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Dissolution in Ceramic Systems: III, Boundary Layer Concentration Gradients
Author(s) -
OISHI Y.,
COOPER A. R.,
KINGERY W. D.
Publication year - 1965
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.1151-2916.1965.tb11805.x
Subject(s) - dissolution , diffusion , ternary operation , materials science , ceramic , diffusion layer , layer (electronics) , analytical chemistry (journal) , aluminium , mineralogy , chemical engineering , inorganic chemistry , chemistry , metallurgy , thermodynamics , composite material , chromatography , physics , computer science , engineering , programming language
By use of electron microbeam probe analysis on quenched samples, the concentration distribution of CaO, A1 2 O 3 , and SiO 2 was determined across the boundary layer between molten calcium aluminum silicates and dissolving or growing sapphire and fused silica. A definite shift in the concentration ratios of the solvent components was found near the interface. Analysis of diffusion flux equations for a ternary system successfully related the shift in concentration ratio to the intrinsic diffusion coefficient for each component. For alumina dissolution in a melt rich in CaO, evidence of incongruent dissolution was observed with the formation of new phases, CaO· 6Al 2 O 3 and CaO· 2A1 2 O 3 .