Digital light processing (DLP) technology has presented great potential to fabricate ceramic structures including alumina component, yet the mechanical properties of DLP-manufactured ceramics are still difficult to be guaranteed. The enhancement of mechanical properties of DLP-fabricated ceramic materials is challenging and imperative in the field of industrial application. This paper investigates the printing and heat treatment processes of additively manufactured ceramic to achieve defect-free Al₂O₃ ceramic with high performance. Firstly, Al₂O₃ ceramic slurry with a high solid content of 55 vol.% and viscosity of 6.04 Pa·s (at the shear rate of 100 s⁻¹) is prepared. Then, Al₂O₃ ceramic is manufactured with digital light processing, debinding and sintering processes sequentially. Thirdly, the effects of sintering temperatures on the shrinkage, density, microstructure, and mechanical properties of the Al₂O₃ ceramics are analyzed. The shrinkage, density, and flexural strength of the sintered ceramic increase with temperature; the microhardness shows a non-monotonic trend with the increase of sintering temperature. Finally, the influence mechanism of sintering temperature on microstructures and mechanical properties of the DLP-fabricated ceramics is interpreted and discussed. The ceramic grains grow and combine to form long columnar grains during higher sintering temperatures. The density, microhardness and flexural strength of the Al₂O₃ ceramics sintered at 1600 °C are achieved 3.51 g/cm³, 17.71 GPa and 175.8 MPa, respectively.

数字光处理 (DLP) 技术在制造包括氧化铝成分在内的陶瓷结构方面具有巨大潜力，但 DLP 制造的陶瓷的机械性能仍难以得到保证。提高DLP制造的陶瓷材料的机械性能在工业应用领域具有挑战性和必要性。本文研究了增材制造陶瓷的印刷和热处理工艺，以实现无缺陷的高性能Al ₂ O _3陶瓷。首先，制备高固含量55vol.%、粘度6.04Pa·s(剪切速率100s ^-1 )的Al ₂ O _{3陶瓷浆料。}那么，Al ₂ O₃陶瓷采用数字光处理、脱脂和烧结工艺依次制造。第三，分析了烧结温度对Al ₂ O ₃陶瓷的收缩率、密度、微观结构和力学性能的影响。烧结陶瓷的收缩率、密度和抗弯强度随温度升高而增加；随着烧结温度的升高，显微硬度呈非单调变化趋势。最后，解释和讨论了烧结温度对 DLP 制造陶瓷的微观结构和机械性能的影响机制。在较高的烧结温度下，陶瓷晶粒生长并结合形成长柱状晶粒。Al的密度、显微硬度和弯曲强度在 1600 °C 下烧结的₂ O _{3陶瓷分别达到 3.51 g/cm} ³、17.71 GPa 和 175.8 MPa。