Homogeneous ZrO ₂ –Al ₂ O ₃ Composite Prepared by Nano‐ZrO ₂ Particle Multilayer‐Coated Al ₂ O ₃ Particles

Abstract

ZrO 2 –Al 2 O 3 nanocomposite particles were synthesized by coating nano‐ZrO 2 particles on the surface of Al 2 O 3 particles via the layer‐by‐layer (LBL) method. Polyacrylic acid (PAA) adsorption successfully modified the Al 2 O 3 surface charge. Multilayer coating was successfully implemented, which was characterized by ξ potential, particle size. X‐ray diffraction patterns showed that the content of ZrO 2 in the final powders could be well controlled by the LBL method. The powders coated with three layers of nano‐ZrO 2 particles, which contained about 12 wt% ZrO 2 , were compacted by dry press and cold isostatically pressed methods. After sintering the compact at 1450°C for 2 h under atmosphere, a sintered body with a low pore microstructure was obtained. Scanning electron microscopy micrographs of the sintered body indicated that ZrO 2 was well dispersed in the Al 2 O 3 matrix.