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Chemical Strengthening of Glass‐Ceramics in the System Li 2 O‐Al 2 O 3 ‐SiO 2
Author(s) -
KARSTETTER B. R.,
VOSS R. O.
Publication year - 1967
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.1151-2916.1967.tb15062.x
Subject(s) - spodumene , materials science , quartz , crystallization , ceramic , mineralogy , dissolution , solid solution , potassium , ion exchange , aluminium oxides , alkali metal , glass ceramic , sodium , ion , chemical engineering , composite material , metallurgy , chemistry , organic chemistry , engineering , biochemistry , catalysis
Fine‐grained glass‐ceramics containing a large proportion of β‐spodumene solid‐solution crystals were strengthened by immersion in molten sodium and potassium salt baths. An ion‐exchange reaction placed sodium or potassium ions in lithium ion sites in the β‐spodumene structure. The resultant “crowding” of the structure produced a surface compressive layer. In this system, strengths (modulus of rupture on abraded specimens) in excess of 100,000 psi were realized. In a similar manner, stuffed β‐quartz solid‐solution glass‐ceramics derived from the crystallization of Li 2 O‐Al 2 O 3 ‐SiO 2 glasses containing an appropriate amount of nucleating agent were strengthened by K + ‐for‐Li + exchange. Stable β‐quartz solid‐solution glass‐ceramics were strengthened by Na + ‐for‐Li + exchange, but no significant increase in strength was obtained in the metastable β‐quartz materials.