Titanium-based material having visible light response and excellent in photocatalytic activity and method of production of same
View Patent ↗The provision of beautiful colored titanium which is excellent in adhesion of the pure titanium or a titanium alloy with the base material, is excellent in photocatalytic activity, and further is excellent in design properties and a method of production of the same which is excellent in productivity and uses an anodic oxidation process is made the object. A titanium-based material having visible light response and excellent in photocatalytic activity characterized in that the material has pure titanium or titanium alloy as a base material, a thickness of a titanium oxide layer which is present on its surface is 0.1 μm to 5.0 μm in range, said titanium oxide layer contains anatase-type titanium dioxide and titanium bonded with hydroxy groups, and further said titanium oxide layer contains nitrogen and carbon respectively in 0.5 to 30 mass %.
1. A titanium-based material characterized in that the material has pure titanium or titanium alloy as a base material, a thickness of a titanium oxide layer which is present on its surface is 0.1 μm to 5.0 μm in range, said titanium oxide layer contains anatase-type titanium dioxide and titanium bonded with hydroxy groups, and further said titanium oxide layer contains nitrogen and carbon respectively in 0.5 to 30 mass %.
2. A titanium-based material as set forth in claim 1 , characterized in that at least one type of the titanium carbide and titanium nitride is contained in said titanium oxide layer.
3. A titanium-based material as set forth in claim 1 or 2 , characterized in that a base material of said pure titanium or titanium alloy is a sheet member.
4. A titanium-based material as set forth in claim 1 or 2 , characterized in that a base material of said pure titanium or titanium alloy is a foil.
5. A titanium-based material as set forth in claim 1 or 2 , characterized in that a base material of said pure titanium or titanium alloy is a continuous long coil of a sheet member or foil.
6. A titanium-based material as set forth in claim 1 or 2 , characterized in that a base material of said pure titanium or titanium alloy is a mesh-shaped structural member.
7. A method of production of a titanium-based material as set forth in claim 1 or 2 , characterized by treating by anodic oxidation a base material comprised of pure titanium or titanium alloy in an aqueous solution containing 0.01 M to a saturation concentration of nitric acid ions by 10V to less than 100V for 30 seconds to 60 minutes.
8. A method of production of a titanium-based material as set forth in claim 7 , characterized by treating by anodic oxidation a base material comprised of pure titanium or titanium alloy in an aqueous solution containing 0.01M to a saturation concentration of nitric acid ions and having a pH of 12 to 15 for 30 seconds to 60 minutes.
9. A method of production of a titanium-based material as set forth in claim 1 or 2 , characterized by treating by anodic oxidation a base material comprised of pure titanium or titanium alloy in an aqueous solution containing 0.01 M to a saturation concentration of nitric acid ions by 10V to less than 100V for 30 seconds to 60 minutes, then suitably thereafter treating it by heat in a 200° C. to 750° C. temperature region for 1 minute to 2 hours.
10. A titanium-based material characterized by comprising titanium oxide particles containing anatase-type titanium dioxide and titanium bonded with hydroxy groups and, further, containing nitrogen and carbon respectively in 0.5 to 30 mass % in the titanium oxide.
11. A titanium-based material as set forth in claim 10 , characterized in that at least one type of the titanium carbide and titanium nitride is contained in said titanium oxide particles.
12. A method of production of a titanium-based material as set forth in claim 10 or 11 , characterized by treating by anodic oxidation pure titanium or a titanium alloy in an aqueous solution containing 0.01M to a saturation concentration of nitric acid ions by 10V to 100V to thereby generate titanium oxide particles.
13. A method of production of a titanium-based material as set forth in claim 12 , characterized by treating by anodic oxidation pure titanium or a titanium alloy in an aqueous solution containing 0.01M to a saturation concentration of nitric acid ions and having a pH of 12 to 15.
14. A method of production of a titanium-based material as set forth in claim 10 or 11 , characterized by treating by anodic oxidation pure titanium or a titanium alloy in an aqueous solution containing 0.01M to a saturation concentration of nitric acid ions by 10V to less than 100V, then treating it by heat at 200° C. to 750° C. in temperature region for 1 minute to 24 hours to thereby generate titanium oxide particles.