Interface reactions between Al₂O₃ mold and directionally solidified alloy IC10

The interface reaction between directionally solidified alloy IC10 and Al2O3 ceramic mold was investigated by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results show that the interface reaction between Al2O3 ceramic mold and alloy IC10 occurs, and severe sand-burning of the alloy surface is observed. Due to the high content of 1.5% (mass fraction) Hf, the activity of alloy IC10 obviously increases. The reaction zone with thickness about 5-8 μm can be divided into inner layer and outer layer. The outer layer is mainly HfO2, and the inner layer is rich in (Al,Ta,Nb) oxides, Al content is 80%. Hf and Al are the main elements induced the reactions