| 소결조제를 달리해 상압 반응소결로 제조된 AlON의 투명도 |
| 구본경, 구교헌, 김지혜, 정인철, 이재형 |
| 영남대학교 신소재공학부 |
| Transparency of AlON Fabricated by Pressureless Reaction Sintering Using Various Sintering Aids |
| Bon-Kyung Koo, Kyeo-Hun Koo, Ji-Hye Kim, In-Chul Jung, Jae-Hyung Lee |
| Department of Materials Science and Engineering, Yeungnam University |
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| ABSTRACT |
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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. |
| Key words:
AlON, Transmittance, Reaction sintering, Sintering aids, Porosity |
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