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A kind of 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, reduce corrosion rate, relieve pain and trouble.

Inactive Publication Date: 2016-04-20
NORTHEASTERN UNIV LIAONING +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 the requirements of its biomedical materials, but its mechanical properties are poor

Method used

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  • A kind of preparation method of high corrosion resistance biodegradable magnesium alloy
  • A kind of preparation method of high corrosion resistance biodegradable magnesium alloy
  • A kind of 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, Ag1%, 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, he...

Embodiment 2

[0045] Prepare metal magnesium, metal zinc, metal silver and metal calcium as raw materials. The composition of all raw materials is Zn4%, Ag0.39%, Ca0.1% by weight percentage, and the balance is Mg and unavoidable impurities, wherein the unavoidable impurities Content≤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 ingot;

[00...

Embodiment 3

[0054] Prepare metal magnesium, metal zinc, metal silver and metal calcium as raw materials. The composition of all raw materials is Zn3%, Ag0.22%, Ca0.2% by weight percentage, and the balance is Mg and unavoidable impurities, of which unavoidable impurities Content≤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] Under the condi...

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Abstract

A method for preparing a biodegradable magnesium alloy with high corrosion resistance, which belongs to the field of material technology and is carried out according to the following steps: (1) Prepare metal magnesium, metal zinc, metal silver and metal calcium as raw materials; (2) In N2+SF6 Under the protection of mixed gas, heat the metal magnesium to 760±5℃, add metal silver, metal calcium and metal zinc in sequence after melting, and stir until evenly mixed; (3) Cool down to 740±5℃, add argon gas, and heat at 740 Keep at ±5°C for 10~20min; (4) Cool to 720±5°C for casting; (5) Cover with graphite powder, heat to 300~320°C and keep for 2~4 hours, raise the temperature to 350~450°C and keep for 8~ 12h, water cooling; (6) Keep at 250~350℃ for 25~35min, and then plastically deform at high temperature; (7) Perform multiple normal temperature deformation-intermediate annealing, and finally air cool to normal temperature. The method of the present invention enables the magnesium alloy to obtain high corrosion resistance and good mechanical properties through single-phase and fine-grain treatment, and can be used for the preparation of different implanted 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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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/04C22C1/02
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 LIAONING
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