Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1968-12-18
1978-02-21
Fisher, Richard V.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 33, 106 397, C03C 322, C03C 2100
Patent
active
040749924
ABSTRACT:
This invention relates to the strengthening of glass-ceramic articles wherein the crystal content thereof comprises the predominant portion and containing beta-spodumene solid solution as the principal crystal phase. The strengthening is effected by means of an ion exchange process taking place within the crystals in a surface layer of the article such that sodium ions from an external source are exchanged for lithium ions in the crystal phase thereby causing compressive stresses to be set up in the surface layer.
REFERENCES:
patent: 3157522 (1964-11-01), Stookey
patent: 3218220 (1965-11-01), Weber
patent: 3428513 (1969-02-01), Denman
patent: 3647489 (1972-03-01), McMillan et al.
G. B. Carrier; "Electrol Microscopic Technique for Determining the Percent Crystallinity of Glass-Ceramic Materials;" Journal of the American Ceramic Society, vol. 47, No. 8, Aug. 1964.
Ohlberg et al., "Crystal Nucleation by Glass in Glass Separation;" Symposium on Nucleation and Crystallization in Glasses and Melts; The American Ceramic Society, 1962; pp. 55-62.
Karsbetter et al.; "Chemical Strengthening of Glass Ceramics in the Li.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 System"; May 1966; all pages.
Tashiro et al.; "Glass Ceramics Catalized with Zirconia"; 5th International Congress on Glass; 7-14-62; all pages.
Kistler, S. S., "Stresses in Glass Produced by Nonuniform Exchange of Monovalent Ions", J. of Am. Cer. Soc., vol. 45, No. 2, pp. 59-68, Feb. 1962.
Corning Glass Works
Fisher Richard V.
Janes Jr. Clinton S.
Patty, Jr. Clarence R.
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