Method for producing a chemically pretensioned glass body

Details Method for producing a chemically pretensioned glass body Method for producing a chemically pretensioned glass body

1997-10-27

1999-03-02

Chin, Peter

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 3013, 65 3014, 65 992, 65 993, 65 994, 501 55, 501 65, 501 66, 501 67, 501 11, 501 53, C03C 1500

Patent

active

058764720

ABSTRACT:
The invention is directed to a method of producing a chemically pretensioned glass body. In the method, a glass body is provided having a composition in percent by weight on oxide basis: SiO.sub.2 70-85; B.sub.2 O.sub.3 8-15; Na.sub.2 O 1-5; K.sub.2 O 1-<5; Al.sub.2 O.sub.3 1-5; MgO 0-3; SrO+BaO 0-2; CaO 0-3; ZnO 0-3; with CaO+ZnO 2-6; and, ZrO.sub.2 0-3.5. The glass body is placed in an ion exchange salt bath containing at least 90% by weight of potassium salts. The salt bath is maintained at a temperature below the transformation point Tg of the glass defined by the glass composition for a duration of at least 2.0 hr causing potassium ions from the salt bath to migrate into the surface region of the glass body to thereby produce the chemically pretensioned glass body.

REFERENCES:
patent: 3287200 (1966-11-01), Hess et al.
patent: 3556757 (1971-01-01), Kozlowski et al.
patent: 4108621 (1978-08-01), Asahara et al.
patent: 4870034 (1989-09-01), Kiefer
patent: 5114453 (1992-05-01), Ross et al.
patent: 5268335 (1993-12-01), Kerko et al.
patent: 5599753 (1997-02-01), Watzke et al.
"Festigkeitserhoung von Glasern durch Oberflachenbehandlung" by Schroder et al, Naturwissenschaften 57, (1970), pp. 533 to 541.

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