US 12,459,847 B2
Glass ceramic and method for producing a glass ceramic
Olaf Claußen, Undenheim (DE); Steffen Grün, Wallhausen (DE); Thomas Lifka, Mainz-Bretzenheim (DE); and André Schrepfer, Frankfurt a. M. (DE)
Assigned to Schott AG, Mainz (DE)
Filed by Schott AG, Mainz (DE)
Filed on Sep. 8, 2022, as Appl. No. 17/940,639.
Claims priority of application No. 10 2021 123 303.8 (DE), filed on Sep. 8, 2021; and application No. 10 2021 123 304.6 (DE), filed on Sep. 8, 2021.
Prior Publication US 2023/0081248 A1, Mar. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C03B 5/225 (2006.01); C03B 5/235 (2006.01); C03B 32/02 (2006.01); C03C 1/00 (2006.01); C03C 10/00 (2006.01)
CPC C03B 5/225 (2013.01) [C03B 5/2353 (2013.01); C03B 32/02 (2013.01); C03C 1/004 (2013.01); C03C 10/0027 (2013.01); C03C 2204/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for producing a glass ceramic, the method comprising the steps of:
providing a batch of raw materials;
heating the batch of raw materials until a melt is obtained, the batch of raw materials being heated at least in a plurality of sections to a temperature above T3 which corresponds to a viscosity of a molten glass of 103 dPa*s;
refining the melt, the melt being heated at least in a plurality of sections to a temperature above T2.5 which corresponds to a viscosity of the molten glass of 102.5 dPa*s;
obtaining a refined glass which is configured for being ceramized to form a glass ceramic material; and
ceramizing the refined glass to form the glass ceramic material, wherein at least one of the step of heating until the melt is obtained and the step of refining being performed with heating is by way of H2 and O2 combustion, wherein a Fe2+ to Fe3+ ratio in the glass ceramic or in the refined glass which can be ceramized to form the glass ceramic material is at least 0.01.