In the development of advanced ceramic tools, material improvements and design freedom are critical in improving tool performance. However, in the die press molding method, many factors limit tool design and make it difficult to develop innovative advanced tools. Ceramic 3D printing facilitates the production of prototype samples for advanced tool development and the creation of complex tooling products. Furthermore, it is possible to respond to mass production requirements by reflecting the needs of the tool industry, which can be characterized by small quantities of various products. However, many problems remain in ensuring the reliability of ceramic tools for industrial use. In this study, alumina inserts, a representative ceramic tool, was manufactured using the digital light process (DLP), a 3D printing method. Alumina inserts prepared by 3D printing are pressurelessly sintered under the same conditions as coupon-type specimens prepared by press molding. After sintering, a hot isostatic pressing (HIP) treatment is performed to investigate the effects of relative density and microstructure changes on hardness and fracture toughness. Alumina inserts prepared by 3D printing show lower relative densities than coupon specimens prepared by powder molding but indicate similar hardness and higher fracture toughness values.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 토론
4. 결 론
References

• 이현빈(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Hyun-Been Lee (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon))
• 이혜지(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Hye-Ji Lee (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon))
• 김경호(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Kyung-Ho Kim (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon))
• 김경민(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Kyung-Min Kim (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon))
• 류성수(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Sung-Soo Ryu (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon))
• 한윤수(한국세라믹기술원 이천분원 엔지니어링세라믹센터) | Yoonsoo Han (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology (Icheon)) Corresponding Author