Abstract
The behavior of grain growth and phase separation of sintered ZrO 2–2–8 mol.% Y 2O 3 ceramics annealed at high temperatures were investigated by means of SEM, EPMA, XRD and quantitative metallography. The results show that the grain size increases with increasing Y 2O 3 content and annealing time. The grain growth is very slow in the single tetragonal phase region and very fast in the single cubic phase region. However, in the c+t two-phase region, the cubic graibs grow more slowly, but tetragonal grains more quickly than in the single cubic or tetragonal phase regions. With the increase of annealing time in the c+t two-phase region, the Y 2O 3 content in the tetragonal phase decreases, but remains almost unchanged in cubic phase.
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