| 초록 |
3D printing technology recently attracts significant amount of attention due to its potential to easily fabricate complex designs of diverse products. This technical convenience leads to the step where 3D printing technology is considered as an innovative and simple way of manufacturing ceramic-based functional components. In this technique, ceramic suspensions were formulated by incorporating various functional additives to impart the viscoelastic properties. This viscoelastic property of the suspension plays a critical role in printing and maintaining the 3D shape of the ceramic structures. The correlation of viscoelastic property with 3D printability will be addressed in depth in this study. The extrusion based Direct ink writing(DIW) was demonstrated by 3D printed electronic components and several structures. However, due to the inherent limitations of ceramic loading to the suspension, it causes around 15-20% linear shrinkage after the sintering process. The shrinkage leads to a constraint of the design for ceramic functional component. In addition, we conducted a study on ways to minimize the shrinkage through near-net-shape suspension. The near-net-shape suspension fills the pores formed by the large particles, therefore minimizing the porosity of the 3D printed ceramic structure. As a result, a near-net-shape suspension can have a high green density, which reduces shrinkage during sintering to prevent damage to the 3D printed structures and is easily designed. This approach achieves the best performance in the final ceramic component, and its easy-to-use design path makes it highly desirable for a variety of structural, functional, and biomedical industry applications. |
