SHAPED GLASS OR GLASS CERAMIC ARTICLE, METHODS FOR PRODUCING THE SAME, AND USE THEREOF

摘要

The invention provides a method for producing, without using a mold, a shaped green glass or glass ceramic article having a predefined geometry, which method permits to produce fine local textures of high surface quality and with homogeneous properties, in particular with respect to homogeneous nucleation or crystallization.

主权项

1. A shaped green glass or glass ceramic article obtained from a sheet-like starting glass, comprising:
at least one deformation of depth T, with:
T>(AdρBg)/(γI),  wherein A=area to be lowered of the starting glass, in m2, ρ=glass density, in kg/m3, g=acceleration due to gravity, in m/s2, γ=surface tension of the starting glass in the molten state, in N/m, d=thickness of the starting glass, in m, B=width of the deformation, in m, I=circumference of the deformation, in m; wherein after having been deformed, the surface of the shaped glass article has no defects greater than 1 μm.