The precision casting method based on alumina-based ceramic cores is one of the main techniques used to manufacture hollow turbine blades. Additive manufacturing (AM) technology provides an alternate solution to fabricating ceramic cores quickly and precisely. As the complexity of the structure increases and the strength of the material improves, the leaching process of the cores becomes more complicated. This study proposes a compound pore-forming method to increase the porosity of ceramic cores by adding a preformed-pore agent and materials that convert to easy-to-corrode phases. The preformed-pore agents (e.g., carbon fibers) can be burned off during sintering to form pores before the leaching, and the easy-to-corrode phases (e.g., CaCO₃, SiO₂, β-Al₂O₃) can be leached firstly to form pores during the leaching process. The pores formed in the aforementioned two stages increase the contact area of the cores and leaching solution, thus improving the leaching rate. In the current study, the additive amount of the preformed-pore agent was optimized, and the effect of the easy-to-corrode phases on the comprehensive properties of the cores was then compared. Based on this, the corresponding model was established.

中文翻译：

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基于增材制造的空心涡轮叶片陶瓷芯浸出改进

基于氧化铝基陶瓷芯的精密铸造方法是用于制造中空涡轮叶片的主要技术之一。增材制造（AM）技术为快速，精确地制造陶瓷芯提供了另一种解决方案。随着结构的复杂性增加和材料的强度提高，芯的浸出过程变得更加复杂。这项研究提出了一种复合孔形成方法，通过添加预成型的孔剂和可转变为易腐蚀相的材料来增加陶瓷芯的孔隙率。预孔剂（例如碳纤维）可以在烧结过程中被烧掉，在浸出之前形成孔，而易腐蚀相（例如CaCO ₃，SiO ₂，β- Al₂ O ₃）可在浸出过程中首先浸出形成孔。在上述两个阶段中形成的孔增加了芯和浸出溶液的接触面积，从而提高了浸出率。在当前的研究中，优化了预制孔剂的添加量，然后比较了易腐蚀相对型芯综合性能的影响。在此基础上，建立了相应的模型。