Effect of Ru and Y on the Interface Reaction Between Cast Superalloy and Ceramic Materials
The four kinds of single crystal superalloy blades with different Ru and Y content were cast in a directionally solidified furnace using the same silica-based ceramic core,Al2O3 mold shell,melting process and directional solidification process.Effect of enhancing microstructure stability element Ru and improving the oxidation resistance element Y on the interface reaction between cast superalloy and ceramic materials was studied.The results show that the alloy the interfacial reaction of the alloy and mold shell mainly is physical burning-on action and no obvious chemical reaction between alloying elements and mold shell when the alloy contains no Ru and Y element.A slight interfacial reaction occurred between the same alloy and the ceramic core.In addition to the physical interaction,the chemical reaction between Al and SiO2 also occurred.Adding Ru in the alloy has no effect on the interfacial reaction between the alloy and the mold shell or ceramic core.When 0.01％Y is added to the alloy,the interfacial reaction between the alloy and the mold shell or ceramic core is slightly increased,but the effect is small because the small amount of Y added.
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