Powder contact member and method for surface treatment of powder contact member

Abstract

A powder-contacting member that prevents adhesion of powder even when the powder coming into contact with a surface is not only in the form of a single particle but also in the form of a layer, and has high flowability, and a method for the surface treatment of a powder-contacting member. The powder-contacting member has a surface with which powder comes into contact and on which surface treatment is performed. An arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm2) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (μm) of the surface is 0.02 to 3.00.

1 . A powder-contacting member having a surface with which powder comes into contact and on which surface treatment is performed, wherein
 an arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm 2 ) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (μm) of the surface is 0.02 to 3.00.   
     
     
         2 . The powder-contacting member according to  claim 1 , wherein
 the powder-contacting member is formed of a steel material.   
     
     
         3 . The powder-contacting member according to  claim 1 , wherein
 the powder-contacting member is formed of a ceramic material.   
     
     
         4 . The powder-contacting member according to  claim 1 , wherein
 the surface treatment is blasting process.   
     
     
         5 . The powder-contacting member according to  claim 2 , wherein
 the surface treatment is blasting process.   
     
     
         6 . The powder-contacting member according to  claim 3 , wherein
 the surface treatment is blasting process.   
     
     
         7 . The powder-contacting member according to  claim 1 , wherein
 the surface treatment is any of hand polishing, lapping, buffing, CMP, laser machining, etching, and cutting.   
     
     
         8 . A method for surface treatment of a powder-contacting member having a surface with which powder comes into contact, the method comprising:
 performing surface treatment on the surface such that an arithmetic average peak curvature Spc (1/mm) of the surface is 150 to 400, a peak density Spd (piece/mm 2 ) of the surface is 10000 to 180000, a root mean square gradient Sdq of the surface is 0.05 to 0.30, and an arithmetic average height Sa (μm) of the surface is 0.02 to 3.00.   
     
     
         9 . The method for surface treatment of a powder-contacting member according to  claim 8 , wherein
 the surface treatment is blasting process.   
     
     
         10 . The method for surface treatment of a powder-contacting member according to  claim 9 , wherein
 an abrasive used in the blasting process is an elastic abrasive obtained by dispersing an abrasive grain into an elastic material or an elastic abrasive obtained by adhering an abrasive grain to a surface of a core formed of an elastic material.   
     
     
         11 . The method for surface treatment of a powder-contacting member according to  claim 9 , wherein
 an abrasive used in the blasting process is a metal-based abrasive or a ceramic-based abrasive.   
     
     
         12 . The method for surface treatment of a powder-contacting member according to  claim 9 , wherein
 a particle size of the abrasive used in the blasting process is #30 to #20000.   
     
     
         13 . The method for surface treatment of a powder-contacting member according to  claim 10 , wherein
 a particle size of the abrasive used in the blasting process is #30 to #20000.   
     
     
         14 . The method for surface treatment of a powder-contacting member according to  claim 11 , wherein
 a particle size of the abrasive used in the blasting process is #30 to #20000.   
     
     
         15 . The method for surface treatment of a powder-contacting member according to  claim 9 , wherein
 the abrasive used in the blasting process is ejected with an ejection pressure of 0.01 to 0.5 MPa and an ejection distance of 50 to 150 mm.   
     
     
         16 . The method for surface treatment of a powder-contacting member according to  claim 10 , wherein
 the abrasive used in the blasting process is ejected with an ejection pressure of 0.01 to 0.5 MPa and an ejection distance of 50 to 150 mm.   
     
     
         17 . The method for surface treatment of a powder-contacting member according to  claim 11 , wherein
 the abrasive used in the blasting process is ejected with an ejection pressure of 0.01 to 0.5 MPa and an ejection distance of 50 to 150 mm.   
     
     
         18 . The method for surface treatment of a powder-contacting member according to  claim 12 , wherein
 the abrasive used in the blasting process is ejected with an ejection pressure of 0.01 to 0.5 MPa and an ejection distance of 50 to 150 mm.   
     
     
         19 . The method for surface treatment of a powder-contacting member according to  claim 8 , wherein
 the surface treatment is any of hand polishing, lapping, buffing, CMP, laser machining, etching, and cutting.