Abstract：SiO2-ZrO2 based ceramic core plates with calcium stabled zirconia were fabricated by ceramic injection moulding. The hollow interfacial reaction plates of DZ125,DD5 and DD6 superalloys were fabricated by directional solidification at 1510℃and 1530℃ using SiO2-ZrO2 based ceramic cores, and the interfacial samples were obtained by horizontally cutting these hollow plates. The microstructure analysis of the interfacial samples shows that the high temperature chemical stability of SiO2-ZrO2 based ceramic core above 1500℃ is poor, due to different chemical reactions with DZ125, DD5 and DD6, and the reaction products are closely related to the compositions of superalloys. For DZ125 superalloy with higher Hf content,the reaction product is HfO2,which is rich on the interface and protects Al in DZ125 superalloy from oxidation. For DD5 and DD6 superalloys with lower Hf,Al2O3 is the reaction product between superalloys and ceramic cores and comes from the reaction between Al in superalloys and SiO2 in ceramic cores,which is accelerated by calcium stabled zirconia.
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