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Preparation and Sintering of Silica-Doped Zirconia 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, 1–2–1, Sengen, Tsukuba, Ibaraki 305, Japan
Y. Sakka
Affiliation:
National Research Institute for Metals, 1–2–1, Sengen, Tsukuba, Ibaraki 305, Japan
K. Ozawa
Affiliation:
National Research Institute for Metals, 1–2–1, Sengen, Tsukuba, Ibaraki 305, Japan
K. Hiraga
Affiliation:
National Research Institute for Metals, 1–2–1, Sengen, Tsukuba, Ibaraki 305, Japan
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Abstract

Silica-doped (SiO2= 0–1.0 mass%) zirconia (3 mol% Y2O3-doped tetragonal ZrO2) compacts are prepared from hetero-coagulated and well-dispersed suspensions by colloidal processing. The suspensions are consolidated by a pressure filtration technique. The green density of the compacts consolidated from the well-dispersed suspensions is higher than that from the hetero-coagulated suspensions. The lower density of the latter compacts is improved by a subsequent cold isostatic pressing (CIP) at 400 MPa. The sinterability of the compacts at 1200 °C is greatly affected by the amount of doped silica. The densification and grain growth are hindered by silica doping above 0.3 wt% at 1200 °C. All the compacts are densificated to a relative density of above 99% by sintering at 1300 °C for 2 h.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 33
Copyright
Copyright © Materials Research Society 1997

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References

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