Superalloy single-crystal blades are essential components of aviation engines. The increased thrust-to-weight ratio in aviation engines necessitates more stringent requirements on the complex ceramic core formation of the internal cooling channel of the hollow blade. The progress of traditional hot injection processes for ceramic cores has difficulty meeting the increasingly complex core production requirements. Vat photopolymerization 3D-printing technology for ceramic core fabrication has the advantages of not requiring mold manufacturing and flexible shaping, making it widely used in the production of complex structured ceramic cores. In addition, the industrial applicability of Al₂O₃ ceramic cores is limited by their low performance and high sintering temperature. In this work, high-performance Al₂O₃ cores with low-temperature sintering were successfully fabricated using DLP-3D-printing technology. The effects of Y₂SiO₅ addition and sintering temperature on the microstructure and properties of Al₂O₃ ceramic cores were investigated. The sintering mechanism of Al₂O₃ ceramic cores was investigated through analysis of phase composition, microstructure, and thermodynamic calculations. The results of the work show that, the flexural strength and sintering shrinkage of the Al₂O₃ ceramic cores progressively increased as the sintering temperature increased, while the open porosity rapidly dropped. The density of the Al₂O₃ ceramic cores increases significantly when the sintering temperature exceeds 1450 °C. The optimum sintering temperature for the ceramic core (15 wt% addition of Y₂SiO₅) is 1350 °C, at which point the strength is 20.282 MPa and the open porosity is 39.31%. This work provides a new process of the high-performance Al₂O₃ ceramic cores for low-temperature sintering, which reveals the mechanism of Y₂SiO₅'s effect on the densification of Al₂O₃ ceramics during sintering.

高温合金单晶叶片是航空发动机的重要组成部分。航空发动机推重比的增加对空心叶片内部冷却通道的复杂陶瓷芯结构提出了更严格的要求。传统的陶瓷磁芯热注射工艺的进步已经难以满足日益复杂的磁芯生产要求。真空光聚合3D打印陶瓷磁芯技术具有无需模具制造、成型灵活等优点，广泛应用于复杂结构陶瓷磁芯的生产。另外，Al ₂ O _{3的工业实用性}陶瓷芯因其低性能和高烧结温度而受到限制。在这项工作中，利用DLP-3D打印技术成功地制造了低温烧结的高性能Al ₂ O _3磁芯。研究了Y ₂ SiO ₅添加量和烧结温度对Al ₂ O ₃陶瓷芯材微观结构和性能的影响。通过相组成、微观结构和热力学计算分析，研究了Al ₂ O ₃陶瓷芯材的烧结机理。工作结果表明，Al ₂ O _{3的弯曲强度和烧结收缩率}随着烧结温度的升高，陶瓷芯逐渐增加，而开孔率迅速下降。当烧结温度超过1450℃时， Al ₂ O ₃陶瓷芯的密度显着增加。_{陶瓷芯材（Y 2} SiO ₅添加量为15 wt% ）的最佳烧结温度为1350 ℃，此时强度为20.282 MPa，开孔率为39.31%。该工作提供了一种低温烧结高性能Al ₂ O _{3陶瓷芯材的新工艺，揭示了Y 2} SiO _{5影响Al 2} O ₃致密化的机理。陶瓷在烧结过程中。