Spherulitic Growth from a Phase‐Separated Vitreous Matrix in a Cordierite–Y‐Stabilized Zirconia Glass‐Ceramic

Yuan‐Jang ‐J Sue*, Pouyan Shen, San-Yuan Chen, Hong‐Yang ‐Y Lu

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalJournal of the American Ceramic Society
Volume74
Issue number1
DOIs
StatePublished - 1 Jan 1991

Keywords

  • cordierite
  • grain growth
  • growth
  • nucleation
  • zirconia

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