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Characterization of Intergranular Phases in Tetragonal and Cubic Yttria-Stabilized Zirconia

Published online by Cambridge University Press:  02 July 2020

N.D. Evans ,
P.H. Imamura ,
J. Bentley  and
M.L. Mecartney
N.D. Evans
Affiliation:
Oak Ridge Institute for Science and Education, P.O. Box 117, Oak Ridge, TN, 37831 Metals & Ceramics Div., Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831-6376
P.H. Imamura
Affiliation:
Dept. of Biochemical Engineering and Materials Science, University of California, Irvine, CA, 92697
J. Bentley
Affiliation:
Metals & Ceramics Div., Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831-6376
M.L. Mecartney
Affiliation:
Dept. of Biochemical Engineering and Materials Science, University of California, Irvine, CA, 92697
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Extract

Achieving superplasticity in fine-grained ceramics is a potential method to lower energy costs associated with ceramic manufacturing via net shape forming. Superplasticity is intrinsic in 3-mol%- yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP), and can be enhanced by addition of glass to form intergranular phases which are thought to both limit grain growth and promote grain boundary sliding during processing (sintering and hot isostatic pressing). This permits processing at lower temperatures. However, superplasticity has not been observed in 8-mol%-yttria-stabilized cubic zirconia (8Y-CSZ), ostensibly due to its larger grain size and high grain growth rates.3,4 As part of a larger study, high-spatial-resolution energy-dispersive X-ray spectrometry (EDS) has been performed on 3Y-TZP and 8Y-CSZ specimens doped with various glassy phases to characterize intergranular compositions.

Zirconia powders were mixed with glass to produce specimens having either 1 wt % lithiumaluminum- silicate, 1 wt % barium-silicate, or 1 wt % borosilicate. Some specimens were prepared without added glass.

Type
Microscopy of Ceramics and Minerals
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 584 - 585
Copyright
Copyright © Microscopy Society of America

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References

1. Gust, M. et al., 7. Amer. Ceram. Soc. 76(7) (1993) 1681.CrossRefGoogle Scholar

2. Wakai, F. et al., Materials Science Forum 243–245 (1997) 337.Google Scholar

3. Nieh, T.G. and Wadsworth, J., J. Am. Ceram. Soc. 72(8) (1989) 1469.CrossRefGoogle Scholar

4. Sharif, A. A. et al., Acta Materialia (1998) in press.Google Scholar

5. Research at the SHaRE User Facility sponsored by the Division of Materials Sciences, U.S. Department of Energy, under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp., and through the SHaRE Program under contract DE-AC05-76OR00033 with Oak Ridge Associated Universities.Google Scholar