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

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Abstract:

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.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

77-80

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.77

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Online since:

August 2006

Authors:

M.J. Cho, Sang Heum Youn, Jae Jun Kim, Kyu Hong Hwang, Jong Kook Lee, Mikio Iwasa

Keywords:

Al2O3 Matrix, Coprecipitation, Partial Chemical Dispersion Processes, Polymeric Precursor Process, ZrO2 Dispersion

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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