Alumina porous body and method for manufacturing same

Abstract

An alumina porous body made up by binding aggregate alumina particles to each other, the aggregate alumina particles being bound to each other by a compound comprising yttrium silicate synthesized from mullite and Y 2 O 3 ; and a two-layer structure ceramic porous body with an inorganic porous film formed on the alumina porous body.

1 . An alumina porous body made up by binding aggregate alumina particles to each other,
 the aggregate alumina particles being bound to each other by a compound comprising yttrium silicate synthesized from mullite and Y 2 O 3 .   
     
     
         2 . A two-layer structure ceramic porous body with an inorganic porous film formed on the alumina porous body of  claim 1 . 
     
     
         3 . The alumina porous body of  claim 1 , wherein the mullite and Y 2 O 3  are mixed at a molar ratio of mullite to Y 2 O 3  that is within a range of from 0.5 to 7.5. 
     
     
         4 . A method of manufacturing the alumina porous body of  claim 1 , comprising:
 a first mixing step of mixing mullite and Y 2 O 3  with aggregate alumina particles;   a molding step of molding material mixed at the first mixing step into a predetermined shape; and   a firing step of firing molded body molded at the molding step at a firing temperature at which the compound is synthesized and melted to bind the alumina particles to each other.   
     
     
         5 . The method of manufacturing the alumina porous body of  claim 4 , wherein at the first mixing step, the mullite and Y 2 O 3  are mixed at a molar ratio that is within a range of from 0.5 to 7.5. 
     
     
         6 . A method of manufacturing the two-layer structure ceramic porous body with an inorganic porous film formed on an alumina porous body of  claim 2 , comprising:
 a first mixing step of mixing mullite and Y 2 O 3  with aggregate alumina particles;   a molding step of molding material mixed at the first mixing step into a predetermined shape;   a second mixing step of mixing an organic binder and water with inorganic powder making up the inorganic porous film so as to prepare slurry;   a slurry coating step of allowing the slurry prepared at the second mixing step to adhere in a layer form to a surface of molded body molded at the molding process; and   a firing step of firing the molded body with the slurry adhered in a layer form at the slurry coating step at a firing temperature at which the compound is synthesized and melted to bind the alumina particles to each other.   
     
     
         7 . The method of manufacturing the two-layer structure ceramic porous body with an inorganic porous film formed on an alumina porous body of  claim 6 , wherein at the first mixing step, the mullite and Y 2 O 3  are mixed at a molar ratio of mullite to Y 2 O 3  that is within a range of from 0.5 to 7.5.