Transparent colorless glass or glass-ceramic panel having an optically dense colored coating and method of making same

Abstract

A transparent, colorless glass or glass-ceramic panel has a visually dense, high-temperature-stable coating having an organic/inorganic network structure containing filling material particles and a color-imparting pigment. The mechanically stable, visually dense coating has no melt-reaction zone at the surface of the panel, which is coated with the coating, so that it does not impair the panel strength. The inorganic network structure can be made from a SiO 2 -based sol. The coating is made by introducing the color-imparting pigment and the filling material particles into a reactive organic/inorganic network structure; applying the resulting organic/inorganic network structure containing the pigment and the filling material particles to the panel to coat the panel and then burning-in the organic/inorganic network structure with the pigment and the filling material particles under thermal conditions to form the coating with no melt-reaction zone.

1 - 10 . (canceled) 
     
     
         11 . A method for coating a transparent, colorless glass or glass-ceramic panel exposed to heat loads during operation, with a visually dense, high-temperature-stable coating, said method comprising the steps of:
 a) making a reactive organic/inorganic network structure comprising a plurality of components;   b) introducing at least one color-imparting pigment and filling material particles in predetermined amounts into the organic/inorganic network structure and/or into the components of the network structure;   c) applying the organic/inorganic network structure including the at least one color-imparting pigment and the filling material particles introduced in step b) to said glass or glass-ceramic panel to coat the glass or glass-ceramic panel; and   d) burning-in the organic/inorganic network structure including the at least one color-imparting pigment and the filling material particles under thermal conditions to form a paint coating on the glass or glass-ceramic panel, so that no melt-reaction zone is formed between the paint coating and the glass or glass-ceramic panel at a surface coated with said paint coating.   
     
     
         12 . The method as defined in  claim 11 , wherein said organic/inorganic network structure is prepared from a sol-gel. 
     
     
         13 . The method as defined in  claim 12 , wherein said sol-gel is made from a SiO 2 -based sol. 
     
     
         14 . The method as defined in  claim 13 , wherein said SiO 2 -based sol is prepared with silane or siloxane starting materials. 
     
     
         15 . The method as defined in  claim 14 , wherein said silane or siloxane starting materials comprise tetraethyl-ortho-silicate or a derivative thereof. 
     
     
         16 . The method as defined in  claim 13 , wherein said SiO 2 -based sol is prepared with silane or siloxane starting materials, and with water, acid and at least one organic solvent as additional starting materials. 
     
     
         17 . The method as defined in  claim 12 , wherein said sol-gel and said at least one color-imparting pigment are mixed in equal parts by weight. 
     
     
         18 . The method as defined in  claim 11 , wherein said filling material particles comprise pyrolytically deposited SiO 2 , TiO 2 , talc, calcium carbonate or barium sulfate particles. 
     
     
         19 . The method as defined in  claim 11 , wherein said applying of the organic/inorganic network structure containing said at least one color-imparting pigment and said filling material particles comprises spraying or screen printing. 
     
     
         20 . The method as defined in  claim 11 , further comprising drying the glass or glass-ceramic panel coated with the organic/inorganic network structure including the at least one color-imparting pigment and the filling material particles at room temperature for at least five minutes or at an elevated temperature for a few minutes. 
     
     
         21 . The method as defined in  claim 20 , wherein said glass or glass-ceramic panel is dried for a half hour at said room temperature or at 50° C. for said few minutes. 
     
     
         22 . The method as defined in  claim 20 , wherein, after the drying, the organic/inorganic network structure including the at least one color-imparting pigment and the filling material particles is burned into the glass or glass-ceramic panel at a temperature of about 180° C. for about 20 minutes. 
     
     
         23 - 41 . (canceled)