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transformation-toughened zirconia
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Figure 1: Resistance to cracking in transformation-toughened zirconia. In a ceramic composed of tetragonal zirconia dispersed in a zirconia matrix, the stress field advancing ahead of a propagating crack transforms the small tetragonal particles to larger monoclinic particles. The larger particles exert a crack-closing force in the process zone behind the crack tip, effectively resisting propagation of the crack.
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transformation-toughened zirconia

ceramics
Also known as: TTZ, ceramic steel

Learn about this topic in these articles:

characteristics

  • Figure 1: Resistance to cracking in transformation-toughened zirconia. In a ceramic composed of tetragonal zirconia dispersed in a zirconia matrix, the stress field advancing ahead of a propagating crack transforms the small tetragonal particles to larger monoclinic particles. The larger particles exert a crack-closing force in the process zone behind the crack tip, effectively resisting propagation of the crack.
    In advanced structural ceramics: Transformation toughening

    Ceramics such as transformation-toughened zirconia (TTZ) are often referred to as ceramic steel because the strain, or change in dimension, in response to stress behaviour resembles that of steel instead of a brittle ceramic. Also, the underlying phase transformation is called martensitic, after a similar transformation in rapidly…

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  • Outline of Coverage
    In tribological ceramics: Materials

    In transformation-toughened zirconia (TTZ), for example, surface stresses encountered during wear induce the toughening particles to transform, putting the surface into compression. This transformation not only strengthens the surface, but particles that do pull out tend to be in the submicrometre range. At such extremely small…

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