Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block – Surface modified glass
Patent
1991-01-25
1992-03-03
Fisher, Richard V.
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
Surface modified glass
428432, 428428, 65 31, 65601, B32B 1700
Patent
active
050931962
ABSTRACT:
Dealkalized sheet glass having a core region which is not dealkalized, having a pre-dealkalization bulk sodium ion concentration of at least 8%, calculated as weight percent sodium oxide in the sheet glass, which pre-dealkalization bulk sodium ion concentration continues to be maintained in the core region of the sheet glass, and having a surface which is dealkalized to a depth such that a sodium ion concentration gradient exists. The sodium ion depletion is maximum at the surface, the depth at which the sodium ion concentration is 90% of the pre-dealkalization bulk sodioum ion concentration is at least twice the depth at which the sodium ion concentration is 50% of the predealkalization bulk sodium ion concentration, and the sodium ion concentration at a depth of 50 nm is not more than 50% of the pre-dealkalization bulk sodium ion concentration. A long-lasting dealkalization is achieved because of a reduced tendancy to ionic migration due to the shape of said sodium ion concentration gradient.
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Mochel, E. L. et al., "Strenghtening of Glass Surfaces . . . ", J. Am. Ceramic Soc., vol. 49, No. 11, 21 Nov. 1966, pp. 585-589.
Dupont Camille
Hecq Andre
Van Baelen Karel
Bruckner John J.
Fisher Richard V.
Glaverbel
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