Electronic Binding Energy Changes of Elements in Al2O3-MgAlON Composite during the Crack Healing Process

Using Al, MgO and Al₂O₃ as raw materials, Al₂O₃-MgAlON composite was synthesized in N₂ atmosphere by hot-press sintering at 900ºC. Cracks prepared on the sample surface were healed at 1200ºC×6hrs. Phase composition and element chemical state of sample were studied before and after healing. The results showed that: after healing process Al and MgO phase disappeare, and AlN and MgAlON phase appear, all kinds of elements in Al₂O₃-MgAlON material change their chemical state after the healing treatment, the changed electronic binding energy is Al 0.05ev, Mg 0.08ev, O 2.58ev or N 1.02ev respectively, and the chemical composition and crystal structure of MgAlON phase also change, all these change are helpful for crack healing process of Al₂O₃-MgAlON material.