The compressive creep of 18 mol% CaO‐stabilized ZrO 2 was studied at 1200° to 1400°C and 500 to 4000 psi. The specimens were polycrystalline with grain diameters from 7 to 29 μm. The activation energy for creep is 94 kcal/mol, and the creep rates are linearly proportional to the stress and to the inverse of the grain size. These results lead to the conclusion that creep in 18 mol% CaO‐stabilized ZrO 2 may be controlled by cation diffusion associated with grain‐boundary sliding.
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St-Jacques et al. (1972) studied this question.
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