Titanium or titanium alloy-and-resin composite and method for making the same

Abstract

A method for making a titanium-and-resin composite or titanium alloy-and-resin composite includes: providing a titanium or titanium alloy substrate; electrochemically treating the substrate to form a titanium hydride layer; anodizing the substrate having the titanium hydride layer to form an nano-porous oxide film on the surface of the substrate, the nano-porous oxide film having nano pores and comprising at least two layers of different porosity or pore diameters; and inserting the substrate in a mold and melting resin on the surface of the nano-porous oxide film to form the composite.

What is claimed is: 
     
         1 . A method for making a titanium or titanium alloy-and-resin composite, comprising:
 providing a titanium or titanium alloy substrate;   electrochemically treating the substrate to form a titanium hydride layer on a surface thereof;   anodizing the substrate having the titanium hydride layer to form an nano-porous oxide film on the surface of the substrate, the nano-porous oxide film having nano pores and comprising at least two layers of different porosity or pore diameters; and   inserting the substrate in a mold and melting resin on the surface of the nano-porous oxide film to form the composite.   
     
     
         2 . The method as claimed in  claim 1 , wherein electrochemically treating the substrate is carried out in an acid water solution containing sulfuric acid for about 1-10 minutes with the substrate being a cathode, the molar concentration of the sulfuric acid is about 0.5 mol/L-2 mol/L, the electric current density through the acid water solution is about 0.1 A/dm 2 -5 A/dm 2 . 
     
     
         3 . The method as claimed in  claim 2 , wherein the titanium hydride layer has a thickness of about 80 nm-120 nm and a surface roughness of about 0.3 μm-0.5 μm. 
     
     
         4 . The method as claimed in  claim 1 , wherein anodizing the substrate is carried out in an alkaline water solution containing sodium hydroxide for about 1 minute-10 minutes with the substrate being an anode, the mol concentration of the sodium hydroxide is about 4.5 mol/L-5.5 mol/L, the electric current density through the alkaline water solution is about 1 A/dm 2 -30 A/dm 2 . 
     
     
         5 . The method as claimed in  claim 1 , wherein the resin is crystalline thermoplastic synthetic resin. 
     
     
         6 . The method as claimed in  claim 5 , wherein the crystalline thermoplastic synthetic resin is polyphenylene sulfide or polyamide. 
     
     
         7 . The method as claimed in  claim 5 , wherein the crystalline thermoplastic synthetic resin is polyphenylene sulfide added with fiberglass, the fiberglass has a mass percentage of about 30% with regard to the polyphenylene sulfide and the fiberglass. 
     
     
         8 . The method as claimed in  claim 1 , wherein the nano-porous oxide film is titanium dioxide film. 
     
     
         9 . The method as claimed in  claim 1 , wherein the at least two layers comprising an inner layer near the substrate and a surface layer away from the substrate, the inner layer comprising nano pores having a pore diameter at a range of about 20 nm-50 nm, the surface layer comprising nano pores having a pore diameter at a range of about 100 nm-150 nm. 
     
     
         10 . The method as claimed in  claim 9 , wherein the nano-porous oxide film has a total thickness of about 300 nm-500 nm, the surface layer has a thickness of about 80 nm-120 nm. 
     
     
         11 . The method as claimed in  claim 9 , wherein the resin composition fills the nano-pores of the inner layer and the surface layer.