Effect of calcination on the sintering of gel-derived zirconia-toughened alumina

Peter den Exter, Louis Winnubst, Theo H.P. Leuwerink, Anthonie J. Burggraaf

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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.
Original languageEnglish
Pages (from-to)2376-1280
Number of pages5
JournalJournal of the American Ceramic Society
Issue number9
Publication statusPublished - 1994


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