Abstract
Ceramic materials can be considerably toughened by utilizing the phase transformation of Zr02 particles. The transformation is nucleation-controlled and invariably stress-assisted. Three main toughening mechanisms are operative: stress-induced transformation, microcracking and crack deflection. Some toughened ceramics with low critical transformational stress “exhibit transformation plasticity and memory effects analogous to martensitic metal alloys. Micro- structural features of the three Zr02 toughened ceramic (ZTC) groups are presented: Partially — stabilized Zr02 (PSZ), tetragonal Zr02 polycrystals (TZP) and dispersion -toughened ceramics, e.g. ZT-AI2O3, ZT-mullite, etc. The mechanical properties of some ZTC are compared with predicted values. Since ZTC generally exhibit a disappointing high-temperature behavior, some strategies are outlined to overcome the characteristic deficiencies.
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© 1987 ECSC, EEC, EAEC, Brussels and Luxembourg
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Claussen, N. (1987). Transformation Toughening of Ceramics. In: Herrmann, K.P., Larsson, L.H. (eds) Fracture of Non-Metallic Materials. Ispra Courses. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4784-9_8
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DOI: https://doi.org/10.1007/978-94-009-4784-9_8
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