Laser treatment method for improving biocompatibility of magnesium alloy

A biocompatible, laser processing technology, applied in the field of material surface processing, can solve the problems of pH rise, fast corrosion rate, patient alkali poisoning, etc., achieve fast processing speed, improve production efficiency, thermal damage and thermal impact small area effect

Inactive Publication Date: 2018-11-06
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest disadvantage of magnesium alloys is that the corrosion rate is too fast. If the hydrogen gas generated during the corrosion process cannot be absorbed by the human body in time, local air pockets will form.
In addition, the pH value of the surrounding environment increases during the magnesium corrosion process, resulting in an increase in alkalinity, which not only affects the balance of physiological reactions near the magnesium implant, but may even lead to alkalosis in patients

Method used

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  • Laser treatment method for improving biocompatibility of magnesium alloy
  • Laser treatment method for improving biocompatibility of magnesium alloy
  • Laser treatment method for improving biocompatibility of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Step 1: Grinding and polishing the Mg-6Gd-0.6Ca magnesium alloy sample to 1000 mesh, ultrasonic cleaning with alcohol for 5 minutes, and drying;

[0032] (2) Step 2, place the magnesium alloy sample under a continuous laser with a wavelength of 1060nm, set the laser processing parameters as follows: power 80W, scanning speed 100mm / s, spot overlap rate 40%, start the equipment, perform laser remelting, remelting During the process, argon protection is used to obtain a remelted layer on the surface of the magnesium alloy sample;

[0033] (3) Step 3, place the magnesium alloy sample after surface remelting under a femtosecond laser (wavelength 1064nm), and perform laser texture treatment on the surface of the magnesium alloy after laser remelting treatment, and the laser processing parameters are set to: power 8W, pulse width 500fs, frequency 400kHz, scan speed 800mm / s, scan interval 70μm, scan 5 times, and obtain LIPSS structure on the surface of magnesium alloy;

[...

Embodiment 2

[0036] (1) Step 1: Grinding and polishing the AZ31 magnesium alloy sample to 1000 mesh, ultrasonic cleaning with alcohol for 5 minutes, and drying;

[0037] (2) Step 2, place the magnesium alloy sample under a continuous laser with a wavelength of 1060nm, set the laser processing parameters as follows: power 200W, scanning speed 300mm / s, spot overlap rate 20%, start the equipment, perform laser remelting, remelting During the process, argon protection is used to obtain a remelted layer on the surface of the magnesium alloy sample;

[0038] (3) Step 3, place the magnesium alloy sample after surface remelting under a femtosecond laser (wavelength 1064nm), and perform laser texture treatment on the surface of the magnesium alloy after laser remelting treatment, and the laser processing parameters are set to: power 20W, pulse width 500fs, frequency 400kHz, scan speed 800mm / s, scan interval 70μm, scan 5 times, and obtain microcone structure on the surface of magnesium alloy;

[00...

Embodiment 3

[0041] (1) Step 1: Grinding and polishing the Mg-3Sn-0.5Mn magnesium alloy sample to 1000 mesh, ultrasonic cleaning with alcohol for 5 minutes, and drying;

[0042] (2) Step 2, place the titanium alloy sample under a continuous laser with a wavelength of 1060nm, set the laser processing parameters as follows: power 200W, scan speed 70mm / s, spot overlap rate 70%, start the equipment, carry out laser remelting, remelting During the process, argon protection is used to obtain a remelted layer on the surface of the titanium alloy sample;

[0043] (3) In step 3, the magnesium alloy sample after surface remelting is placed under a picosecond laser (wavelength 1064nm), and the laser texture treatment is performed on the surface of the magnesium alloy after laser remelting treatment. The laser processing parameters are set to: power 7W, pulse width 10ps, frequency 1MHz, scan speed 2000mm / s, scan interval 20μm, scan 10 times, and obtain irregular structure on the surface of magnesium a...

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Abstract

The invention discloses a laser treatment method for improving biocompatibility of magnesium alloy. According to the method, the surface corrosion resistance of a magnesium alloy implant is improved through a laser remelting process, so that the hydrogen generation rate of the implant in the corrosion process is within the human absorbable range. Meanwhile, due to improvement of the corrosion resistance, the pH value of the surrounding environment of the implant is relatively stable and acid alkali balance of an organism near the implant is maintained. A micro-nano structure is manufactured onthe remolten surface by utilizing superfast laser, the natural environment of cell growth is simulated and the in-vivo rejection reaction of the implant is reduced. The method is flexible in processing and high in processing speed; through compounding of laser remelting and laser texturing processes, various accurate micro-structures can be obtained on the surface of the remolten layer while thesurface corrosion resistance of the magnesium alloy is improved, cell growth is controlled, the biocompatibility of the magnesium alloy implant is improved and the prospective design function of the implant is achieved.

Description

technical field [0001] The invention relates to a laser treatment method for improving the biocompatibility of magnesium alloys, belonging to the technical field of material surface processing. Background technique [0002] Magnesium alloy has the characteristics of excellent comprehensive mechanical properties, safety, non-toxicity, and degradable absorbability, and is expected to become an ideal new biodegradable biomedical metal material. However, the biggest disadvantage of magnesium alloys is that the corrosion rate is too fast, and if the hydrogen gas produced during the corrosion process cannot be absorbed by the human body in time, local air pockets will form. In addition, the pH value of the surrounding environment increases during the process of magnesium corrosion, resulting in an increase in alkalinity, which not only affects the balance of physiological reactions near the magnesium implant, but may even lead to alkalosis in patients. Therefore, controlling the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00
CPCC22F3/00
Inventor 管迎春张佳茹
Owner BEIHANG UNIV
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