Properties of alumina-zirconia powder prepared from aluminium chelate compound and zirconium alkoxide

摘要

Alumina-zirconia powder (AZ) was prepared bythermal decomposition of organic precursors synthesized fromethyl acetoacetate aluminium dusopropoxide and zirconium tetra-n-butoxide. The specific surface area of AZ was higher than that ofalumina-zirconia powder (ALK) prepared from aluminium tri-sec-butoxide and zirconium tetra-n-butoxide in the range of 0-40molpercent ZrO_2. The pore radius for AZ containing 0-40molpercent ZrO_2 distributed from 1 to 3 nm. The true density ofAZ was lower than that of ALK in the range of 0-40 molpercentZrO_2. Four- and 6-coordinated Al atoms existed in ZrO_2-freeAZ, while 5-coordinated Al atoms in addition to 4- and 6-coordinated Al atoms existed in AZ containing 20-80 molpercentZrO_2. These results indicate that alumina component andzirconia component in AZ were mixed homogeneously at the atomic level.