Titanium or titanium-alloy material with micron-nano coarse-structure surface and preparation method thereof

Abstract

The invention relates to a titanium or titanium-alloy material with a micron-nano coarse-structure surface and a preparation method thereof. According to the material, micron-scale concave-convex structures are distributed on the surface of the titanium or titanium-alloy material, and nano-scale spur structures are distributed on the surfaces of the micron-scale concave-convex structures. The preparation method comprises the steps of sanding, polishing and cleaning the surface of the titanium or titanium-alloy material, and then, carrying out electrochemical anodizing in an electrolyte containing hydrofluoric acid and an acid additive, so as to form a microscopic coarse structure, which is formed by multiple micron-nano concave-convex structures, on the surface of the titanium or titanium-alloy material. The material has the advantages that the combination with a titanium substrate is firm, the falling off is difficult, the biological activity, surface area and surface energy are higher, the material can be applied to a wide range of fields of photocatalysts, solar cells, bio-implants and the like, a better effect can be obtained, and the preparation method is low in cost and is simple and convenient in operation.

Description

technical field [0001] The invention relates to a titanium or titanium alloy material with a micron-nano rough surface and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have been used in oral implantology for many years due to their excellent biocompatibility, mechanical properties, and low elastic modulus. However, since titanium and its alloys are biologically inert materials, long-term implantation in the body may reduce the strength of osseointegration and cause the implant to loosen and fall off, eventually leading to the failure of the operation. At present, the surface activation treatment of titanium or its alloys can include roughening and coating. After roughening the surface of titanium (and its alloys) materials, the surface tension and surface energy of titanium can be increased, which can promote the adsorption, differentiation, expansion, and early healing of the interface of osteoblasts, and has achieved good result...

AI Technical Summary

Problems solved by technology

[0003] Taking titanium or titanium alloy used as an implant as an example, the roughening treatment methods that have been reported and / or adopted mainly include: a granular coating of about 300 μm is attached to the surface of the titanium material body by sintering, and its main disadvantages are: The sintered coating is thick and unevenly distributed, which will affect its mechanical strength and bonding strength with the tissue when used; the hydroxyapatite powder is sent into the plasma flame to melt and sprayed at high speed on the metal substrate to quickly solidify to form a coating. Therefore, it is difficult to maintain the original composition and lattice structure of hydroxyapatite, and the physical properties of the coating and the substrate are quite different, and the interface stress is concentrated, which reduces the bonding strength with the titanium substrate and is easy to dissolve in a long physiological environment. Absorption leads to implant loosening and surgical failure; the same method is also used to spray the surface with titanium slurry, the process is complicated, and in recent years it has been found that there are titanium particles around the implants sprayed with titanium slurry, which is easy to cause local inflammation; at room temperature Under the use of corundum or TiO 2 The sand blasting method of high-speed spraying of particles on the surface of titanium implants has problems such as contamination by impurity elements and uneven microstructure; acid etching with a mixture of hydrochloric acid, sulfuric acid, nitric acid or hydrofluoric acid and implants for a certain period of time, in Etch pits of a certain shape and size are formed on the surface, but the roughness of the method is limited, and it often needs to be combined with other surface roughening methods

Therefore, the surface roughening methods commonly used at present all have different defects.

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