Abstract
The interfacial behavior between CaAl12O19-MgAl2O4 spinel (CA6-MA) crucible and molten wrought Ni-based superalloys during the vacuum induction melting process have been comprehensively investigated, with Al2O3 crucible included for comparison. Experimental and theoretical results suggest that CA6-MA crucible exhibits higher thermodynamic stability and poor wettability to the superalloy melt. Benefited from these merits, the superalloy ingot with cleaner surfaces and more metallic luster is obtained in the CA6-MA crucible. Furthermore, the total oxygen content in the superalloy ingots obtained from CA6-MA crucible is 17.9 ppm, which is considerably lower than that from Al2O3 crucible (29.7 ppm). These results indicate that CA6-MA crucible can be a promising candidate for melting wrought Ni-based superalloys.
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