fig2

Figure 2. SEM images of fractured surfaces of Al₂O₃-A ceramics sintered at (A) 1,000 °C, (B) 1,200 °C, (C) 1,400 °C, (D) 1,450 °C, (E) 1,500 °C, (F) 1,550 °C, (G) 1,600 °C, and (H) 1,650 °C.