Abstract
The reaction mechanism at the interface between CaO-Y2O3 composite oxide refractories and superalloy melt during vacuum induction melting of Ni-based superalloys was investigated. Once the reaction occurred, the interfacial layer consisted of exterior CaS layer and interior CaYAlO4 layer. CaS was formed by the desulfurization reaction of CaO and S from alloy melt. While the CaYAlO4 was formed by the reaction of 12CaO·7Al2O3 or Al2O3 (CaO and Y2O3 were replaced by Al), CaO and Y2O3. The whole interfacial reaction was: CaO(s)+[S]Ni(l)+[Al]Ni(l)+Y2O3(s)=CaYAlO4(s)+ CaS(s)+[Y]Ni(l).
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