Crystallization Process and Some Properties of Li(2)O-SiO(2) Glass-Ceramics Doped with Al(2)O(3) and K(2)O
authors Fernandes, HR; Tulyaganov, DU; Goel, IK; Ferreira, JMF
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords LITHIUM DISILICATE GLASS; CRYSTAL NUCLEATION; SILICATE-GLASSES; MICROSTRUCTURE; SYSTEM; STRENGTH
abstract We report on the role of Al(2)O(3) and K(2)O on crystallization in glasses featuring a SiO(2)/Li(2)O ratio (3.13 to 4.88) far beyond that of lithium disilicate (LD, Li(2)Si(2)O(5)) stoichiometry. Glasses in both bulk and frit form were produced by the conventional melt-quenching technique. Scanning electron microscopy analysis revealed surface nucleation as the dominant crystallization mechanism in glass-ceramics (GCs) derived from bulk glasses richer in Al(2)O(3) and K(2)O in the temperature range 800 degrees-900 degrees C and dendritic skeletal surface growth of lithium metasilicate crystalline phase (LS,Li(2)SiO(3)). The glasses with lower amounts of Al(2)O(3) and K(2)O showed an intermediate type of crystallization mechanism (simultaneous surface and volume nucleation) resulting in the preferential formation of Li(2)Si(2)O(5). The formation of LD GCs by sintering and the crystallization of glass-powder frits seems to occur via the precursor phase of LS, resulting in high-strength materials.
publisher WILEY-BLACKWELL PUBLISHING, INC
issn 0002-7820
year published 2008
volume 91
issue 11
beginning page 3698
ending page 3703
digital object identifier (doi) 10.1111/j.1551-2916.2008.02724.x
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000261063600035
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journal impact factor 2.956
5 year journal impact factor 2.971
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