Method for manufacturing a panel of anisotropic ceramic glass

Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass

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23296, 65 29, C03B 2702

Patent

active

042317762

ABSTRACT:
A method for manufacturing a panel of anisotropic ceramic glass comprising acicular crystals enclosed in a vitreous matrix, the crystals being orientated perpendicularly to the panel faces and traversing the panel from one side to the other, in which a homogeneous mineral composition capable of forming a ceramic glass is subjected to heat treatment consisting of bringing said layer to a temperature at least equal to its working temperature and greater than the crystallization temperature of the crystalline phase, and establishing therein a thermal gradient perpendicular to its faces, and then progressively and gradually lowering the temperature of the layer starting from one of its faces, in such a manner as to successively bring each transverse plane of the layer to a temperature lower than the crystallization range of the crystalline phase, so as to induce nucleation of the crystalline phase in that face plane which is at the lowest temperature while maintaining the thermal gradient such as to orientate the direction of maximum growth of the crystals perpendicular to the faces of the layer is characterized in that the heat treatment is carried out by placing the layer of vitreous composition on the surface of a fused metal bath the lower face of the layer of vitreous composition in contact with the bath surface being at a higher temperature than the upper free face of the layer, and simultaneously controlling the temperature of the two faces of said layer to maintain a constant thermal gradient.

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