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Preparation method of a multi-level nano-coating on the surface of magnesium alloy with adjustable corrosion resistance

A nano-coating and magnesium alloy technology, applied in the fields of corrosion resistance regulation, surface coating design and preparation of medical magnesium alloys, can solve the problems of poor biological fusion, body toxicity, difficulty in forming three-dimensionality or step coverage, etc. achieve good coverage

Active Publication Date: 2019-10-29
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these coatings and their preparation technologies are directly applied to medical magnesium alloys, there are often problems such as difficulty in forming three-dimensionality or step coverage, poor biofusion, and certain toxicity to the body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The size of the magnesium alloy sample is 90mm×90mm×4mm, coated with single-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) nanocoating. The steps of dehydrogenation of magnesium alloy, preparation of PE-ALD working chamber, preparation of multi-level nano-coating, and reduction of PE-ALD working chamber are carried out in sequence. Single-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) In the preparation of nano-coatings, the TDEAT gas injection time was controlled to be 0.02s when the titanium nitride film was prepared, the film thickness increased by 0.05nm per cycle, and the number of cycles was 120; when the titanium dioxide film was prepared, the number of cycles was 160. Single-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) The number of nano-coating superimpositions N is 1, and the preparation of a single-stage nano-coating is completed.

[0025] The coating thickness was measured to be 14nm by atom probe characterization (AF...

Embodiment 2

[0027] Magnesium alloy sample size is 90mm×90mm×4mm, coated with double-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) nanocoating. The steps of dehydrogenation of magnesium alloy, preparation of PE-ALD working chamber, preparation of multi-level nano-coating, and reduction of PE-ALD working chamber are carried out in sequence. Single-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) In the preparation of nano-coatings, the TDEAT gas injection time was controlled to be 0.02s when the titanium nitride film was prepared, the film thickness increased by 0.05nm per cycle, and the number of cycles was 120; when the titanium dioxide film was prepared, the number of cycles was 160. Single-stage titanium nitride (TiN 2 ) / Titanium Dioxide (TiO 2 ) The number of nano-coating superimpositions N is 2, and the preparation of the two-stage nano-coating is completed.

[0028] Detected by atom probe characterization (AFM), the measured thickness of the coating is 28nm...

Embodiment 3

[0030] The size of the magnesium alloy sample is 90mm×90mm×4mm, coated with single-stage titanium nitride (TiN 0.5 ) / Titanium Dioxide (TiO 2 ) nanocoating. The steps of dehydrogenation of magnesium alloy, preparation of PE-ALD working chamber, preparation of multi-level nano-coating, and reduction of PE-ALD working chamber are carried out in sequence. Single-stage titanium nitride (TiN 0.5 ) / Titanium Dioxide (TiO 2 ) nano-coating preparation, the TDEAT gas injection time was controlled to be 1 s when the titanium nitride film was prepared, the film thickness increased by 0.08 nm per cycle, and the number of cycles was 100; when the titanium dioxide film was prepared, the number of cycles was 200. Single-stage titanium nitride (TiN 0.5 ) / Titanium Dioxide (TiO 2 ) The number of nano-coating superimpositions N is 1, and the preparation of a single-stage nano-coating is completed.

[0031] Detected by atom probe characterization (AFM), the measured coating thickness is 18nm;...

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Abstract

The invention relates to a preparation method of a magnesium alloy surface multistage nano coating controllable and adjustable in corrosion resistance. The preparation method comprises the following steps: removing hydrogen from the magnesium alloy, preparing a PE-ALD working chamber, preparing the multistage nano coating and reducing the PE-ALD working chamber, wherein the multistage nano coatingis formed from single stage nano coating by one or more times of overlaying; the overlaying times N is the number of stages; and the single stage nano coating is TiNx (X=0.5-2.0) / TiO2. According to the preparation method of the magnesium alloy surface multistage nano coating controllable and adjustable in corrosion resistance, the prepared coating has the advantages as follows: the coating with an accurate stoichiometric ratio, good coverage performance and precise thickness can be formed on arbitrarily shaped surfaces (two-dimensional or three-dimension), the corrosions resistance of the coating is controllable and adjustable, the coating materials are non-toxic and harmless to the human body, and therefore the coating can not only be used for corrosion resistance control and adjustmentof magnesium and the magnesium alloy, can but also be used for surface corrosion resistance control and adjustment of other orthopedic implant active metal materials.

Description

technical field [0001] The invention belongs to the surface modification treatment technology of magnesium alloys, and in particular relates to the design, preparation and corrosion resistance control of the surface coating of medical magnesium alloys. Background technique [0002] Skeletal injuries caused by trauma, sports, and population aging have led to an increasing demand for bone implant materials. In China, more than 1 million disabled people and 500,000 patients are caused by traffic accidents every year, requiring implantation of bone internal fixers, and the cost is estimated to exceed 100 billion U.S. dollars. At present, the metal materials of bone implants in clinical application are mainly stainless steel, titanium alloy and Co-Cr alloy. The difference between the elastic modulus of the above-mentioned materials and the bone tissue will cause stress shielding to the healing tissue and hinder the healing process; at the same time, the patient needs to undergo ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/40C23C16/34C23C16/455B82Y40/00A61L27/04A61L27/30A61L27/50
CPCA61L27/047A61L27/306A61L27/50A61L2420/02A61L2420/08A61L2430/02B82Y40/00C23C16/34C23C16/405C23C16/45536
Inventor 罗岚刘勇王立王雨郭锐
Owner NANCHANG UNIV
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