Patent ID: 6843073

Claim:
A method for ceramizing starting glass of glass-ceramics into glass-ceramics, comprising at least the following steps: heating the starting glass from an initial temperature T 1 to a temperature T 2 which is disposed above the glass transformation temperature T G at which crystallization nuclei are precipitated; holding the glass at temperature T 2 for a period t 2 for the precipitation of crystallization nuclei; further heating the glass to a temperature T 3 at which a crystal phase grows on the nuclei formed following the preceding steps; holding the glass for a period t 3 at a temperature T 3 or heating during this period to a higher temperature T 4 until predetermined properties of the glass-ceramics have been reached; and controlling a temperature curve relating to the glass temperature with the help of a control loop comprising at least one temperature sensor for sensing the temperature and a heating unit as an actuator, wherein the heating unit comprises short-wave IR radiators that heat the glass to be relaxed with a thermal dead time of less than 10 secs. and the heating unit IR radiators are of a high color temperature >1,500° C., wherein the IR radiators of the heating unit comprise an IR radiation cavity defining a bordered space having at least one of reflective and backscattering boundary surfaces.