Conclusions
An all-round investigation was made of the behavior of heterogeneous ceramic materials (GKM) based on alumina, yttria, and zirconia, during thermal and mechanical loading; this demonstrated that the thermal-shock resistance is due to the combined effects of deformation features and the structure's resistance to breakdown.
It is noted that the important factors in evaluating the thermal-shock resistance of inelastic GKM, characterized by a measure of brittleness of less than unity, are the inherent R-curve effects, the excess of the value ofγ wof over the valueγ abt, the equality of the KIc determined on specimens with a notch and on those with a sharp crack, and the high sensitivity to the rate of thermal and mechanical loading.
Using, as an example, alumina containing zirconia additive, we show that with increase in the stresses in the inelastic heterogeneous material, there is an increase in the length and number of microcracks controlling the features of its mechanical behavior.
Using, as an example, zirconia ceramic stabilized with magnesia, we show that there may be a relationship between the thermal-shock resistance of inelastic heterogeneous materials and the temperature changes of their mechanical characteristics.
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Translated from Ogneupory, No. 11, pp. 2–8, November, 1993.
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Gogotsi, G.A. Thermal-shock resistance of heterogeneous ceramics and refractories. Refractories 34, 539–547 (1993). https://doi.org/10.1007/BF01292734
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DOI: https://doi.org/10.1007/BF01292734