Effect of trace impurity elements on the wettability and interfacial reaction between DZ125 alloy and ceramic shell

The effects of impurity elements on the wettability and interfacial reaction between superalloy and ceramic shell were investigated by the sessile-drop method. The wetting angle decreases with the increase of impurity content and the decrease of holding temperature. In addition, the thickness of the interfacial reaction layer increases with the increase of impurity content and the decrease of holding temperature. The adsorption of interfacial active atoms such as O, N and S is the main driving force of the wettability diffusion, which can reduce the surface tension of the alloy melt and enhance the wettability of the solid-liquid interface.