Effect of nanometer Al2O3 powder on microstructure and properties of alumina ceramics by microwave sintering

Abstract The effect of nanometer Al 2 O 3 powder on microstructure and properties of alumina ceramics by microwave sintering was investigated. The maximum bending strength and fracture toughness of alumina ceramics reach up to 294.41 Mpa and 4.14 Mpa m 1/2 , as the alumina ceramics with 20 wt% nanometer A1 2 O 3 powder was microwave sintered at 1500 °C for 30 min. It may be attributed to the addition of nanometer A1 2 O 3 powder and microwave-sintering process resulting in a synergistic effect on improvement of microstructure and mechanical properties.