Abstract
The effect of calcination on the characteristics and sintering behaviour of zirconia-toughened alumina (ZTA) composite powders has been investigated. TiO2 was selected as an additive to promote the sinterability of ZTA powders. The starting materials were Al2O3 powder, Zr(OC3H7)4 and Ti(OC3H7)4, and homogeneous ZTA powder containing Zr-O-Ti bonding was prepared. Calcination affected the tetragonal→monoclinic phase transformation temperature of ZrO2 crystallizing from the gels. Calcination improved the densification rate of ZTA powder compact during sintering, which was attributed to the optimal ZrO2 particle size and distribution on the surface of alumina. A ZTA specimen with high bulk density and high tetragonal ZrO2 content was obtained under the conditions of 850°C/1 h calcination and 1500°C/1 h sintering.
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Hwang, CS., Tsaur, SC. Effect of calcination on characteristics and sintering behaviour of Al2O3-ZrO2 composite powders. J Mater Sci 27, 6791–6796 (1992). https://doi.org/10.1007/BF01165970
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DOI: https://doi.org/10.1007/BF01165970