An analytical approach for fraction calculation of monoclinic phase on zirconia surface under aging conditions was developed. The approach is based on a model of nucleation and growth of areas which underwent tetragonal to monoclinic transformation. Nucleation in this model takes place only at the material surface with nucleation rate proportional to the area of non-transformed zone. The nuclei are conical in shape; their initial dimensions and growth rate are constant. The resulting equations describe factual and observed monoclinic phase content on the surface of zirconia ceramics. The equations correlate well with experi- mental data on tetragonal zirconia ceramics aging kinetics. . . . Keywords Zirconia TZP Aging Modeling Introduction of tetragonal to monoclinic (t-m) transformation with increase in temperature is observed [8, 9]. On the other hand, uncon- Zirconia ceramics are structural materials renowned for their trolled t-m transformation in humid environment, especially in outstanding combination of hardness, fracture toughness, flex- the temperature range 100–400 °C, takes place—phenomenon ural strength, and corrosion resistance [1, 2]. Fracture tough- known as LTD (low-temperature degradation). LTD is partic- ness and bending strength associated with zirconia ceramics ularly important for zirconia ceramics used in dental restor- resistance to crack propagation can indeed
Journal of the Australian Ceramic Society – Springer Journals
Published: Jun 6, 2018
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