Method for producing glass or glass ceramic and in particular glass or glass ceramic article

Abstract

In order to obtain glass or glass ceramic materials having increased strength, a method is provided for producing glass or glass ceramic articles, which comprises: producing an initial glass body, mounting the initial glass body on a gas cushion between a levitation support and the initial glass body, and at least partially ceramizing the initial glass body on the levitation support. The levitation support comprises at least one continuous surface region having at least one gas feed region where levitation gas for the gas cushion is fed out from the levitation support, and at least one gas discharge region where gas from the gas cushion is at least partially discharged into the levitation support.

What is claimed is: 
     
         1 . A glass or glass ceramic article produced in accordance with a process comprising the steps of:
 producing an initial glass body;   mounting the initial glass body on a gas cushion between a levitation support and the initial glass body; and   at least partially ceramizing the initial glass body on the levitation support;   wherein the levitation support has at least one continuous surface region with at least one gas feed region where levitation gas for the gas cushion is fed out from the levitation support, and at least one gas discharge region where gas from the gas cushion is at least partially discharged into the levitation support.   
     
     
         2 . The glass or glass ceramic article as claimed in  claim 1 , wherein the glass or glass ceramic article has an average breaking fall height which is at least 15 cm per millimeter thickness of the glass or glass ceramic article in a range of between 3 and 5 millimeters thickness with the format 10×10 cm and a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         3 . The glass or glass ceramic article as claimed in  claim 1 , wherein the glass or glass ceramic article has an average breaking fall height which is at least 20 cm per millimeter thickness of the glass or glass ceramic article in a range of between 3 and 5 millimeters thickness with the format 10×10 cm and a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         4 . The glass or glass ceramic article as claimed in  claim 1 , wherein the glass or glass ceramic article has an average breaking fall height which is at least 30 cm per millimeter thickness of the glass or glass ceramic article in a range of between 3 and 5 millimeters thickness with the format 10×10 cm and a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         5 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that is breakproof on average with a fall height of more than 45 centimeters in the form of a 3 millimeter thick plate plane on both sides with the format 10×10 cm and in a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         6 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that is breakproof on average with a fall height of at least 60 centimeters in the form of a 3 millimeter thick plate plane on both sides with the format 10×10 cm and in a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         7 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that is breakproof on average with a fall height of at least 80 centimeters in the form of a 3 millimeter thick plate plane on both sides with the format 10×10 cm and in a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         8 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that is breakproof on average with a fall height of at least 140 centimeters in the form of a 5 millimeter thick plate plane on both sides with the format 10×10 cm and in a steel ball dropping test with a steel ball of mass 200 g. 
     
     
         9 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that is breakproof on average with a fall height of at least x centimeters at least 60 centimeters in the form of a thick plate plane on both sides with the format 10×10 cm and with a thickness in the range of from 3 to 5 millimeters in a steel ball dropping test with a steel ball of mass 200 g, where x is given by the interpolation relation: x=(140 cm−55 cm)/2 mm*(plate thickness in mm−3 mm)+55 cm. 
     
     
         10 . The glass or glass ceramic article as claimed in  claim 1 , comprising a plate which is smooth on both sides. 
     
     
         11 . The glass or glass ceramic article as claimed in  claim 1 , comprising a plate which is knopped on one side. 
     
     
         12 . The glass or glass ceramic article as claimed in  claim 1 , wherein the article has a fire-polished surface. 
     
     
         13 . The glass or glass ceramic article as claimed in  claim 1 , comprising a curved plate. 
     
     
         14 . The glass or glass ceramic article as claimed in  claim 13 , wherein the glass or glass ceramic article has uniaxial curvature. 
     
     
         15 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material of at least one of the systems:
   SiO 2 —Al 2 O 3 —Li 2 O,
     SiO 2 —Al 2 O 3 —MgO,
     SiO 2 —Al 2 O 3 —BaO.
   
     
     
         16 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that has at least one of the oxides TiO 2 , ZrO 2 , P 2 O 5 . 
     
     
         17 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that has the following components in percent by weight: 
       
         
           
                 
                 
                 
               
                     
                 
                     
                   Li 2 O 
                   2.5-5.5%,   
                 
                     
                   Na 2 O 
                   0-3.0%, 
                 
                     
                   K 2 O 
                   0-3.0%, 
                 
                     
                   ΣNa 2 O + K 2 O 
                   0-4.0%, 
                 
                     
                   MgO 
                   0-3.0%, 
                 
                     
                   CaO 
                   0-2.5%, 
                 
                     
                   SrO 
                   0-2%,   
                 
                     
                   BaO 
                   0-3.5%, 
                 
                     
                   ZnO 
                   0-3.5%, 
                 
                     
                   Al 2 O 3   
                   18-27%,   
                 
                     
                   SiO 2   
                   52-75%,   
                 
                     
                   TiO 2   
                   1.0-5.5%,   
                 
                     
                   ZrO 2   
                   0-3.0%, 
                 
                     
                   SnO 2   
                   <1.0%, 
                 
                     
                   ΣTiO 2  + ZrO 2  + SnO 2   
                   2.0-6.0%,   
                 
                     
                   P 2 O 5   
                   0-8.0%. 
                 
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         18 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that has the following components: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Component: 
                   Proportion: 
                 
                     
                     
                 
                     
                   SiO 2   
                   63-67,  
                 
                     
                   Al 2 O 3   
                   22 to 24,  
                 
                     
                   Li 2 O 
                   2.5-4,  
                 
                     
                   Na 2 O 
                   0-0.5,  
                 
                     
                   MgO 
                   0.2-0.8, 
                 
                     
                   BaO 
                   0-0.5,  
                 
                     
                   ZnO 
                   0-0.5,  
                 
                     
                   ZrO 2   
                   2-2.5,  
                 
                     
                   TiO 2   
                   1.5-2.5,  
                 
                     
                   As 2 O 3   
                   1.0-2.5,  
                 
                     
                   P 2 O 5   
                   0.5-1.5,  
                 
                     
                   K 2 O 
                   0-0.5,  
                 
                     
                   V 2 O 3   
                   0-0.1, 
                 
                     
                     
                 
             
                
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         or the following components: 
       
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   Component: 
                   Proportion: 
                 
                     
                     
                 
                     
                   SiO 2   
                   65-69,  
                 
                     
                   Al 2 O 3   
                   19 to 21,  
                 
                     
                   Na 2 O 
                   0-0.5,  
                 
                     
                   MgO 
                   0.5-1.5,  
                 
                     
                   BaO 
                   0.5-1.5, 
                 
                     
                   ZnO 
                   1.5-2,  
                 
                     
                   ZrO 2   
                   1.5-2,  
                 
                     
                   TiO 2   
                   2-3,  
                 
                     
                   As 2 O 3   
                   0.5-1,  
                 
                     
                   K 2 O 
                   0-0.5, 
                 
                     
                     
                 
             
                
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
         in percent by weight. 
       
     
     
         19 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that has at least one of the fining agents As 2 O 3 , Sb 2 O 3 , CeO 2 , SnO 2 . 
     
     
         20 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material that has at least one coloring oxide. 
     
     
         21 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material whose composition comprises from 0.02 to 0.6 percent by weight of V 2 O 5 . 
     
     
         22 . The glass or glass ceramic article as claimed in  claim 1 , comprising a material whose composition has at least one compound from a group which comprises Cr, Mn, Fe, Co, Cu, Ni, Se, Cl compounds. 
     
     
         23 . The glass or glass ceramic article as claimed in  claim 1 , wherein the glass ceramic article is ceramized surface-wide. 
     
     
         24 . The glass or glass ceramic article as claimed in  claim 1 , wherein the glass ceramic article is not chemically prestressed. 
     
     
         25 . A hotplate comprising a glass or glass ceramic article as claimed in  claim 1 . 
     
     
         26 . A flameproof pane or fireproof glazing comprising a glass or glass ceramic article as claimed in  claim 1 . 
     
     
         27 . A stove windowpane comprising a glass or glass ceramic article as claimed in  claim 1 . 
     
     
         28 . Security glazing, in particular armored glass, particularly preferably bulletproof armored glass, comprising a glass or glass ceramic article as claimed in  claim 1 .