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Title:: Research Status on Removal Technology of Ceramic Core for Hollow Blades

Author(s):: WANG Fei1; LI Fei1; YU Jianbo2; SUN Baode1; 3; (1. Shanghai Key Laboratory of Advanced Hightemperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China)(2. Shanghai Key Laboratory of Modem Metallurgy and Materials Processing School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)(3. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)

Keywords:: ceramic core; leach technology; hollow blade; physicalchemical removal technology; investment casting

Abstract:: With the improvement of the demand for the thermal efficiency of the gas turbine, hightemperature tolerance of turbine blade becomes more important. It has been one of the key techniques to use the ceramic core to form complex air cooling channels to improve cooling efficiency in the manufacturing of turbine blade. The cooling structure of the turbine blade evolves from traditional ways to efficient divergent cooling and lamellar tablet cooling. The structure of the ceramic core gets increasingly complex. The research status and significance of removal technologies of ceramic core were summarized. The progress in the investigation on chemical and physicalchemical removal technology of ceramic core, including chemical intermediate and technology parameters during the removal process of the core was systematically reviewed in this paper. The paper focused on the effect of outer physical fields such as mechanical stirring, gas stirring, ultrasound stirring, liquid spraying and liquidelectric effect on continuity and rata of removal reaction. The challenges of manufacturing and maintenance of removal equipment were finally discussed.