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

A magnesium alloy and deformed magnesium alloy technology, applied in the field of biomedical metal materials, can solve the problems of unsatisfactory mechanical properties, accelerated corrosion rate, poor corrosion resistance, etc., and achieves adjustable degradation rate and mechanical properties. Granular tissue, the effect of improving corrosion resistance

Active Publication Date: 2018-07-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloys also have some defects, which limit their applications as medical materials.
One of the key factors limiting the use of magnesium alloys is poor corrosion resistance, especially in the presence of Cl - In the medium of ions, the corrosion rate will be accelerated
As an implant material, too fast corrosion of magnesium alloy will lead to a large rate of hydrogen evolution, rapid rise of the pH value of the internal environment and abnormal reactions, and will also lead to a decline in mechanical properties that cannot meet the requirements for mechanical properties of orthopedic implants.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of Cast Mg-4.0wt%Sn-0.2wt%Mn-0.2wt%Zn Magnesium Alloy

[0031] 1) Raw material preparation: The test raw materials are pure magnesium (99.9wt.%), pure zinc (99.99wt.%) (calculated based on 10% burning loss), pure tin (99.99wt.%) and Mg-7.4wt.% Mn master alloy (calculated on the basis of 30% burning loss), and the raw material is polished with a grinding wheel to remove surface oxides.

[0032] 2) Smelting: In order to prevent the oxidation or combustion of the magnesium alloy melt, N is continuously fed throughout the smelting process 2 +SF 6 The mixed protective gas, where, N 2 and SF 6 The flow ratio is 100:1;

[0033] a) Dry the crucible, slag removal tool, stirring rod and mold in an oven at 200°C for use;

[0034] b) Put the treated crucible into a resistance furnace, set the temperature to 300°C, and when the furnace temperature reaches, pass in protective gas;

[0035] c) After feeding the protective gas for 5-8 minutes, add the polished high-pu...

Embodiment 2

[0042] Preparation of Cast Mg-3.0wt%Sn-0.01wt%Mn-0.5wt%Zn Magnesium Alloy

[0043] 1) Raw material preparation: The test raw materials are pure magnesium (99.9wt.%), pure zinc (99.99wt.%) (calculated based on 10% burning loss), pure tin (99.99wt.%) and Mg-7.4wt.% Mn master alloy, and the raw material is ground with a grinding wheel to remove surface oxides.

[0044] 2) Smelting: In order to prevent the oxidation or combustion of the magnesium alloy melt, N is continuously fed throughout the smelting process 2 +SF 6 The mixed protective gas, where, N 2 and SF 6 The flow ratio is 100:1;

[0045] a) Dry the crucible, slag removal tool, stirring rod and mold in an oven at 200°C for use;

[0046] b) Put the treated crucible into a resistance furnace, set the temperature to 300°C, and when the furnace temperature reaches, pass in protective gas;

[0047] c) After feeding the protective gas for 5-8 minutes, add the polished high-purity magnesium ingot, and at the same time, the...

Embodiment 3

[0054] Preparation of Cast Mg-1.0wt%Sn-1wt%Mn-0.05wt%Zn Magnesium Alloy

[0055] 1) Raw material preparation: The test raw materials are 820g of pure magnesium (99.9wt.%), 10.9g of pure zinc (99.99wt.%) (calculated according to 10% burning loss), 0.54g of pure tin (99.99wt.%) (according to 30% burning loss calculation) and Mg-7.4wt.%Mn master alloy 174.9g (calculation is based on 30% burning loss), and the raw material is polished with a grinding wheel to remove surface oxides.

[0056] 2) Smelting: In order to prevent the oxidation or combustion of the magnesium alloy melt, N is continuously fed throughout the smelting process 2 +SF 6 The mixed protective gas, where, N 2 and SF 6 The flow ratio is 100:1;

[0057] a) Dry the crucible, slag removal tool, stirring rod and mold in an oven at 200°C for use;

[0058] b) Put the treated crucible into a resistance furnace, set the temperature to 300°C, and when the furnace temperature reaches, pass in protective gas;

[0059] c...

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Abstract

The invention discloses a corrosion-resistant medical wrought magnesium alloy, and belongs to the field of biomedical metal materials. The corrosion-resistant medical wrought magnesium alloy comprises, by mass, 1 to 4% of Sn, 0.01 to 1% of Mn, 0.05 to 1% of Zn, and the balance Mg. The invention also discloses a method used for preparing the corrosion-resistant medical wrought magnesium alloy. The preparation method comprises following steps: raw materials are weighed at the above ratio, are subjected to polishing, and are delivered into a high purity graphite crucible; a mixed gas of SF6 and N2 is taken as a protective gas, and alloy smelting is carried out in a well-type resistance furnace; an obtained melt is stirred, is allowed to stand, and is subjected to casting so as to obtain a cast ingot; and extrusion alloy rods with excellent performance are obtained via extrusion. According to the preparation method, microalloying is adopted to prepare the rare earth element-free corrosion-resistant medical magnesium alloy, the rare earth element-free corrosion-resistant medical magnesium alloy possesses excellent biocompatibility and mechanical properties, and a problem that degradation rate of medical magnesium alloy in application process is too high is solved.

Description

Technical field: [0001] The invention belongs to the field of biomedical metal materials, and in particular relates to a Mg-Zn-Mn-Sn series biomedical deformed magnesium alloy and a preparation method thereof. Background technique [0002] Biomedical materials are a class of high-tech new materials used to diagnose, treat, repair or replace human tissues or organs or enhance their functions. With the acceleration of the aging population in China, the increase of trauma among middle-aged and young people, the injection of high technology, and the increasing attention of people to their own health along with economic development, the biomedical material industry will develop rapidly. At present, biomedical materials that have been applied in clinic mainly include: medical metal materials, medical polymer materials, medical ceramic materials, and biomedical composite materials prepared from the above-mentioned materials. Among the above-mentioned several medical materials, med...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06A61L27/04A61L27/50A61L31/02A61L31/14
CPCA61L27/047A61L27/50A61L31/022A61L31/14C22C1/03C22C23/00C22F1/06
Inventor 刘轲马可杜文博王朝辉李淑波
Owner BEIJING UNIV OF TECH
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