Glass-ceramic plate and method for making same

Abstract

The present invention relates to a glass-ceramic plate intended especially for covering heating elements and provided on at least one face with at least one enamel patch and/or at least one coat of paint, with the exception, where appropriate, of functional and/or decorative areas. The invention also relates to the process for manufacturing the plate and to the cooking appliance comprising said plate.

1 . A glass-ceramic plate comprising at least one face, wherein at least a portion of said face is coated with paint having a degradation temperature greater than 350° C. and comprising at least one silicone resin. 
     
     
         2 . The glass-ceramic plate as claimed in  claim 1 , wherein at least 40% of the surface of the at least one face is covered with the coat of paint. 
     
     
         3 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises a transparent or translucent glass-ceramic. 
     
     
         4 . The glass-ceramic plate as claimed in  claim 1 , wherein the coat of paint is on the lower face of the plate. 
     
     
         5 . The glass-ceramic plate as claimed in  claim 1 , wherein the paint further comprises pigments. 
     
     
         6 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises a glass-ceramic having an expansion coefficient of less than 15×10 −7  K −1 . 
     
     
         7 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises a light-colored glass-ceramic. 
     
     
         8 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises a glass-ceramic obtained from a glass having the following composition expressed in percentages by weight:
 SiO 2  63-70   Al 2 O 3  18-22   Li 2 O 2.5-4.5.   
     
     
         9 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises a glass-ceramic having a haze of at least 50%. 
     
     
         10 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate comprises an underceramized glass-ceramic. 
     
     
         11 . The glass-ceramic plate as claimed in  claim 1 , wherein the at least one face of the plate comprises regions not coated with paint. 
     
     
         12 . The glass-ceramic plate as claimed in  claim 1 , wherein the plate is combined with underlying induction heating elements. 
     
     
         13 . A process for manufacturing the plate as claimed in  claim 1 , comprising carrying out at least one glass plate ceramization cycle, and coating at least one of the faces of the plate with at least one coat of paint after the ceramization cycle. 
     
     
         14 . The process as claimed in  claim 13 , wherein a glass composition capable of producing a plate having a haze of at least 50% is utilized in the ceramization cycle. 
     
     
         15 . The process as claimed in  claim 13 , further comprising baking the plate by heating the plate at a temperature between 80 and 450° C. after ceramization. 
     
     
         16 . A device for cooking and/or holding at high temperature, comprising the glass-ceramic plate as claimed in  claim 1 , and a material selected from the group consisting of one or more heating elements, one or more air burners, one or more gas burners, one or more induction heating means and combinations thereof. 
     
     
         17 . The device as claimed in  claim 16 , wherein the plate is mounted on an insulating support.