In this study, a process is developed for 3D printing with alumina (Al2O3). First, a photocurable slurry made from nanoparticle Al2O3 powder is mixed with hexanediol diacrylate binder and phenylbis(2,4,6- trimethylbenzoyl) phosphine oxide photoinitiator. The optimum solid content of Al2O3 is determined by measuring the rheological properties of the slurry. Then, green bodies of Al2O3 with different photoinitiator contents and UV exposure times are fabricated with a digital light processing (DLP) 3D printer. The dimensional accuracy of the printed Al2O3 green bodies and the number of defects are evaluated by carefully measuring the samples and imaging them with a scanning electron microscope. The optimum photoinitiator content and exposure time are 0.5 wt% and 0.8 s, respectively. These results show that Al2O3 products of various sizes and shapes can be fabricated by DLP 3D printing.

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

• 김경민(한국세라믹기술원 엔지니어링세라믹센터, 한양대학교 신소재공학부) | Kyung Min Kim (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Department of Materials Science and Engineering, Hanyang University)
• 정현덕(한국세라믹기술원 엔지니어링세라믹센터) | Hyeondeok Jeong (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
• 한윤수(한국세라믹기술원 엔지니어링세라믹센터) | Yoon Soo Han (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
• 백수현(한국세라믹기술원 엔지니어링세라믹센터, 한양대학교 신소재공학부) | Su-Hyun Baek (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Department of Materials Science and Engineering, Hanyang University)
• 김영도(한양대학교 신소재공학부) | Young Do Kim (Department of Materials Science and Engineering, Hanyang University)
• 류성수(한국세라믹기술원 엔지니어링세라믹센터) | Sung-Soo Ryu (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) Corresponding Author