Electrode applied to discharge surface treatment and production method thereof

Abstract

An electrode applicable to discharge surface treatment is produced. This method is comprised of: kneading a composition including an electrically conductive mixed matter including a first powder obtained by at least any process selected from the group consisting of an atomizing method, a reduction method, and a carbonyl method and a second powder obtained by a crushing method, and a binder, the electrically conductive mixed matter including the second powder at a ratio of 10-65 weight %; injecting the kneaded composition into a mold to produce a green body; heating the green body so as to remove the binder from the green body; and sintering the green body excepting the binder.

1 . A method for producing an electrode applicable to discharge surface treatment, comprising:
 kneading a composition including an electrically conductive mixed matter including a first powder obtained by at least any process selected from the group consisting of an atomizing method, a reduction method, and a carbonyl method and a second powder obtained by a crushing method, and a binder, the electrically conductive mixed matter including the second powder at a ratio of 10-65 weight %;   injecting the kneaded composition into a mold to produce a green body;   heating the green body so as to remove the binder from the green body; and   sintering the green body excepting the binder.   
     
     
         2 . The method of  claim 1 , wherein the binder is mixed in the composition at a ratio of 47-55 volume % to the composition. 
     
     
         3 . The method of  claim 1 , further comprising:
 reducing an average particle size of the mixed matter to 5 μm or less.   
     
     
         4 . The method of  claim 1 , further comprising:
 processing the green body with isostatic pressure forming.   
     
     
         5 . The method of  claim 4 , wherein the binder is mixed in the composition at a ratio of 47-55 volume % to the composition. 
     
     
         6 . The method of  claim 4 , wherein the binder includes a wax having a first degreasing temperature and a synthetic resin having a second degreasing temperature, and the green body is heated up to the second degreasing temperature or higher in the step of heating the green body so as to remove the binder from the green body. 
     
     
         7 . The method of  claim 6 , further comprising:
 eluting the wax from the green body by means of a solvent before the isostatic pressure forming so as to remove the wax from the green body.   
     
     
         8 . The method of  claim 6 , further comprising:
 heating the green body up to a temperature not lower than the first degreasing temperature and not higher than the second degreasing temperature before the isostatic pressure forming so as to removing the wax from the green body.   
     
     
         9 . An electrode applicable to discharge surface treatment, produced by:
 kneading a composition including an electrically conductive mixed matter including a first powder obtained by at least any process selected from the group consisting of atomizing, a reduction method, and a carbonyl method and a second powder obtained by a crushing method, and a binder, the electrically conductive mixed matter including the second powder at a ratio of 10-65 weight %;   injecting the kneaded composition into a mold to produce a green body;   heating the green body so as to remove the binder from the green body; and   sintering the green body excepting the binder.