Patent ID: 7406841
Filing Date: 2008-08-05
Classification: C03B,C03C,G03F

Abstract:
1. A process for producing a glass-ceramic which has a zero crossing of the CTE-T curve at a selected temperature T A ±10° C., comprising providing a glass-ceramic or a green body of a glass-ceramic and ceramicizing in accordance with a ceramicizing program, determination of which comprises determining the CTE-T curve, wherein a) the determination of the CTE-T curve comprises providing a green body or a pre-ceramicized glass-ceramic, determining Δl/l matching a polynomial to the Δl/l deriving the polynomial to obtain a CTE-T curve; or b) the zero crossing of the CTE-T curve is set at T A ±7° C.; or c) the zero crossing of the CTE-curve is set at T A ±5° C.; or d) the glass-ceramic is ceramicized in at least two ceramicizing steps.