Abstract
This paper discusses the effect of unstabilized zirconia dispersions on the thermal shock resistance of brittle structural ceramics.
A general discussion is given of the preferred direction of modification of the pertinent material properties which affect thermal shock resistance. The nature of the crystallographic phase transformation in the zirconia and its effect on these properties is presented. The zirconia dispersed phase can lead to significant improvements in fracture toughness by transformation - or microcrack toughening. The volume change during the zirconia phase transformation also lowers the effective coefficient of thermal expansion. Surface compressive stresses which result from the phase transformation during surface grinding also are beneficial in improving thermal shock resistance. The zirconia phase also can change the unstable (cȧtastrophic) mode of failure to the more preferred stable one with decrease in fracture stress. These effects are illustrated by experimental data for composites, consisting of zirconia dispersions in aluminum oxide, silicon nitride and zircon matrices.
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© 1980 Plenum Press, New York
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Claussen, N., Hasselman, D.P.H. (1980). Improvement of Thermal Shock Resistance of Brittle Structural Ceramics by a Dispersed Phase of Zirconia. In: Hasselman, D.P.H., Heller, R.A. (eds) Thermal Stresses in Severe Environments. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3156-8_25
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DOI: https://doi.org/10.1007/978-1-4613-3156-8_25
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