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Secondary Grain Growth of Li 2 O‐A1 2 O 3 ‐SiO 2 ‐TiO 2 Glass‐Ceramics
Author(s) -
CHYUNG C. K.
Publication year - 1969
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.1151-2916.1969.tb09175.x
Subject(s) - materials science , grain growth , grain boundary , grain boundary diffusion coefficient , activation energy , mineralogy , diffusion , ceramic , grain size , thermal stability , abnormal grain growth , rutile , phase (matter) , analytical chemistry (journal) , metallurgy , chemical engineering , microstructure , thermodynamics , chemistry , physics , organic chemistry , chromatography , engineering
The kinetics of secondary grain growth in a Ti0 2 ‐nucleated β‐spodumene solid‐solution glass‐ceramic was studied. The thermal stability of the grains was excellent. Grain growth followed the cube‐root‐of‐time law. The activation energy of the grain boundary migration was 55 ± 10 kcal/mol. Grain growth inhibition due to Ti0 2 precipitates and the residual glassy phase was closely examined. The excellent thermal stability of the grains is due to grain growth inhibition by the residual glassy phase, not by rutile precipitates. It is suggested that the diffusion of A 2+ , and probably the simultaneous diffusion of Li + , through the residual glass is the rate‐limiting process for the grain boundary migration.