Three dimensional (3D) printing technology by direct ink writing (DIW) is an innovative complex shaping technology, possessing advantages of flexibility in fabrication, high efficiency, low cost, and environmental-friendliness. Herein, 3D printing of complex alumina ceramic parts via DIW using thermally induced solidification with carrageenan swelling was investigated. The rheological properties of the slurry under different thermally-induced modes were systematically studied. The solidification properties of thermally-induced pastes with varying contents of carrageenan were optimized. The experimental results showed that the optimized paste consisting of 0.4 wt% carrageenan could be rapidly solidified at about 55 °C, which could print inclined-plane more than 60° in vertical without support, resulting in better homogeneity of the green body. A nearly pore-free structure was obtained after sintering at 1600 °C for 2 h.

中文翻译：

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通过直接墨水书写对倾斜的大型氧化铝陶瓷零件进行3D初步打印

通过直接墨水书写（DIW）进行的三维（3D）打印技术是一种创新的复杂成型技术，具有制造灵活，高效，低成本和环保的优点。在本文中，研究了利用角叉菜胶溶胀的热诱导固化通过DIW进行复杂氧化铝陶瓷零件的3D打印。系统地研究了不同热诱导模式下浆料的流变特性。优化了角叉菜胶含量不同的热诱导糊剂的固化性能。实验结果表明，由0.4 wt％的角叉菜胶制成的优化糊剂可以在约55°C下快速固化，在没有支撑的情况下可以在垂直方向上印刷超过60°的斜面，从而使生坯具有更好的均匀性。