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Degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and preparation method thereof

A biomedical, magnesium alloy technology, applied in medical science, tissue regeneration, prosthesis, etc., to achieve the effect of reducing galvanic corrosion, reducing corrosion rate, and increasing nucleation rate

Pending Publication Date: 2021-03-12
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Al can significantly improve the mechanical properties of magnesium alloys, Al elements are neurotoxic and can cause Alzheimer's. Rare earth elements Ce, La and some other heavy metals have a great impact on cytotoxicity, so these elements are not considered

Method used

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  • Degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and preparation method thereof
  • Degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and preparation method thereof
  • Degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and preparation method thereof

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preparation example Construction

[0054] Step 2 Preparation of Extruded Alloy Specimen

[0055] a. Cut the cast alloy blank into a cylinder with a wire cutting machine, and polish it with a grinder;

[0056] b. Put the cleaned blank into the holding furnace, and place it in the alumina powder at 350-450°C for homogenization annealing for 24 hours;

[0057] c. Polish the oxide layer of the annealed blank again;

[0058] d. Put the billet into the mold coated with lubricant, and adjust the temperature to 400°C for preheating;

[0059] e. After the temperature reaches 400°C, keep it warm for 20 minutes and carry out extrusion. The extrusion ratio is 11~30, and the extrusion speed is 1~4m / min. During the extrusion process, the temperatures of the extrusion cylinder, gasket, mold, and billet are respectively 250°C, 300°C, 350°C, 400°C;

[0060] f. After the extrusion is finished, water-cool the extruded bar.

Embodiment 1

[0062] The composition (mass percentage) of the alloy is: 1.0%Nd, 0.5%Zn, 2.0%Sc, and the remaining elements are Mg. The preparation process of the alloy is as follows: put the steel crucible into a resistance furnace to preheat to 400°C for 10 minutes, and then pass in a mixed gas of carbon dioxide and sulfur hexafluoride, wherein the volume ratio of carbon dioxide and sulfur hexafluoride is 97:3 , add 486.20g of high-purity magnesium ingot, cover the furnace cover, and raise the temperature to 720°C; after the furnace charge is completely melted, add 40.33g of dried Mg-30Sc master alloy to the crucible; after 10min, raise the temperature to 800°C, start Timing heat preservation, the heat preservation time is 90min. After the heat preservation is over, add 20.17g of dried Mg-30Nd master alloy, and lower the temperature to 720°C at the same time. After 15 minutes, add 3.3g of dried high-purity zinc ingot, and wait until the melt is completely melted and heat for 10 minutes. , ...

Embodiment 2

[0064] The composition (mass percentage) of gold is: 3.0%Nd, 0.5%Zn, 4.0%Sc, and the remaining elements are Mg. The preparation process of the alloy is as follows: put the steel crucible into a resistance furnace to preheat to 400°C for 10 minutes, and then pass in a mixed gas of carbon dioxide and sulfur hexafluoride, wherein the volume ratio of carbon dioxide and sulfur hexafluoride is 97:3 , add 405.53g of high-purity magnesium ingot, cover the furnace cover, and raise the temperature to 720°C; after the furnace charge is completely melted, add 80.67g of dried Mg-30Sc master alloy into the crucible; after 10min, raise the temperature to 800°C, start Timing heat preservation, the heat preservation time is 90min, after the heat preservation is over, add 60.50g of dried Mg-30Nd master alloy, and lower the temperature to 720°C at the same time, add 3.3g of dried high-purity zinc ingot after 15min, wait until the melt is completely melted and heat for 10min , poured into a metal...

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Abstract

The invention discloses a degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and a preparation method thereof. The degradable Mg-Nd-Zn-Sc biomedical magnesium alloy comprises the following chemical components in percentage by mass: 1.0-3.0% of Nd, 0.3-0.7% of Zn, 2.0-8.0% of Sc and the balance of Mg and inevitable impurity elements. Through extrusion processing at 350-450 DEG C and with the extrusion ratio of 11-30, the Zn content in the alloy is low, the potential of Nd is close to that of Mg, the solid solubility of Sc in a magnesium matrix is high, the added Sc can be completely subjected tosolid solution, the mechanical property of the alloy can be improved through second-phase strengthening and solid solution strengthening, severe galvanic corrosion cannot be caused, In addition, scandium oxide formed during corrosion of Sc and original loose magnesium hydroxide form a compact passivation layer together, so that the base body is protected against corrosion to a certain extent.

Description

technical field [0001] The invention is mainly applied in the field of biomedical materials, belongs to the field of design and manufacture of metal materials, and specifically relates to a degradable Mg-Nd-Zn-Sc biomedical magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys are widely considered as candidates for biodegradable bone implants due to their excellent biocompatibility and excellent osteogenic capacity, and are also considered to have great potential as vascular scaffold materials due to their biodegradable properties . In addition, the Young's modulus (41–45 GPa) of magnesium alloys is similar to that of human bone (20 GPa), so it can avoid the "stress shielding effect" to promote bone growth, compared with about 200 GPa for stainless steel and about 100 GPa for titanium alloys. In addition, due to the good biodegradability of magnesium alloys, compared with stainless steel and titanium alloys, it avoids the pain and...

Claims

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Application Information

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IPC IPC(8): A61L27/04A61L27/50A61L27/58A61L31/02A61L31/14C22C23/06C22F1/06B21C23/02B21C37/04C22C1/03
CPCC22C23/06C22C1/03C22F1/06B21C37/04B21C23/02A61L27/047A61L27/58A61L27/50A61L31/022A61L31/148A61L31/14A61L2430/02
Inventor 朱世杰白明云关绍康王瑞罡辛丽娜张亚博王利国王俊
Owner ZHENGZHOU UNIV
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