Method for processing ceramic powder suspension

Abstract

A method for preparing a ceramic powder suspension is disclosed. A dispersant having a following structural formula is provided: wherein D is H or COOR 1 ; R 1 is a hydrogen atom, or an alkyl group, a cyclic aliphatic group, an aryl group, having 1 to 10 carbon atoms, or a cationic salt group; R 2 is an alkyl group having 1 to 10 carbon atoms, a cyclic aliphatic having 1 to 10 carbon atoms or an aryl group having 1 to 10 carbon atoms; R 3 is a hydrogen atom or a methyl group; Z is an oxygen atom or an NH group; A is —COO, —SO 3 or an acid form; a is an integer between 1 to 5000; and p and q are integers between 1 to 10. The dispersant is dissolved in a solvent. Ceramic powder is further added into the solvent with the dispersant.

What is claimed is:  
     
         1 . A method for processing a ceramic powder suspension, comprising: 
 providing a dispersant, wherein the dispersant has a following structure:                          wherein R is a H +  ion, an Na +  ion, an NH 4   +  ion or other cationic group; 
 m is an integer from 10 to 5000; and  
 n is an integer from 10 to 3000;  
   dissolving the dispersant in a solvent; and    adding a ceramic powder into the solvent to form a slurry.    
     
     
         2 . The method of  claim 1 , wherein the solvent comprises deionized water.  
     
     
         3 . The method of  claim 1 , wherein the ceramic powder comprises a barium titanate powder.  
     
     
         4 . The method of  claim 1 , wherein an amount of the dispersant added is about 0.5 wt % to about 3.5 wt %.  
     
     
         5 . The method of  claim 1 , wherein subsequent to adding the ceramic powder into the solvent further comprises adding a sodium hydroxide solution to adjust a pH value of the slurry.  
     
     
         6 . The method of  claim 5 , wherein a concentration of the sodium hydroxide solution is about 1N to adjust the pH value to about 12.  
     
     
         7 . The method of  claim 1 , wherein after adding the ceramic powder to the solvent further comprises ball-milling the slurry.  
     
     
         8 . The method of  claim 7 , wherein the step of ball-milling the slurry is conducted for 24 hours.  
     
     
         9 . A method for processing a ceramic powder suspension, comprising: 
 providing a dispersant having a following structure:                          wherein R 1  is an H +  ion, an Na +  ion, an NH 4   +  ion or other cationic group; 
 R 2  is an H +  ion, an Na +  ion, an NH 4   +  ion or other cationic group;  
 m is an integer from 10 to 5000; and  
 n is an integer from 10 to 3000;  
   dissolving the dispersant in a solvent; and    adding a ceramic powder into the solvent to form a slurry.    
     
     
         10 . The method of  claim 9 , wherein the solvent comprises deionized water.  
     
     
         11 . The method of  claim 9 , wherein the ceramic powder comprises a barium titanate powder.  
     
     
         12 . The method of  claim 9 , wherein an amount of the dispersant added is about 0.5 wt % to about 3.5 wt %.  
     
     
         13 . The method of  claim 9 , wherein subsequent to adding the ceramic powder into the solvent further comprises adding a sodium hydroxide solution to adjust a pH value of the slurry.  
     
     
         14 . The method of  claim 13 , wherein a concentration of the sodium hydroxide solution is 1N to adjust the pH value of the slurry to about 12.  
     
     
         15 . The method of  claim 9 , wherein after adding the ceramic powder to the solvent further comprises ball-milling the slurry.  
     
     
         16 . The method of  claim 15 , wherein the step of ball-milling the slurry is conducted for 24 hours.  
     
     
         17 . A method for preparing a ceramic powder suspension, comprising: 
 providing a dispersant having a following structure:                          wherein D is an H atom or a COOR, group;    R 1  is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a cyclic aliphatic group having 1 to 10 carbon atoms, an aryl group having 1 to 10 carbon atoms or a cationic salt group;    R 2  is an alkyl group having 1 to 10 carbon atoms, a cyclic aliphatic group having 1 to 10 carbon atoms or an aryl group having 1 to 10 carbon atoms;    R 3  is a hydrogen atom or a methyl group;    Z is an oxygen atom or an NH group;    A is a —COO group, a —SO 3  group or an acid form;    a is an integer between 1 to 5000; and    p and q are integers between 1 to 10;    dissolving a dispersant in a solvent; and    dispersing a ceramic powder into the solvent to form a slurry.    
     
     
         18 . The method of  claim 17 , wherein the solvent comprises deionzied water.  
     
     
         19 . The method of  claim 18 , wherein an amount of the dispersant added is about 0.5 wt % to about 3.5 wt %.