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Strength Improvement in Transformation Toughened Ceramics using Compressive Residual Surface Stresses

Published online by Cambridge University Press:  25 February 2011

R. A. Cutler ,
J. J. Hansen ,
A. V. Virkar ,
D. K. Shetty  and
R. C. Winterton
R. A. Cutler
Affiliation:
Ceramatec, Inc., 2455 S. 900 W., Salt Lake City, UT 84119
J. J. Hansen
Affiliation:
Ceramatec, Inc., 2455 S. 900 W., Salt Lake City, UT 84119
A. V. Virkar
Affiliation:
Department of Materials Science and Engineering. University of utah, Salt Lake City, UT 84112
D. K. Shetty
Affiliation:
Department of Materials Science and Engineering. University of utah, Salt Lake City, UT 84112
R. C. Winterton
Affiliation:
The Dow Chemical Company, Central Research Inorganic Materials and Catalysis Laboratory, Midland, MI 48674
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Abstract

A1 2 03–15 vol. % ZrO2 bar shaped composite specimens were fabricated by pressing three layers. The two outer layers consisted of Al2O3 and unstabilized ZrO2 (primarily in the monoclinic polymorph), and the inner layer consisted of Al2O3 and partially stabilized zirconia in the tetragonal polymorph. The transformation of ZrO2 from tetragonal to monoclinic, upon cooling from sintering temperature, led to the establishment of residual compressive stresses in the outer layers. Flexural tests at room temperature showed that residual stresses contributed to strength increasing from 450 to 825 MPa. The existence of these stresses was verified by measuring apparent fracture toughness, as well as using strain gages. Strength and toughness data were obtained at 500, 750, and 1000°C. X-ray diffraction was used to explain the elevated temperature data by monitoring the monoclinic to tetragonal transformation upon heating to 1000°C.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 78: Symposium E – Advances in Structural Ceramics , 1986 , 155
Copyright
Copyright © Materials Research Society 1987

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References

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