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Fabrication of Nanostructured Monoclinic Zirconia Ceramics by Colloidal Processing

Published online by Cambridge University Press:  10 February 2011

T. Uchikoshi ,
Y. Sakka ,
K. Ozawa  and
K. Hiraga
T. Uchikoshi
Affiliation:
National Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, Japan, [email protected]
Y. Sakka
Affiliation:
National Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, Japan
K. Ozawa
Affiliation:
National Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, Japan
K. Hiraga
Affiliation:
National Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, Japan
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Abstract

Fabrication of fine-grained monoclinic zirconia ceramics has been attempted from acid and neutral zirconia sols, which have been prepared by different methods. Complete re-dispersion of flocculated particles for the neutral sol is impossible even by changing its pH, while no flocculation is observed for the acid sol. Chloride ions, which are inevitably present in the acid sol, are removed effectively by using anion exchange resin. Consolidation of the sols is performed by the pressure filtration method at 10 MPa, followed by CIP treatment at 400 MPa. It is possible to densify the compacts from both sols to >98% of theoretical density by pressureless sintering in air at 1100 °C. This temperature is lower than that for the monoclinic to tetragonal transformation of pure zirconia. Fine and homogenous-grained microstructures, which have an average grain size of 92 nm, are observed for monoclinic zirconia fabricated from the acid sol. However, more coarse and heterogeneous microstructures are observed for the compact fabricated from the neutral sol.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 520: Symposium P – Nanostructured Powders & Their Industrial Application , 1998 , 103
Copyright
Copyright © Materials Research Society 1998

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References

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