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Medical biodegradable zinc alloy material and preparation method thereof

A zinc alloy and bio-zinc technology, applied in the field of biodegradable implant materials, can solve the problems of low strength, poor plasticity, and single molding shape of biodegradable metal materials for biodegradable medical zinc alloys.

Inactive Publication Date: 2021-12-31
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still shortcomings in the shape of biodegradable metal materials, and the incompatibility between degradation rate and mechanical properties.
[0005] Chinese patent 2019110996172 "A Degradable Medical Zn Alloy Material and Its Preparation Method" is the applicant's previous invention patent, composed of Zn, Sn, Mg, Cu, Ag, Zr, Ca, Sr, Gd, Nd, Y and Mn Zn alloy system, the degradable medical zinc alloy prepared by this patented technology still has the disadvantages of relatively low strength and poor plasticity

Method used

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  • Medical biodegradable zinc alloy material and preparation method thereof
  • Medical biodegradable zinc alloy material and preparation method thereof
  • Medical biodegradable zinc alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the Zn-2Cu-0.8 Li (mass fraction) alloy composition distribution, that is, the mass percentages are Zn 97.2%, Cu 2%, Li 0.8%.

[0027] When smelting, first add pure Zn into a clean graphite crucible and put it into the hearth of a power frequency induction furnace. NaCl:NaF:KF=1:5:4 mixture, heat up to 650°C, stir the molten metal after Cu is completely melted; cool down to 580°C, use a bell jar to press pure Li sealed with copper foil into the liquid metal Inside, the bell jar is rotated at the same time to stir the molten metal; after the Li is completely melted, the temperature drops to 550°C, and the crucible is taken out from the furnace for 3 to 5 minutes to remove the slag. pouring into a metal mold whose mold temperature is room temperature to prepare the as-cast Zn alloy.

[0028] The tensile strength of the as-cast alloy at room temperature is 380 MPa, and the elongation is 2.34%. In 3.5% (mass percentage) NaCl solution, the self-corrosion potent...

Embodiment 2

[0031] The as-cast Zn alloy was prepared by adopting the same alloy composition and steps as in Example 1, and then the obtained as-cast Zn alloy was kept at 320° C. for 6 hours for solid solution treatment and water-cooled.

[0032] The tensile strength of the alloy at room temperature is 445 MPa, and the elongation is 11.32%. In 3.5% (mass percentage) NaCl solution, the self-corrosion potential is -1.274V, and the self-corrosion current is 20.606×10 -6 A / cm 2 .

Embodiment 3

[0034] The as-cast Zn alloy was prepared by adopting the same alloy composition and steps as in Example 1, and then the obtained as-cast Zn alloy was kept at 280° C. for 12 hours for aging treatment, and air-cooled.

[0035] The tensile strength of the alloy at room temperature is 340 MPa, the elongation is 13.16%, in 3.5% (mass percentage) NaCl solution, the self-corrosion potential is -1.289V, and the self-corrosion current is 15.382×10 -6 A / cm 2 .

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Abstract

The invention relates to a medical biodegradable zinc alloy material and a preparation method thereof. A Zn alloy system is formed by Zn, Cu and Li, and the medical biodegradable zinc alloy material comprises the following components in percentage by mass: 1-4% of Cu, 0.2-0.8% of Li and the balance of Zn. After solid solution treatment at the temperature of 300 DEG C and heat preservation for 6 hours, the tensile strength is 343 MPa, and the ductility is up to 24.2%. The self-corrosion potential is -1.29 V, and the self-corrosion current density is 19.769*10<-6> A / cm<2>. According to the prepared zinc alloy, introduction of unfavorable elements is avoided, the zinc alloy has good mechanical performance and appropriate degradation rate, and the requirements of implants for corrosion performance and mechanical performance of biodegradable zinc alloy materials can be met.

Description

technical field [0001] The invention relates to a medical alloy and a preparation method thereof, in particular to an alloy used in the field of biodegradable implant materials and a preparation method thereof. Background technique [0002] In biomedical metal materials, in addition to Fe-based alloys and titanium alloys currently used clinically, Mg alloys have good mechanical properties, biocompatibility and in vivo degradability of biomaterials due to their excellent comprehensive properties. , which is expected to be a biological candidate material for implants such as bones, vascular stents, and dental implants. [0003] However, the bio-Mg alloy has a fast degradation rate, and before it realizes its biological function, the Mg alloy implant has degraded and loses its supporting effect; while the bio-Fe-based alloy is an inert material, which hardly degrades in the body, and requires a second operation to remove it. The removal of the implant increases the pain and fi...

Claims

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Application Information

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IPC IPC(8): C22C18/02C22F1/16A61L31/02A61L31/14C22C1/02
CPCC22C18/02C22C1/02C22F1/165A61L31/022A61L31/14
Inventor 王红星张炎吴灿辉李雨韩程澄卞连森赵崔贵许殷泽周一文程军权
Owner NANJING INST OF TECH
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