Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Materials Extrusion for Dense Ceramic Additive Manufacturing with Sol-gel Al2O3 Feedstock

Hyuk Hur1, Yu Jin Park1, Dong-Hyun Kim1, JIyong Park2, Kyung Il Kim3 and Jong Wan Ko1,a

13D Printing Manufacturing Process Center, Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, 40, Techno saneop-ro 29beon-gil, Nam-gu, Ulsan, Republic of Korea (44776)

2Advanced Joining & Additive Manufacturing R&D Department, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-Gu, Incheon, Korea (21999)

3Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-Gu, Incheon, Korea (21999)


A novel strategy for highly dense additive manufacturing using a sol-gel-based ceramic slurry without polymeric additives is presented. Alumina, which is the most widely used fine ceramic, was chosen as a representative ceramic material. The proposed sol-gel solution enabled a high solid loading of approximately 50 vol. % without any polymeric dispersant while satisfying the requirements for material extrusion process, such as extrudable viscosity (< 100 Pa.s) and self-sustainable yield stress. The as-printed green body possessed high alumina content and 66% of theoretical density, which was higher than that obtained via the conventional molding methods. A reduced linear shrinkage of less than 16% and a high density of 99.5% of the theoretical value were also achieved. This research would present a practical strategy for ceramic additive manufacturing as an emerging fabrication process.

Keywords: 3D Printing, Additive manufacturing, Ceramics, Material extrusion, Al2O3

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