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Method for preparing corrosion-resistant biological magnesium alloy

A magnesium alloy and corrosion-resistant technology, which is applied in the field of biomedical material preparation, can solve the problems of bulky Mg/Al-Ca phase, corrosion of magnesium alloy substrate, and limited improvement effect, so as to promote nucleation production, improve degradation performance, The effect of promoting the refinement of grain volume

Inactive Publication Date: 2018-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the protective film can protect the magnesium alloy at the initial stage of implantation, after it falls off, the magnesium alloy substrate will still be eroded by body fluids and corrode rapidly.
In addition, some studies have used casting technology to apply calcium oxide to magnesium alloys. However, due to the long solidification time of this method, the volume of the obtained Mg / Al-Ca phase is relatively large, and strong galvanic corrosion will still occur with the matrix. Therefore, the improvement effect is very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using calcium oxide powder and AZ91 powder as raw materials, weigh 0.06g of calcium oxide powder (purity>99%, particle size ~40-60nm) and 9.94g of AZ91 powder (purity>99.9%, particle size ~70μm), placed in the ball mill, and after passing high-purity argon gas, set the rotation speed at 300rad / min, and the ball milling time was 6 hours to obtain uniformly dispersed calcium oxide / AZ91 mixed powder. Under the protection of high-purity argon gas with a purity of 99.999%, under the parameters of laser power 80W, scanning speed 200mm / min, spot diameter 80μm, scanning distance 0.1mm, powder coating thickness 0.1mm, the bio-magnesium alloy was prepared by SLM process .

[0026] Microstructural tests found that 0.6wt% CaO completely consumed the coarse Al supersaturated phase and Mg in AZ91 17 Al 12 phase, resulting in smaller and denser Mg 2 Ca phase and Al 2 Ca phase, and there is no calcium oxide residue; electrochemical tests found that the addition of calcium oxide mad...

Embodiment 2

[0028]Using calcium oxide powder and AZ91 powder as raw materials, weigh 0.1g calcium oxide powder (purity>99%, particle size ~40-60nm) and 9.9g AZ91 powder (purity>99.9%, particle size ~70μm), placed in the ball mill, and after passing high-purity argon gas, set the rotation speed at 300rad / min, and the ball milling time was 6 hours to obtain uniformly dispersed calcium oxide / AZ91 mixed powder. Under the protection of high-purity argon with a purity of 99.999%, under the parameters of laser power 80W, scanning speed 220mm / min, spot diameter 80μm, scanning distance 0.9mm, powder coating thickness 0.11mm, the bio-magnesium alloy was prepared by SLM process .

[0029] Microstructural tests found that 1.0wt% CaO completely consumed the coarse Al supersaturated phase and Mg in AZ91 17 Al 12 phase, forming a large amount of Mg 2 Ca phase and Al 2 Ca phase, and there is no calcium oxide residue; electrochemical tests found that adding 1.0wt% calcium oxide made the corrosion pote...

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Abstract

The invention discloses a method for preparing corrosion-resistant biological magnesium alloy. The method comprises the following steps: (1) putting calcium oxide powder and biological magnesium alloypowder in a specific ratio into a ball mill, and performing ball milling under protective atmosphere so as to obtain mixed powder; and (2) performing selective laser melting under protective atmosphere by taking the mixed powder as a raw material so as to prepare the corrosion-resistant biological magnesium alloy. In the preparation process, the laser power is controlled to be 60-90W, the scanning speed is controlled to be 100-500mm / min, and the spot diameter is controlled to be 40-100mu m. According to the method disclosed by the invention, calcium oxide is added to the biological magnesiumalloy through selective laser melting so as to generate an Mg / Al-Ca phase with a smaller volume; and by utilizing the characteristic of high setting rate of selective laser melting, the volume of thesecond phase of Mg / Al-Ca is refined, and simultaneously, the continuity of Mg / Al-Ca is improved, thereby coating magnesium alloy grains to form continuous second phase protection layers to prevent thecorrosion of body fluid.

Description

technical field [0001] The invention belongs to the technical field of preparation of biomedical materials, and in particular relates to a method for preparing a corrosion-resistant bio-magnesium alloy. Background technique [0002] In recent years, a new generation of medical metal materials mainly represented by biodegradable magnesium alloys is becoming a research hotspot for orthopedic implant materials. Bio-magnesium alloy has a density and elastic modulus close to that of human bone, which can effectively reduce the "stress shielding" effect. Moreover, magnesium, as an essential nutrient element for the human body, can promote new bone formation. More importantly, bio-magnesium alloys are prone to corrosion in the human environment, and can be completely degraded as implants in the body, avoiding secondary operations. However, due to the low standard potential (-2.37V), the degradation rate of bio-magnesium alloys in the human environment is too fast, and it is likel...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C23/00B22F3/105B33Y10/00B33Y70/00
CPCC22C1/058C22C23/00B33Y10/00B33Y70/00B22F10/00B22F10/366B22F10/36B22F10/28B22F10/32Y02P10/25
Inventor 高成德帅词俊
Owner CENT SOUTH UNIV
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