Importance

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Abstract

The invention relates to a process for manufacturing a flat ribbon of precursor glass for a glass-ceramic, comprising the continuous floating of the molten glass on a bath of molten metal in a float chamber, said glass being poured in the molten state at a temperature above its devitrification onset temperature onto the molten metal upstream of the chamber, said glass progressively forming a ribbon that runs along said metal bath, the cooling rate of the glass being at least 18° C./min between, on the one hand, the moment when the glass is at the theoretical temperature for which the devitrification rate is a maximum and, on the other hand, the later moment when the glass is at the theoretical temperature at which the devitrification crystal growth rate becomes less than 1 micron per minute. The glass thus floated does not undergo any devitrification.

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First Claim