Preparation method of high-corrosion-resistance biodegradable magnesium alloy

A magnesium alloy, high corrosion resistance technology, applied in the field of materials, can solve problems such as poor mechanical properties, achieve good mechanical properties, avoid infection, and reduce the effect of corrosion rate

Active Publication Date: 2015-02-04
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High purification of magnesium can greatly improve its corrosion resistance and meet

Method used

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  • Preparation method of high-corrosion-resistance biodegradable magnesium alloy
  • Preparation method of high-corrosion-resistance biodegradable magnesium alloy
  • Preparation method of high-corrosion-resistance biodegradable magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare metal magnesium, metal zinc and metal silver as raw materials, the composition of all raw materials is Zn3% by weight percentage, Ag 1%, the balance is Mg and unavoidable impurities, wherein the content of unavoidable impurities≤0.2%;

[0037] in N 2 +SF 6 Under the protection of mixed gas, heat the metal magnesium to 760±5°C, after the metal magnesium melts, add metal silver and metal zinc in turn, and after all the metals are melted, stir until the mixture is uniform to obtain an alloy melt;

[0038] Lower the temperature of the alloy melt to 740±5°C, use a graphite bell jar to feed argon gas into the melt, the flow rate of argon gas per kilogram of alloy melt is 800mL / min, the feeding time is 12min, and then at 740±5°C Keep at 5°C for 10 minutes;

[0039] cooling the alloy melt after heat preservation and standing to 720±5°C, and then casting it into a mold preheated to 300±5°C to obtain an ingot;

[0040] Under the condition of graphite powder covering, h...

Embodiment 2

[0045] Prepare metal magnesium, metal zinc, metal silver and metal calcium as raw materials, and the composition of all raw materials is Zn 4%, Ag 0.39%, Ca 0.1% by weight percentage, and the balance is Mg and unavoidable impurities, wherein the content of unavoidable impurities ≤0.2%;

[0046] in N 2 +SF 6 Under the protection of mixed gas, heat the metal magnesium to 760±5°C, after the metal magnesium melts, add metal silver, metal calcium and metal zinc in turn, and after all the metals are melted, stir until the mixture is uniform to obtain an alloy melt;

[0047] Lower the temperature of the alloy melt to 740±5°C, use a graphite bell jar to feed argon gas into the melt, the flow rate of argon gas per kilogram of alloy melt is 850mL / min, and the feeding time is 12min, and then at 740±5°C Keep it warm at 5°C for 20 minutes;

[0048] cooling the alloy melt after heat preservation and standing to 720±5°C, and then casting it into a mold preheated to 300±5°C to obtain an in...

Embodiment 3

[0054] Prepare metal magnesium, metal zinc, metal silver and metal calcium as raw materials, and the composition of all raw materials is Zn 3%, Ag 0.22%, Ca 0.2% by weight percentage, and the balance is Mg and unavoidable impurities, wherein the content of unavoidable impurities ≤0.2%;

[0055] in N 2 +SF 6 Under the protection of mixed gas, heat the metal magnesium to 760±5°C, after the metal magnesium melts, add metal silver, metal calcium and metal zinc in turn, and after all the metals are melted, stir until the mixture is uniform to obtain an alloy melt;

[0056] Lower the temperature of the alloy melt to 740±5°C, and use a graphite bell jar to feed argon gas into the melt. The flow rate of argon gas per kilogram of alloy melt is 830mL / min, and the feeding time is 11min. Keep it warm at 5°C for 15 minutes;

[0057] cooling the alloy melt after heat preservation and standing to 720±5°C, and then casting it into a mold preheated to 300±5°C to obtain an ingot;

[0058] U...

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Abstract

The invention discloses a preparation method of a high-corrosion-resistance biodegradable magnesium alloy and belongs to the technical field of materials. The preparation method comprises the following steps: (1) preparing metallic magnesium, metallic zinc, metallic silver and metallic calcium as raw materials; (2) heating metallic magnesium to 760+/-5 DEG C under the protection of N2 and SF6 mixed gas, melting, then sequentially adding metallic silver, metallic calcium and metallic zinc, stirring and uniformly mixing; (3) cooling to 740+/-5 DEG C, introducing argon, and preserving heat and standing at 740+/-5 DEG C for 10-20 minutes; (4) cooling to 720+/-5 DEG C and casting; (5) heating to 300-320 DEG C and preserving the heat for 2-4 hours under the coverage of graphite powder, increasing the temperature to 350-450 DEG C, preserving heat for 8-12 hours, and cooling by water; (6) preserving the heat at 250-350 DEG C for 25-35 minutes, and then carrying out high-temperature plastic deformation; and (7) deforming at normal temperature and intermediately annealing for a plurality of times, and finally cooling by air to normal temperature. According to the method, by virtue of the single-phase fine-grain treatment, the magnesium alloy has high corrosion resistance and good mechanical property; the magnesium alloy can be used for manufacturing different implantable devices.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a preparation method of a biodegradable magnesium alloy with high corrosion resistance. Background technique [0002] Due to their good biocompatibility and degradability, magnesium and magnesium alloys have attracted widespread attention as implantable devices such as degradable bone repair materials, bone nails and plates, sutures, and cardiovascular stents. [0003] At present, magnesium alloys that have been commercially used are used as implant materials to carry out biomedical research, such as AZ series and Mg-RE series; because the above-mentioned alloys usually use the strengthening effect of the second phase to improve their mechanical properties , At the same time, its corrosion resistance is greatly reduced, and the corrosion is very uneven, which limits its application as an implant material; in recent years, magnesium alloys for biological applications have also b...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/02C22F1/06
CPCC22C1/02C22C23/04C22F1/06
Inventor 秦高梧王利卿肖驰王欢任玉平李松左良
Owner NORTHEASTERN UNIV
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