Dispersion of ZrO2 Particles in the Al2O3/ZrO2 Ceramics by the Partial Chemical Dispersion Processes


Article Preview

To improve the mechanical properties of Al2O3/ZrO2 composites, the homogeneous dispersion of ultra low size ZrO2 particles in Al2O3 ceramics have been controlled by partial dispersion of ZrO2 by chemical processes such as coprecipitation or polymeric precursor method(Pechini process). So nanosized Zr/Y hydroxide were coprecipitated or polymerized directly to the surfaces of commercial sub-micron size α-alumina powder(Sumitomo: AES-11(0.4 μm)) using ZrOCl2 /Y(NO3)3 solution. By the partial coprecipitation method, dispersion of relatively small sized ZrO2 in Al2O3/ZrO2 composites could be achieved at 1500~1600° C of sintering temperature. In case of the polyesterization of Zr/Y(NO3)3-citric acid solution in ethylene glycol directly to the commercial sub-micron size α-alumina powder, more homogeneous dispersion of relatively low sized ZrO2 in Al2O3/ZrO2 composites could be obtained at 1450~1600°C of sintering temperature range and their mechanical strength was more enhanced.



Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara




M.J. Cho et al., "Dispersion of ZrO2 Particles in the Al2O3/ZrO2 Ceramics by the Partial Chemical Dispersion Processes", Key Engineering Materials, Vols. 317-318, pp. 77-80, 2006

Online since:

August 2006




[1] A.H. Heuer, Alloy Design in Partially Stabilized Zirconia, in Advances in Ceramics, Vol. 3, Science and Technology of Zirconia I, pp.98-115, Edited by A.H. Heuer, et al., The American Ceramic Society, Inc. (1981).

[2] S.J. Bennison and B.R. Lawn, Flaw Tolerance in Ceramics with Rising Crack-Resistance Characteristics, J. Mater. Sci., 24, 3169 (1989).

DOI: https://doi.org/10.1007/bf01139037

[3] K. Niihara, New Design Concept of Structural Ceramics - Ceramic Nanocomposites, J. Ceram. Soc. Jpn., 99, 10 (1991).

[4] H. Kimura, A Breakthrough via Nanocrystalline Synthesis in Structural Ceramics, J. of Metastable and Nanocrystalline Mat., 15-16, 591-598 (2003).

DOI: https://doi.org/10.4028/www.scientific.net/jmnm.15-16.591

[5] Tai, L. and Lessing, P. A., Modified Resin-Intermediate Processing of Perovskite Powder: Part 1: Optimization of Polymeric Precursors, J. Mat. Res., 7, 502 (1992).

DOI: https://doi.org/10.1557/jmr.1992.0502

[6] M.J. Cho, K.H. Hwang, and J.K. Lee, Fabrication of Al2O3/ZrO2 Ceramics by the Polymerization Dispersion Process, J. of the Kor. Cer. Soc., 41.

[4] 284-288 (2004).