Abstract
Lime-stabilized zirconia of a limited composition range can be strengthened by an isothermal aging treatment in which essentially pure tetragonal zirconia is precipitated f r o m a cubic zirconia matrix. The structural changes during the aging of an 8-4mol% CaO alloy at 1300°C are described here. Nucleation and growth of the equilibrium tetragonal phase are very rapid and are completed in a short time compared with the time required to reach the highest strengths. The principal structural change during the remainder of the aging process is particle coarsening. It is found that small particles maintain their tetragonal structure on cooling to room temperature, but particles larger than ≈ 9 0 nm transform to the stable monoclinic structure. The existence of the tetragonal phase at room temperature is explained by a balance among chemical, interfacial, and strain energies.
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Hannink, R.H.J., Johnston, K.A., Pascoe, R.T., Garvie, R.C. (1990). Microstructural Changes During Isothermal Aging of a Calcia Partially Stabilized Zirconia Alloy. In: Sōmiya, S., Moriyoshi, Y. (eds) Sintering Key Papers. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0741-6_18
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DOI: https://doi.org/10.1007/978-94-009-0741-6_18
Publisher Name: Springer, Dordrecht
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