Research progress in defect analysis and regulation mechanism of ceramic cores in stereolithographic additive manufacturing

Superalloy hollow turbine blades are key components of aero engines， and the ceramic core used for forming the complex cooling channel structure inside the blade is a key transitional component in the blade preparation. The stereolithographic additive manufacturing process for ceramic cores has the advantages of no need for molds， high precision， and short process cycle， providing a reliable new process for the high-precision preparation of complex-structured ceramic cores. Among them， defect control in the additive manufacturing process of cores has become the key to the preparation of high-precision ceramic cores. This work summarizes the current research status of printing， degreasing and sintering defect control at home and abroad. The defect regulation mechanism is summarized， and the research status of defect regulation is reviewed from aspects such as slurry preparation， printing and degreasing-sintering process optimization， and the addition of mineralizers. On this basis， it is proposed that curing behavior， pore distribution law and deep learning are important development directions for future research on ceramic cores.