Method for improving binding strength of medical bio-coating on surface of medical magnesium alloy

Abstract

The invention provides a method for improving the binding strength of a medical bio-coating on a surface of a medical magnesium alloy. The method is characterized by comprising the following steps: performing acid treatment on the polished surface of a magnesium alloy part; performing surface micro-texture processing on the magnesium alloy part by using the thermal effect of an optical fiber laser to obtain a micro-groove array; performing laser impact on intervals of the micro-groove array on the magnesium alloy surface by using the power effect of ultrahigh energy density pulse laser to form a uniform and compact contracted micro-structure; finally soaking the magnetic alloy part with contracted micro-groove array on the surface in simulated body fluid (SBF), and biomimetically growing to obtain a hydroxyapatite (HA) bio-coating with high binding strength. According to the method, the bioactivity of the magnetic alloy surface can be promoted, the HA coating has a mechanical locking performance due to the special contracted surface micro-structure, so that the binding force between the implanted magnesium alloy and bone can be reinforced, the defects that a medical magnesium alloy implant body is short in service life and the HA coating easily falls off can be overcome.

Description

technical field [0001] The present invention relates to a kind of medical biotechnology, especially a kind of technology that uses laser processing to modify the surface of medical biomaterials, specifically a kind of mechanical locking structure prepared by laser thermodynamic composite process to improve the surface of medical magnesium alloy. The method for the bonding strength of the medical biological coating improves the bonding strength of the implant and the hydroxyapatite biological coating. technical background [0002] Magnesium alloy has become a new generation of metal hard tissue implant materials due to its low density, high strength, excellent processing performance, non-toxicity, elastic modulus similar to human bone, and good biocompatibility with human body. However, due to the existence of chloride ions and proteins in the human body environment, long-term service of metal materials in the body fluid environment will cause corrosion on the surface of the ...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the bonding strength between the biological coating produced on the surface of the existing magnesium alloy and the substrate is not high, and it is easy to fall off during use. It is a method to grow biological coatings by lowering large locking grooves to achieve mechanical locking and increase bonding strength. It can effectively improve the poor bonding strength between hydroxyapatite coatings and implants, uneven coating distribution, and complicated manufacturing processes. In addition, it also improves the wear resistance and corrosion resistance, biocompatibility and biological activity of magnesium alloy, and prolongs the service life

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