Titanium material and method for manufacturing titanium material

Abstract

In a titanium material, when a chemical composition of a surface is analyzed by X-ray photoelectron spectroscopy, the titanium material contains, as a composition of the surface, Zn: 0.1 atom% or more and Ca: 0.5 atom% or more, and the titanium material contains, as a composition of a surface oxide film, C: 20.0 atom% or less and F: 5.0 atom% or less.

What is claimed is: 
     
         1 . A titanium material, 
 wherein, when a chemical composition of a surface is analyzed by X-ray photoelectron spectroscopy, the titanium material contains, as a composition of the surface;   Zn: 0.1 atom% or more, and   Ca: 0.5 atom% or more, and   the titanium material contains, as a composition of a surface oxide film;   C: 20.0 atom% or less, and   F: 5.0 atom% or less.   
     
     
         2 . The titanium material according to  claim 1 , 
 wherein the surface oxide film has a thickness of 5 to 20 nm.   
     
     
         3 . A method for manufacturing a titanium material, comprising: 
 cleaning a titanium raw material,   wherein the cleaning includes;   immersing the titanium raw material in an aqueous solution having a temperature of 40° C. to 60° C. for 1.0 minutes or longer,   where the aqueous solution contains,   a zinc salt: 0.00030 to 0.65000 mass% in terms of Zn,   a calcium salt: 0.00060 to 0.40000 mass% in terms of Ca,   HF: 1.0 to 6.0 mass%, and   HNO 3 : 4.0 to 10.0 mass%, and   washing the titanium raw material lifted from the aqueous solution with water.   
     
     
         4 . The method for manufacturing a titanium material according to  claim 3 , 
 wherein the zinc salt is 0.00030 to 0.00100 mass% in terms of Zn, and   the calcium salt is 0.00060 to 0.00108 mass% in terms of Ca.   
     
     
         5 . The method for manufacturing a titanium material according to  claim 3 , 
 wherein the zinc salt is ZnCl 2 .   
     
     
         6 . The method for manufacturing a titanium material according to  claim 3 , 
 wherein the calcium salt is CaCl 2 .   
     
     
         7 . The method for manufacturing a titanium material according to  claim 5 , 
 wherein the calcium salt is CaCl 2 .   
     
     
         8 . The method for manufacturing a titanium material according to  claim 3 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         9 . The method for manufacturing a titanium material according to  claim 5 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         10 . The method for manufacturing a titanium material according to  claim 6 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         11 . The method for manufacturing a titanium material according to  claim 7 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         12 . The method for manufacturing a titanium material according to  claim 4 , wherein the zinc salt is ZnCl 2 . 
     
     
         13 . The method for manufacturing a titanium material according to  claim 4 , wherein the calcium salt is CaCl 2 . 
     
     
         14 . The method for manufacturing a titanium material according to  claim 12 , wherein the calcium salt is CaCl 2 . 
     
     
         15 . The method for manufacturing a titanium material according to  claim 4 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         16 . The method for manufacturing a titanium material according to  claim 12 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         17 . The method for manufacturing a titanium material according to  claim 13 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.   
     
     
         18 . The method for manufacturing a titanium material according to  claim 14 , further comprising:
 heating the titanium raw material after the cleaning to 300° C. to 900° C. in an inert atmosphere.