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Creep characteristics of alumina, nickel aluminate spinel, zirconia composites

Published online by Cambridge University Press:  31 January 2011

R. Peter Dillon ,
Dong-Kyu Kim ,
Joy E. Trujillo ,
Waltraud M. Kriven  and
Martha L. Mecartney
R. Peter Dillon
Affiliation:
University of California, Irvine, Department of Chemical Engineering and Materials Science, Irvine, California 92697-2575
Dong-Kyu Kim
Affiliation:
University of Illinois at Urbana–Champaign, Department of Materials Science and Engineering, Urbana, Illinois 61801
Joy E. Trujillo
Affiliation:
University of California, Irvine, Department of Chemical Engineering and Materials Science, Irvine, California 92697-2575
Waltraud M. Kriven
Affiliation:
University of Illinois at Urbana–Champaign, Department of Materials Science and Engineering, Urbana, Illinois 61801
Martha L. Mecartney*
Affiliation:
University of California, Irvine, Department of Chemical Engineering and Materials Science, Irvine, California 92697-2575
*
a) Address all correspondence to this author. e-mail: martham@uci.edu
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Abstract

Fine grained, three-phase ceramic composites that exhibit favorable toughness, hardness, and high room-temperature strength were evaluated for high-temperature mechanical stability. A 50vol%Al2O3–25vol%NiAl2O4–25vol%3 mol%yttria-stabilized tetragonal zirconia polycrystal (3Y–TZP) and a 33vol%Al2O3–33vol%NiAl2O4–33vol%3Y-TZP composite were compression creep tested at temperatures between 1350 and 1450 °C under constant stresses of 20–45 MPa. The three-phase microstructure effectively limited grain growth (average d0 = 1.3 μm, average df = 1.6 μm after 65% true strain). True strain rates were 10−4 to 10−6 s−1 with stress exponents n = 1.7 to 1.8 and a grain-size exponent p = 1.3. A method for compensating for grain growth is presented using stress jump tests. The apparent activation energy for high-temperature deformation for 50vol%Al2O3–25vol%NiAl2O4–25vol%3Y–TZP was found to be 373 kJ/mol-K.

Keywords

CeramicCompositeSuperplasticity
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 556 - 564
Copyright
Copyright © Materials Research Society 2007

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References

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