Phase‐transformation‐induced compressive surface stresses were introduced into ceria‐doped tetragonal zirconia polycrystals by reduction of CeO 2 . Four‐point‐bending strength of sintered ZrO 2 containing 12 mol% CeO 2 increased from 240 to 545 MPa after it was annealed at 1400°C for 2 h in nitrogen. The strength of the same material hot isostatically pressed in oxygen increased after it was annealed in nitrogen for 2 h at 1500°C from 430 to 595 MPa.
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Heussner et al. (1989) studied this question.
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