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Spherulitic Growth from a Phase‐Separated Vitreous Matrix in a Cordierite–Y‐Stabilized Zirconia Glass‐Ceramic
Author(s) -
Sue YuanJang,
Shen Pouyan,
Chen SanYuan,
Lu HongYang
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb07301.x
Subject(s) - cordierite , crystallization , nucleation , materials science , quartz , tetragonal crystal system , annealing (glass) , cubic zirconia , phase (matter) , mineralogy , chemical engineering , composite material , ceramic , crystallography , crystal structure , geology , chemistry , organic chemistry , engineering
Crystallization behavior, especially spherulitic growth of a cordierite–3 mol% Y 2 O 3 –ZrO 2 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 ). ZrO 2 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. ZrO 2 was eventually expelled intergranularly and intragranularly to form slightly misoriented domains upon annealing, and the dendritic or clustered tetragonal t ‐ZrO 2 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.