The densification behavior of ZrO2 (+ 3 mol% Y2O3)/85 wt% Al2O3 powder compacts, prepared by the hydrolysis of metal chlorides, can be characterized by a transition- and an α-alumina densification stage. The sintering behavior is strongly determined by the densification of the transition alumina aggregates. Intra-aggregate porosity, resulting from calcination at 800°C, partly persists during sintering and alumina phase transformation and negatively influences further macroscopic densification. Calcination at 1200°C, however, densifies the transition alumina aggregates prior to sintering and enables densification to almost full density (96%) within 2 h at 1450°C, thus obtaining a microstructure with an alumina and a zirconia grain size of 1 μm and 0.3–0.4 μm, respectively.
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1994|
den Exter, P., Winnubst, L., Leuwerink, F. T. H., & Burggraaf, A. J. (1994). Effect of calcination on the sintering of gel-derived zirconia-toughened alumina. Journal of the American Ceramic Society, 77(9), 2376-1280. https://doi.org/10.1111/j.1151-2916.1994.tb04608.x