Electrode support substrate for solid oxide type fuel cell, and process for producing the same

Abstract

Disclosed is an electrode support substrate for a fuel cell which is even, gives a small fluctuation in gas permeability, and is capable of carrying out printing of an anodic electrode with high adhesiveness, and which comprises a ceramic sheet having a porosity of 20 to 50%, a thickness of 0.2 to 3 mm and a surface area of 50 cm 2 or more wherein the variation coefficient of measured values of the gas permeable amounts of areas measured by the method according to JIS K 6400 ranges from 5 to 20% and further the surface roughness measured with a laser optical manner three-dimensional shape measuring device may be 1.0 to 40 μm as the maximum roughness depth (Rmax) thereof.

1 . A electrode support substrate for solid oxide type fuel cell characterized in comprising a ceramic sheet having a porosity of 20 to 50%, a thickness of 0.2 to 3 mm and a surface area of 50 cm 2  or more, and the variation coefficient of measured values of the gas permeable amounts of any area of 4 cm 2  selected optionally from the whole of the surface area of the substrate, the values being measured by the method according to JIS K 6400, is from 5 to 20%.  
   
   
       2 . The electrode support substrate according to  claim 1 , wherein a surface roughness thereof measured with a laser optical manner three-dimensional shape measuring device is 1.0 to 40 μm as the maximum roughness depth (Rmax: German Standard “DIN 4768”).  
   
   
       3 . The electrode support substrate according to  claim 1 , wherein height of burrs thereof measured with a laser optical manner three-dimensional shape measuring device is ½ or less of the thickness of the sheet.  
   
   
       4 . The electrode support substrate according to  claim 1 , wherein largest height(s) of undulations and/or projections measured with a laser optical manner three-dimensional shape measuring device is/are ⅓ or less of a thickness of the sheet.  
   
   
       5 - 9 . (canceled)  
   
   
       10 . The electrode support substrate according to  claim 2 , wherein height of burrs thereof measured with a laser optical manner three-dimensional shape measuring device is ½ or less of the thickness of the sheet.  
   
   
       11 . The electrode support substrate according to  claim 2 , wherein largest height(s) of undulations and/or projections measured with a laser optical manner three-dimensional shape measuring device is/are ⅓ or less of a thickness of the sheet.  
   
   
       12 . The electrode support substrate according to  claim 3 , wherein largest height(s) of undulations and/or projections measured with a laser optical manner three-dimensional shape measuring device is/are ⅓ or less of a thickness of the sheet.  
   
   
       13 . The electrode support substrate according to  claim 4 , wherein largest height(s) of undulations and/or projections measured with a laser optical manner three-dimensional shape measuring device is/are ⅓ or less of a thickness of the sheet.