Strengthening glass by ion exchange

Details Strengthening glass by ion exchange Strengthening glass by ion exchange

1995-12-15

1997-10-07

Czaja, Donald E.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 3014, 501 52, 501 77, C03C 304, C03C 3091, C03C 2100

Patent

active

056747900

ABSTRACT:
A method of strengthening a glass article by developing compressive stress in a surface layer on the article through an exchange of alkali metal ions in the surface layer at an elevated temperature below the glass strain point, the step of minimizing stress relaxation by carrying out the ion exchange in a glass essentially free from non-bridging oxygen atoms. Glasses having particular utility contain alumina in their compositions in such amount that the number of aluminum atoms in a glass are at least equal to the number of alkali metal ions, or contain both alumina and boric oxide in such amounts that the formula ##EQU1## is satisfied.

REFERENCES:
patent: 3615320 (1971-10-01), Junge et al.
patent: 3628934 (1971-12-01), Duthoit et al.
patent: 3779732 (1973-12-01), Spanoudis
patent: 3844754 (1974-10-01), Grubb et al.
patent: 4405672 (1983-09-01), Araujo et al.
patent: 4818648 (1989-04-01), Ohta et al.
patent: 5007948 (1991-04-01), Araujo et al.
patent: 5380596 (1995-01-01), Yoshida et al.

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