A kind of nitrogen-doped titanium oxide coating and its preparation method and application
A titanium oxide, nitrogen doping technology, applied in coating, surface reaction electrolytic coating, metal material coating process, etc., can solve the problems of weakened biological activity, reduced surface hydrophilicity, and easy occurrence of bacterial infection.
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Embodiment 1
[0047] (1) Ultrasonic pickling treatment is performed on a pure titanium metal sheet of 10mm×10mm×1mm. The pickling solution is mixed with hydrofluoric acid, nitric acid and ultrapure water at a volume ratio of 1:5:34; followed by deionization Ultrasonic cleaning of water to obtain a clean and uniform surface (see figure 1 shown). Micro-arc oxidation technology is used to in-situ oxidize the titanium metal surface to form a porous titanium oxide coating (calculated as MAO). The specific process conditions and parameters are shown in Table 1. The surface topography images obtained under the process parameters are shown in Figure 2a As shown, the results show that the titanium metal surface forms a porous structure;
[0048] Table 1 is the micro-arc oxidation process conditions and parameters in the present embodiment 1:
[0049] Electrolyte 0.2M sulfuric acid solution oxidation voltage 270V electric current 1.8A frequency 800Hz duty cycl...
Embodiment 2
[0055] Step (1) of this embodiment is the same as that of Embodiment 1, and its detailed description is omitted. (2) Plasma immersion ion implantation was performed on the porous titanium oxide coating obtained by treating the titanium metal surface with the micro-arc oxidation technique in the above-mentioned embodiment 1. The specific injection parameters are shown in Table 3; the surface topography obtained under the injection parameters is shown in Figure 3b As shown, it can be seen from the figure that the porous structure of the micro-arc oxidation coating surface is retained on the surface after nitrogen ion implantation;
[0056] Table 3 shows the nitrogen ion implantation parameters in Example 2:
[0057] local vacuum 4.0×10 -3 Pa
[0058] . The nitrogen content of the nitrogen-doped titanium oxide coating (referred to as N-60) obtained in Example 2 is 2.2 at%, the pore size is 200 nm-1.7 μm, and the thickness is 2.1 μm. The obtained nitrogen-doped t...
Embodiment 3
[0060] Step (1) of this embodiment is the same as that of Embodiment 1, and its detailed description is omitted. (2) Plasma immersion ion implantation was performed on the porous titanium oxide coating obtained by treating the titanium metal surface with the micro-arc oxidation technique obtained in the above-mentioned embodiment 1. The specific injection parameters are shown in Table 4; the surface topography obtained under the injection parameters is shown in Figure 3c As shown, it can be seen from the figure that the porous structure of the micro-arc oxidation coating surface is retained on the surface after nitrogen ion implantation;
[0061] Table 4 is the nitrogen ion implantation parameters in the present embodiment 3
[0062] local vacuum 4.0×10 -3 Pa
[0063] . The content of nitrogen in the nitrogen-doped titanium oxide coating (referred to as N-90) obtained in Example 3 is 2.6 at%, the pore size is 200 nm-1.4 μm, and the thickness is 2.0 μm. The ob...
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