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A kind of corrosion-resistant casting magnesium alloy and preparation method thereof

A casting magnesium alloy, corrosion-resistant technology, applied in surgery, medical science and other directions, can solve the problems of restricting the in-depth promotion and application of cast magnesium alloys, difficult to adapt to the requirements of implants, and the rapid degradation rate of magnesium alloys. Avoid high energy consumption for special processing and coating, improve uniformity and density, and good biocompatibility

Active Publication Date: 2022-01-28
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid degradation rate of magnesium alloys often causes them to lose their mechanical integrity before the end of their service life
Especially for cast magnesium alloys with inhomogeneous columnar grains, the corrosion resistance will be further deteriorated
At the same time, the strength of cast magnesium alloy is low, so it is difficult to meet the requirements of implants in terms of load-bearing performance.
These shortcomings greatly limit the in-depth promotion and application of cast magnesium alloys in the field of biomedical materials

Method used

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  • A kind of corrosion-resistant casting magnesium alloy and preparation method thereof
  • A kind of corrosion-resistant casting magnesium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The corrosion-resistant cast magnesium alloy and its preparation method are specifically:

[0016] Preheat each raw material to 300 °C. When the temperature of the crucible reaches 500 °C, add uniformly preheated pure magnesium, and then raise the temperature to 750 °C. After the pure magnesium is completely melted, add a uniformly preheated Zr source and stir for 5 min for fluxing. When the furnace temperature rises to 770 ℃, add the preheated Mg-Yb alloy and stir for 5 minutes to help the melting, then set the furnace temperature to 710 ºC and keep it for 20 minutes to remove the slag, and immediately pour the molten metal into the steel water-cooled mold Cast magnesium alloys are obtained in the process, and the whole process of melting is carried out under gas protection;

[0017] The composition of the cast magnesium alloy is: Zr=1.0%, Yb=1.0%, and the rest is Mg; figure 1 As shown, its microstructure is uniform equiaxed grains, and Zr-rich particles and submicron...

Embodiment 2

[0021] A corrosion-resistant cast magnesium alloy and a preparation method thereof of the present invention, specifically:

[0022] The raw materials were preheated to 350 °C. When the crucible temperature reached 510 °C, uniformly preheated pure magnesium was added, and then the temperature was raised to 760 °C. After the pure magnesium was completely melted, a uniformly preheated Zr source was added and stirred for 6 min for fluxing. When the furnace temperature rises to 770 ℃, add the preheated Mg-Yb alloy and stir for 8 minutes to help the melting, then set the furnace temperature to 720 ºC and keep it for 25 minutes to remove the slag, and immediately pour the molten metal into the steel water-cooled mold Cast magnesium alloys are obtained in the process, and the whole process of melting is carried out under gas protection;

[0023] The composition of the cast magnesium alloy is: Zr=1.2%, Yb=1.0%, and the rest is Mg; its microstructure is uniform equiaxed grains, and Zr-r...

Embodiment 3

[0027] A corrosion-resistant cast magnesium alloy and a preparation method thereof of the present invention, specifically:

[0028] Preheat each raw material to 330 °C, add preheated pure magnesium when the temperature of the crucible reaches 520 °C, then raise the temperature to 770 °C, add preheated uniform Zr source after the pure magnesium is completely melted, and stir for 10 min to help the melting. When the furnace temperature rises to 780°C, add the preheated Mg-Yb alloy and stir for 10 minutes to boost the melting, then set the furnace temperature to 700°C and keep it for 20 minutes to remove the slag, and immediately pour the molten metal into the steel water-cooled mold To obtain cast magnesium alloy, the whole process of smelting is carried out under gas protection;

[0029] Preheat each raw material to 330°C, add evenly preheated pure magnesium when the temperature of the crucible reaches 500°C, then raise the temperature to 770°C, add evenly preheated Mg-Yb alloy...

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Abstract

The invention discloses a corrosion-resistant casting magnesium alloy and a preparation method thereof. The composition is: 1.0wt% of Yb, 1.0-1.5wt% of Zr, and the rest are Mg and unavoidable impurities. The present invention adopts Yb with larger atomic radius among heavy rare earth elements and Zr with strong supercooling ability to modify cast pure magnesium, and the addition of trace Yb ​​and Zr can equiaxally refine the as-cast grains and effectively improve its mechanical and corrosion resistance properties . Therefore, the cast magnesium alloy obtained under the combined effects of components and contents of the present invention has better strength, corrosion resistance and biocompatibility matching, and can be used as a candidate for medical implantable materials.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy preparation, in particular to a corrosion-resistant cast magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys have attracted extensive attention in the field of biomedical implantable materials because of their good biocompatibility, degradability, and similar density and elastic modulus to human bones. Studies have shown that bone plates made of magnesium alloys are not only harmless after implantation into the human body, but also can promote the growth of bone cells and accelerate the healing process. However, the rapid degradation rate of magnesium alloys often causes them to lose their mechanical integrity before the end of their service life. Especially for cast magnesium alloys with inhomogeneous columnar grains, their corrosion resistance will be further deteriorated. At the same time, the strength of cast magnesium alloy is low, so it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C23/00A61L31/02A61L31/14
CPCC22C1/03C22C23/00A61L31/022A61L31/14
Inventor 李路文镯璋刘纯荣白雪周伟蒋静雯钟惠玲
Owner SOUTHWEST UNIVERSITY
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