Casting member and method for manufacturing same

Abstract

Disclosed are an inexpensive casting member on which a film with high peel strength is formed, and a method for manufacturing the casting member. A surface-treated mold ( 1 ) includes a metal mold ( 10 ) having the molding surface including a plurality of protrusions ( 11 ) each having an inverse-slope shape, and a carbon film ( 20 ) formed on the molding surface of the metal mold ( 10 ). The surface-treated mold ( 1 ) is manufactured through a step (S 1 ) including a modeling step (S 10 ) for producing the metal mold ( 10 ), by means of selective laser sintering, which has the molding surface including the plurality of protrusions ( 11 ) each having the inverse-slope shape, and a film-forming step (S 20 ) for forming the carbon film ( 20 ) on the molding surface of the metal mold ( 10 ) produced in the modeling step (S 10 ).

1 . A casting member used for casting, comprising:
 a base material manufactured by means of selective laser sintering, which has a surface including a plurality of minute irregularities each having an inverse-slope shape; and   a film formed on the surface of the base material.   
     
     
         2 . The casting member according to  claim 1 , wherein
 the base material is a metal mold having a molding surface, and   the film is formed on the molding surface of the metal mold.   
     
     
         3 . A method for manufacturing a casting member used for casting, comprising:
 a modeling step for producing a base material, by means of selective laser sintering, which has a surface including a plurality of minute irregularities each having an inverse-slope shape; and   a film-forming step for forming a film on the surface of the base material produced in the modeling step.   
     
     
         4 . The method according to  claim 3 , wherein
 the film is a carbon film including at least one kind of nanocarbon, and   in the film-forming step, the carbon film is formed on the surface of the base material by heating the base material while supplying a reactive gas used to make the carbon film.   
     
     
         5 . The method according to  claim 4 , wherein
 a temperature and a time for heating the base material in the film-forming step are set to a temperature and a time for performing an aging treatment for hardening the base material, respectively.