Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effects of Sintering Additives on the Thermal and Mechanical Properties of AlN by Pressureless Sintering

상압소결 질화알루미늄의 소결 첨가제 변화에 따른 열적 및 기계적 특성

  • Hwang, Jin Uk (Fibrous Ceramics & Aerospace Materials Center, Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Mun, So Youn (Fibrous Ceramics & Aerospace Materials Center, Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Nam, Sang Yong (Functional nano lab. Department of polymer engineering, Gyeongsang National University) ;
  • Dow, Hwan Soo (Fibrous Ceramics & Aerospace Materials Center, Convergence R&D Division, Korea Institute of Ceramic Engineering & Technology)
  • Received : 2019.10.07
  • Accepted : 2019.10.21
  • Published : 2019.10.28
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Abstract

Aluminum nitride (AlN) has excellent electrical insulation property, high thermal conductivity, and a low thermal expansion coefficient; therefore, it is widely used as a heat sink, heat-conductive filler, and heat dissipation substrate. However, it is well known that the AlN-based materials have disadvantages such as low sinterability and poor mechanical properties. In this study, the effects of addition of various amounts (1-6 wt.%) of sintering additives $Y_2O_3$ and $Sm_2O_3$ on the thermal and mechanical properties of AlN samples pressureless sintered at $1850^{\circ}C$ in an $N_2$ atmosphere for a holding time of 2 h are examined. All AlN samples exhibit relative densities of more than 97%. It showed that the higher thermal conductivity as the $Y_2O_3$ content increased than the $Sm_2O_3$ additive, whereas all AlN samples exhibited higher mechanical properties as $Sm_2O_3$ content increased. The formation of secondary phases by reaction of $Y_2O_3$, $Sm_2O_3$ with oxygen from AlN lattice influenced the thermal and mechanical properties of AlN samples due to the reaction of the oxygen contents in AlN lattice.

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