In this paper, an alumina ink with good rheological properties was successfully prepared using pseudoboehmite as the main component, nitric acid as the colloidal solvent, and sesbania powder as the lubricant. The impact of nine different ink formulations, namely, Ink1 to Ink9, on the printability and rheological features of the ink was investigated. Consequently, it was found that Ink3 with 5 wt % nitric acid and 5 wt % sesbania powder exhibited the most favorable formability. This ink was utilized to fabricate alumina samples with direct ink writing (DIW) three-dimensional (3D) printing technology. The printed alumina samples were characterized using an automatic Brunauer–Emmett–Teller, X-ray diffractometer, Fourier transform infrared spectroscopy, and scanning electron microscope. To obtain the optimal printing parameters, a three-factor and three-level orthogonal test was designed to research the influences of different 3D printing parameters (filling ratio, nozzle diameter, and layer thickness) on the specific surface area, pore characteristics (size and volume), and radial crushing strength of the alumina specimens. The primary and secondary orders of the effects on the radial crushing strength and pore structure were determined through analysis of the experimental data. The experimental results showed that the alumina sample with a filling ratio of 80%, nozzle diameter of 0.6 mm, and layer thickness of 0.3 mm was found to have better strength of 48.07 ± 9.53 N/mm and specific surface area of 185.7315 m²/g. This study provides a theoretical base for the preparation of alumina carriers by DIW 3D printing.

中文翻译：

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基于正交试验的氧化铝陶瓷3D打印参数优化

本文以拟薄水铝石为主要成分，硝酸为胶体溶剂，田菁粉为润滑剂，成功制备了一种具有良好流变性能的氧化铝墨水。研究了九种不同油墨配方（即 Ink1 至 Ink9）对油墨印刷适性和流变特性的影响。结果发现，含有5重量％硝酸和5重量％田菁粉末的Ink3表现出最有利的成形性。该墨水用于通过直接墨水书写 (DIW) 三维 (3D) 打印技术制造氧化铝样品。使用自动 Brunauer-Emmett-Teller、X 射线衍射仪、傅里叶变换红外光谱仪和扫描电子显微镜对印刷的氧化铝样品进行表征。为了获得最佳打印参数，设计了三因素三水平正交试验，研究不同3D打印参数（填充率、喷嘴直径、层厚）对比表面积、孔隙特性（尺寸和孔径）的影响。体积）和氧化铝样品的径向抗压强度。通过对实验数据的分析，确定了对径向抗压强度和孔隙结构影响的主次顺序。实验结果表明，填充率为80%、喷嘴直径为0.6 mm、层厚为0.3 mm的氧化铝样品具有较好的强度，为48.07±9.53 N/mm，比表面积为185.7315 m ² / G。该研究为DIW 3D打印制备氧化铝载体提供了理论基础。