PREPARATION OF ZRO2-AL2O3 POWDER BY THERMAL DECOMPOSITION OF GELS PRODUCED FROM AN ALUMINIUM CHELATE COMPOUND AND ZIRCONIUM BUTOXIDE

摘要

Organic precursors containing Al and Zr atoms were synthesized from an aluminium chelate compound and zirconium n-butoxide. A ZrO2-Al2O3 composite powder was prepared by the thermal decomposition of these precursors. An amorphous phase exists to higher temperatures for this ZrO2-Al2O3 powder than for a comparable powder prepared from aluminium sec-butoxide and zirconium n-butoxide. In addition the tetragonal ZrO2 phase was stabler in this ZrO2-Al2O3 powder than in a comparison powder. The ZrO2 grains were 50-500 nm in diameter and were homogeneously dispersed in the Al2O3 matrix after heating at 1400 degrees C. [References: 12]