Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of MgO-CaO-Al2O3-SiO2 Glass Additive Content on Properties of Aluminum Nitride Ceramics

MgO-CaO-Al2O3-SiO2 glass 첨가제 함량이 AlN의 물성에 미치는 영향

  • Kim, Kyung Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Baik, Su-Hyun (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Ryu, Sung-Soo (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
  • 김경민 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 백수현 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 류성수 (한국세라믹기술원 엔지니어링세라믹센터)
  • Received : 2018.11.28
  • Accepted : 2018.12.20
  • Published : 2018.12.28
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Abstract

In this study, the effect of the content of $MgO-CaO-Al_2O_3-SiO_2$ (MCAS) glass additives on the properties of AlN ceramics is investigated. Dilatometric analysis and isothermal sintering for AlN compacts with MCAS contents varying between 5 and 20 wt% are carried out at temperatures ranging up to $1600^{\circ}C$. The results showed that the shrinkage of the AlN specimens increases with increasing MCAS content, and that full densification can be obtained irrespective of the MCAS content. Moreover, properties of the AlN-MCAS specimens such as microhardness, thermal conductivity, dielectric constant, and dielectric loss are analyzed. Microhardness and thermal conductivity decrease with increasing MCAS content. An acceptable candidate for AlN application is obtained: an AlN-MCAS composite with a thermal conductivity over $70W/m{\cdot}K$ and a dielectric loss tangent (tan ${\delta}$) below $0.6{\times}10^{-3}$, with up to 10 wt% MCAS content.

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References

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