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Biomedical Mg-Sn-Zn-Mn magnesium alloy and preparation method thereof

A biomedical and magnesium alloy technology, applied in the field of alloys, can solve the problems of long-term experimental observation and unclear biological effects, etc., and achieve good comprehensive mechanical properties, reduce stacking fault energy, and improve toughness.

Active Publication Date: 2012-05-02
JIANGYIN BIODEGRADE MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, Al may cause some degenerative neurological diseases such as dialysis encephalopathy syndrome and senile dementia, and it is considered as a non-essential low-toxic trace element; data in the literature shows that when the Zn content is greater than 1%, the hemolysis rate is often Therefore, it is not suitable to be used as a biological implant material in direct contact with blood; lead (Pb) is a heavy metal element with neurotoxicity, which has no physiological function in the body, and its ideal concentration in blood should be zero; although Rare earth elements such as neodymium and yttrium can improve the strength and corrosion resistance of magnesium alloys, but their biological effects are still unclear, so their safety needs to be observed in long-term experiments

Method used

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  • Biomedical Mg-Sn-Zn-Mn magnesium alloy and preparation method thereof
  • Biomedical Mg-Sn-Zn-Mn magnesium alloy and preparation method thereof
  • Biomedical Mg-Sn-Zn-Mn magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Use pure magnesium ingots (purity not less than 99.96%), pure tin ingots (purity not less than 99.95%), pure zinc ingots (purity not less than 99.95%) and Mg-6.8% Mn master alloy, according to Mg-3Sn-1Zn-0.5 Mn alloy composition (nominal composition: Sn 3%, Zn 1%, Mn 0.5%, impurity elements Fe6 / CO 2 Under the protection of mixed gas, it is poured into the metal mold for gravity casting. Before the solution heat treatment, the above-mentioned Mg-3Sn-1Zn-0.5Mn alloy ingot is pre-deformed. The pre-deformation process is to put the above alloy ingot into the SF 6 / CO 2 Extrusion is performed after homogenization heat treatment (homogenization temperature is 300° C., holding time is 5 hours) in a heat treatment furnace mixed with protective gas, and the extrusion deformation is 10%. Finally, the pre-deformed alloy is subjected to solution heat treatment (solution treatment temperature is 450° C., holding time is 24 hours, furnace cooling). The tensile strength of the al...

Embodiment 2

[0038] Use pure magnesium ingots (purity not less than 99.96%), pure tin ingots (purity not less than 99.95%), pure zinc ingots (purity not less than 99.95%) and Mg-6.8% Mn master alloy, according to Mg-3Sn-1Zn-1Mn Alloy composition (nominal composition: Sn 3%, Zn 1%, Mn 1%, impurity elements Fe6 / CO 2 Under the protection of mixed gas, it is poured into the metal mold for gravity casting. Before the solution heat treatment, the above-mentioned Mg-3Sn-1Zn-1Mn alloy ingot is pre-deformed. The pre-deformation process is to put the above alloy ingot into the SF 6 / CO 2 Extrusion is performed after homogenization heat treatment (homogenization temperature is 300° C., holding time is 5 hours) in a heat treatment furnace mixed with protective gas, and the extrusion deformation is 5%. Finally, the pre-deformed alloy is subjected to solution heat treatment (solution treatment temperature is 410° C., holding time is 28 hours, air cooling). The tensile strength of the alloy at room ...

Embodiment 3

[0040] Using pure magnesium ingots (purity not less than 99.96%), pure tin ingots (purity not less than 99.95%), pure zinc ingots (purity not less than 99.95%) and Mg-6.8% Mn master alloy, according to Mg-3Sn-0.5Zn- 0.15Mn alloy composition (nominal composition: Sn 3%, Zn0.5%, Mn 0.15%, impurity elements Fe6 / CO 2 Under the protection of mixed gas, it is poured into the metal mold for gravity casting. Before the solution heat treatment, the above-mentioned Mg-3Sn-0.5Zn-0.15Mn alloy ingot is pre-deformed. The pre-deformation process is to put the above alloy ingot into the SF 6 / CO 2 Carry out homogenization heat treatment (homogenization temperature is 400 DEG C, holding time is 3 hours) in the heat treatment furnace of mixing shielding gas and then carry out rolling, rolling deformation amount is 10%. Finally, the pre-deformed alloy is subjected to solution heat treatment (solution treatment temperature is 450° C., holding time is 12 hours, air cooling). The tensile stren...

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Abstract

The invention provides a biomedical Mg-Sn-Zn-Mn magnesium alloy and a preparation method thereof. The preparation method comprises the following steps: (1) smelting and casting pure magnesium ingots, pure tin ingots, pure zinc ingots and an Mg-Mn intermediate alloy under the protection of a fusing agent to prepare Mg-Sn-Zn-Mn magnesium alloy ingots; (2) keeping the temperature of the Mg-Sn-Zn-Mn magnesium alloy ingots at 300-400 DEG C for 3-5 hours, and extruding or rolling for predeformation; and (3) performing solution heat treatment to the predeformed Mg-Sn-Zn-Mn magnesium alloy at 400-450 DEG C for 12-28 hours, and performing water quenching, furnace cooling or air cooling to the room temperature. The microstructural characteristic of the prepared alloy is that single phase-Mg grains contain a lot of tiny growth twins; and owning to the presences of the growth twins in the grains, the obdurability of the alloy is effectively increased, the tensile strength is up to 195-238MPa, the elongation rate is up to 23-30% and the hemolysis rate is up to 4.68-7.58%. Therefore, the alloy has the advantages of no toxicity, complete degradability and high obdurability, and can be used as orthopedic internal fixation and implantation materials such as intravascular stents, bone screws and bone plates.

Description

technical field [0001] The invention relates to an alloy, and the invention also relates to a preparation method of the alloy. In particular, an alloy used in the field of biomedical materials and a preparation method thereof. Background technique [0002] At present, most biodegradable biomedical materials are polymer materials such as polylactic acid (PLA) and polyglycolic acid (PGA), but they have problems such as low mechanical properties, difficult processing, and degradation products in the body that easily cause inflammation and swelling. Degradable magnesium alloys have good comprehensive mechanical properties and machining properties. For example, extruded AZ31 magnesium alloy has high strength, which can meet the requirements of biomedical materials for mechanical properties. Moreover, the elastic modulus of magnesium alloy is about 40GPa, which is very close to bone tissue, which can effectively reduce the "stress shielding" effect. Magnesium ions (Mg 2+ ) is t...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06A61L27/04
Inventor 李新林李莉杨宝林侯理达郑玉峰王香王春鹤
Owner JIANGYIN BIODEGRADE MEDICAL TECH CO LTD
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