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http://dx.doi.org/10.4191/KCERS.2009.46.4.392

Transparency of AlON Fabricated by Pressureless Reaction Sintering Using Various Sintering Aids  

Koo, Bon-Kyung (Department of Materials Science and Engineering, Yeungnam University)
Koo, Kyeo-Hun (Department of Materials Science and Engineering, Yeungnam University)
Kim, Ji-Hye (Department of Materials Science and Engineering, Yeungnam University)
Jung, In-Chul (Department of Materials Science and Engineering, Yeungnam University)
Lee, Jae-Hyung (Department of Materials Science and Engineering, Yeungnam University)
Publication Information
Journal of the Korean Ceramic Society / v.46, no.4, 2009 , pp. 392-396 More about this Journal
Abstract
AlON was fabricated by the pressureless reaction sintering of $Al_2O_3$-AlN powder mixtures. The ratio of AlN to $Al_2O_3$ as well as various sintering aids were the main variables for this study. The optimum ratio of AlN in the $Al_2O_3$-AlN mixture was approximately 35.0 mol%. For the sintering aids, only when a small amount of MgO was added together with $Y_2O_3$ and BN, AlON specimens could be sintered to a full density with negligible pores and high transparency. Other combinations of $Y_2O_3$, BN, CaO and MgO resulted in enough pores in the sintered specimens to have in-line transmittance only between 0% and 30%. The in-line transmittance reached over 80% after sintering at $1975^{\circ}C$ for 10 h for the specimen containing 0.15 wt% MgO, 0.08 wt% $Y_2O_3$ and 0.02 wt% BN.
Keywords
AlON; Transmittance; Reaction sintering; Sintering aids; Porosity;
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