Strengthened glass articles and method for making

Details Strengthened glass articles and method for making Strengthened glass articles and method for making

1985-06-10

1988-02-23

Kittle, John E.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428426, 428427, 428428, 428432, 428446, 428697, 428701, 428702, 501 4, C03C 1014

Patent

active

047269812

ABSTRACT:
This invention is directed to the production of unitary, transparent glass articles demonstrating exceptionally high flexural and impact strengths composed of an interior portion and an integral surface compression layer. The articles are prepared by contacting glass bodies consisting essentially, in mole percent, of 14-24% R.sub.2 O, wherein R.sub.2 O consists of 0-5% Li.sub.2 O, 0-5% K.sub.2 O, and the remainder Na.sub.2 O, 17-21% Al.sub.2 o.sub.3, 45-60% SiO.sub.2, 3-6% TiO.sub.2 and/or ZrO.sub.2, and 0-2% P.sub.2 O.sub.5, the sum of those components constituting at least 85% of the total composition, at a temperature above the annealing point of the glass with a source of Li.sup.+ ions to replace at least part of the Na.sup.+ ions and, if present, K.sup.+ ions in a surface layer with a corresponding amount of Li.sup.+ ions and to react the Li.sup.+ ions with Al.sub.2 O.sub.3 and SiO.sub.2 in the surface layer to form crystallites of beta-quartz solid solution nucleated by the TiO.sub.2 and/or ZrO.sub.2.

REFERENCES:
patent: 2779136 (1957-01-01), Hood
patent: 3649440 (1972-03-01), Megles
patent: 4507392 (1985-03-01), Rittler
Advances in Glass Technology (1962), pp. 404-411, Plenum Press, New York City, H. M. Garfinkel et al.
S. S. Kistler, "Stresses in Glass Produced by Non uniform Exchange of Monovalent Ions," Journal of the American Ceramic Society, 45, 59-68, Feb., 1962.

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