등기술연구원 플랜트엔지니어링센터) ;
  • 홍현선 (고등기술연구원 플랜트엔지니어링센터) ;
  • 이성규 ;
  • 서민혜 (고등기술연구원 플랜트엔지니어링센터) ;
  • 정항철 (고등기술연구원 플랜트엔지니어링센터)
  • Published : 2007.10.27
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Abstract

AlN plates were fabricated by hot pressing at $1700-1900^{\circ}C$ using yttria and alumina (3 and $10\;{\mu}m$ particle size) powders as additives and characterized: density, thermal conductivity, transverse rupture strength, and grain size measurement by SEM and EDS. Density values of $3.31-3.34\;g/cm^3$ are largely attributed to hot pressing of powder mixtures in carbon mold under $N_2$ atmosphere which caused effective degree of oxygen removal from yttrium-aluminate phase expected to form at $1100^{\circ}C$. The grain size of hot pressed AlN was almost homogeneous, with size approximately from 3.2 to $4.0\;{\mu}m$ after hot pressing. $Al_2O_3$ powder of $3\;{\mu}m$ particle size resulted in better transverse rupture strength and finer grain size compared to $10\;{\mu}m$ $Al_2O_3$ powder. The thermal conductivity of AlN ranged between $83-92.7\;W/m{\cdot}K$ and decreased with $Al_2O_3$ addition. Fine grain size is preferred for better mechanical properties and thermal conductivity.

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References

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