ABSTRACT

UV-curable particle-free ceramic compositions for stereolithography-based 3D printing technologies present a promising alternative to the commonly used particle-based compositions. So far, such compositions were mainly based on solutions of pre-ceramic polymers which limit their applications to silicon-containing materials. However, the application of particle-free inks for the fabrication of other ceramic materials, in particular dense polycrystalline ones, is very little explored. We present a new and general fabrication approach based on all-solution compositions, by combining sol–gel chemistry and photopolymerization, for obtaining dense 3D ceramic structures by DLP printing. The process is demonstrated here for the fabrication of barium titanate (BaTiO₃). By using chelating solvent and monomer, a stable UV-curable solution is obtained. An aging period of 8–14 days was crucial for obtaining dense ceramic objects without any secondary phases. The heat treatment was found to affect the microstructure, density and hardness of the resulting ceramics. The presented process enables obtaining objects free of carbon materials, having a density as high as 98% of the theoretical value, and a hardness of 4.3 GPa.

摘要

用于基于立体平版印刷的3D打印技术的无紫外线固化的无颗粒陶瓷组合物提供了一种常用的基于颗粒的组合物的有前途的替代方法。迄今为止，这种组合物主要基于预陶瓷聚合物的溶液，这限制了它们在含硅材料中的应用。然而，很少探索将无颗粒油墨用于制造其他陶瓷材料，特别是致密的多晶材料。我们提出了一种基于全溶液成分的新型通用制造方法，通过结合溶胶-凝胶化学和光聚合，可以通过DLP印刷获得致密的3D陶瓷结构。此处演示了钛酸钡（BaTiO ₃）。通过使用螯合溶剂和单体，可以获得稳定的紫外线固化溶液。8–14天的老化时间对于获得没有任何第二相的致密陶瓷物体至关重要。发现热处理会影响所得陶瓷的微观结构，密度和硬度。提出的方法能够获得不含碳材料的物体，其具有高达理论值的98％的密度和4.3 GPa的硬度。