Preparation method of nano coating on surface of medical titanium alloy bone plate

Abstract

A preparation method of a nano coating on the surface of a medical titanium alloy bone plate comprises the steps that firstly, a Ti6Al4V alloy plate is preprocessed to manufacture a medical titanium alloy bone plate foundation plate; secondly, a laser device with the pulse width being 20ns, the wavelength being 1064nm and the working frequency being 5Hz is used; laser beams with the power density being 5 GW / cm < 2 >, the lap joint rate being 50% and the light spot diameter being 2.4 mm sequentially impact the upper surface and the lower surface of the Ti6Al4V alloy plate; thirdly, a titanium alloy plate and a high-purity graphite plate serve as an anode and a cathode and are placed in parallel with the distance being 3 cm, and meanwhile the titanium alloy plate and the high-purity graphite plate are immersed in the electrolyte; the electrolyte is an ethylene glycol organic electrolyte containing 0.3 wt% of NH4F and 2vol% of water; the oxidation voltage is 60 v, the oxidation time is 6 h, and a TiO2 nanotube coating is prepared; fourthly, flushing is conducted with deionized water, ultrasonic cleaning is conducted in absolute ethyl alcohol for 5 minutes, and natural airing is conducted; fifthly, heat treatment is conducted in a vacuum atmosphere furnace; the heating rate is 2 DEG C / min, heat preservation is conducted at the temperature being 450 DEG C for 2 hours, and a sample is naturally cooled to room temperature and taken out; and the wear resistance, the binding force and other properties are greatly improved.

Description

technical field [0001] The invention relates to the technical field of medical titanium alloys, in particular to a method for preparing a nano-coating on the surface of a medical titanium alloy bone plate. Background technique [0002] At present, clinically, the treatment of fracture diseases is mainly achieved through internal fixation. The internal fixation material is mainly titanium alloy (Ti6Al4V), which has the advantage of good tissue compatibility and meets the biomechanical and clinical requirements. Although the comprehensive performance of titanium alloy bone plate is excellent, there are still the following problems: [0003] (1) Titanium is a biologically inert substance and rarely forms direct chemical bonds with bone tissue. [0004] (2) At the same time, the fine wear debris produced by friction and wear will spread to the surrounding tissues of the bone plate and easily cause adverse reactions. [0005] (3) In open fracture and orthopedic implant surgery...

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Problems solved by technology

[0004] (2) At the same time, the fine wear debris generated by friction and wear will spread to the surrounding tissues of the bone plate and easily cause adverse reactions

[0005] (3) In open fracture and orthopedic implant surgery, although complete disinfection and strict aseptic operation are adopted, titanium alloy bone plate often induces bacterial infection

But currently TiO 2 The wear resistance and binding force of the nanotube coating are poor, which is not conducive to clinical application

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