Crystallization behavior, especially spherulitic growth of a cordierite–3 mol% Y2O3–ZrO2 glass composition annealed at 950° to 1370°C was studied by optical and electron microscopy. Microstructural analysis revealed that glass‐inglass phase separation occurred prior to the crystallization of β‐quartz solid solution (ss). ZrO2 was involved in promoting the nucleation of β‐quartz ss; the crystallization evolved from a cellular to a spherulitic morphology, and β‐quartz transformed to α‐cordierite as the temperature was raised. ZrO2 was eventually expelled intergranularly and intragranularly to form slightly misoriented domains upon annealing, and the dendritic or clustered tetragonal t‐ZrO2 crystals transformed to monoclinic (m) in symmetry. A possible dragging force exerted between α‐cordierite and a glassy droplet phase is proposed to explain the corrugated cordierite/glass interface.
|Number of pages||7|
|Journal||Journal of the American Ceramic Society|
|State||Published - 1 Jan 1991|
- grain growth