Method for preparing colorful titanium dioxide film on surface of porous NiTi alloy at low temperature

Abstract

The invention discloses a method for preparing a colorful titanium dioxide film on a surface of porous NiTi alloy at low temperature, comprising the following steps: 1. carrying out preprocessing, deoiling, SiC sand paper grinding, mechnical polishing and electrochemical polishing on the surface of the porous NiTi alloy; 2. carrying out hydrothermal treatment on the preprocessed porous NiTi alloy in a high-pressure hydrothermal kettle containing deionized water, wherein the deionized water is 30-70% by volume of the high-pressure hydrothermal kettle, the hydrothermal treatment temperature is 200-300 DEG C, and the processing time lasts for 8-12 hours; and 3. washing, naturally drying or drying at the temperature of 50-80 DEG C, thus obtaining the porous NiTi alloy provided with the colorful titanium dioxide film. the preparation method is simple, ensures low cost, is not influenced by the shape of the porous NiTi alloy, ensures no environment pollution, and can be used for repair and replacement on hard tissues such as bones, joints, artificial fangs and the like, and the bright color of the film can play roles in identification and attractiveness.

Description

technical field [0001] The invention relates to a method for preparing a colored titanium dioxide film, in particular to a method for preparing a colored titanium dioxide film at a low temperature on the surface of a porous NiTi alloy. Background technique [0002] In recent decades, the research and development of biomedical materials have made remarkable achievements, making millions of patients recover and greatly improving people's quality of life. With the development of science and technology, the aging population and the increase of trauma caused by various accidents, people's demand for biomedical materials and their products is increasing. At present, medical metal materials are most commonly used in human body load-bearing hard tissue implants, such as medical stainless steel, cobalt-chromium alloy, titanium and titanium alloy, and NiTi shape memory alloy, but these materials cannot satisfactorily solve the problem of immunity and biomechanical compatibility. For ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a colored titanium dioxide film on the surface of a porous NiTi alloy at low temperature, which solves the problem of suppressing the dissolution of Ni ions from the porous NiTi alloy without deteriorating the intrinsic thermomechanical properties of the alloy.