US 12,466,765 B2
Transparent glass ceramic and cover pane
Meike Schneider, Mainz (DE); Bernd Rüdinger, Mainz (DE); and Uwe Martens, Mainz (DE)
Assigned to SCHOTT AG, Mainz (DE)
Filed by SCHOTT AG, Mainz (DE)
Filed on Dec. 15, 2023, as Appl. No. 18/542,213.
Claims priority of application No. 10 2022 133 594.1 (DE), filed on Dec. 16, 2022.
Prior Publication US 2024/0199473 A1, Jun. 20, 2024
Int. Cl. C03C 10/00 (2006.01); C03B 32/02 (2006.01); C03C 21/00 (2006.01); H05K 5/03 (2006.01)
CPC C03C 10/0009 (2013.01) [C03B 32/02 (2013.01); C03C 10/0054 (2013.01); C03C 21/002 (2013.01); H05K 5/03 (2013.01); C03C 2204/00 (2013.01)] 23 Claims
 
22. A method for producing a prestressed glass ceramic, further comprising the steps of: producing a silicate green glass by a melting process and subsequent hot shaping; temperature treating the silicate green glass with at least one nucleation step carried out in a temperature range of 690° C. to 850° C. for a period of 5 minutes to 72 hours and at least one ceramization step carried out in a temperature range of 780° C. to 1100° C. for 3 minutes to 150 hours; performing at least one ion exchange in an exchange bath having a composition of: 100% by weight to 0% by weight KNO3, 0% by weight to 100% by weight NaNO3, and 0% by weight to 5% by weight LiNO3 at a temperature of the exchange bath between 370° C. and 500° C. and for between 2 hours and 50 hours.