Ordering nanostructure and properties of Al_2O_3/ZrO_2 eutectic ceramic composites prepared by combustion synthesis under low pressure

摘要

Al_2O_3/ZrO_2 eutectic ceramics were prepared by combustion synthesis using Al and Zr(NO_3)_4 as raw materials. Al_2O_3/ZrO_2 eutectic structure showed that randomly-oriented rod-like ZrO_2 phases were embedded in Al_2O_3 matrix with a spacing of about 280 nm. The bending strength and fracture toughness of the product reached 1060MPa and 11.2MPa·m~(1/2), respectively, which were attributed to nanostructure eutectic, bridge and pull-out effects of the rod-like ZrO_2.