Effect of Calcination on the Sintering of Gel-Derived, Zirconia-Toughened Alumina

Exter den, Peter and Winnubst, Louis and Leuwerink, Theo H.P. and Burggraaf, Anthonie J. (1994) Effect of Calcination on the Sintering of Gel-Derived, Zirconia-Toughened Alumina. Journal of the American Ceramic Society, 77 (9). pp. 2376-2380. ISSN 0002-7820

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Abstract:	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.
Item Type:	Article
Copyright:	© 1994 Wiley InterScience
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Membranes (IM)
Link to this item:	http://purl.utwente.nl/publications/71068
Official URL:	http://dx.doi.org/10.1111/j.1151-2916.1994.tb04608.x
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