Method for realizing surface nanocrystallization of pure titanium part with complex shape

Abstract

The invention discloses a method for realizing surface nanocrystallization of a pure titanium part in a complex shape, which comprises the following steps of: grinding and polishing the surface of the pure titanium part by using abrasive paper, and then carrying out ultrasonic cleaning and blow-drying; preparing an oxide layer with a nano structure on the surface of the sample through an anodic oxidation method; then coating the surface of the sample subjected to anodic oxidation with a layer of a reduction auxiliary agent; and finally, reduction is conducted at low temperature, the oxide can be reduced into elemental titanium through the reduction process, the nano structure is reserved, and therefore surface nanocrystallization of the pure titanium part is achieved. Compared with other surface nanocrystallization methods, the method disclosed by the invention is a chemical method, is not influenced by the shape of the workpiece during treatment, can realize nanocrystallization of the surface of the titanium part with the complex shape, and is simple in technological process, relatively low in cost, high in production efficiency and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of surface treatment of pure titanium parts, in particular to a method for realizing surface nanometerization of pure titanium parts with complex shapes. Background technique [0002] With the development of modern industry, people have higher and higher demands on the performance of materials. During the service process of materials, their damage and failure generally start from the surface, such as wear, fatigue fracture, etc. Therefore, improving the surface properties of materials can prolong the service life of materials. In recent years, relevant researchers have developed surface nanotechnology, that is, the surface grains of materials are refined to the nanometer level while the internal grains of the matrix remain in the original state. After surface nano-processing, the fine grains on the surface of the metal material can inhibit crack growth, while the internal coarse grains can resist crack growth. At t...

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Problems solved by technology

However, these methods also have some problems, such as the inability to process parts with large sizes or complex shapes, and the surface roughness of the processed materials increases greatly and microcracks are easy to occur. These problems seriously limit the application prospects of surface nanotechnology.

In response to the above problems, relevant researchers have proposed new surface nanotechnology, such as laser shock peening, water jet impact, etc., but there are also disadvantages such as expensive equipment and complicated processes.

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