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A kind of bio-magnesium alloy of lpso structure with high volume fraction and preparation method thereof

A technology with high volume fraction and volume fraction, used in prosthesis, medical science, etc., can solve the problems of excessive degradation rate and uneven degradation, and achieve the effect of increasing the degradation rate, weakening the corrosion potential difference, and avoiding premature failure.

Inactive Publication Date: 2016-03-23
江苏凯晞投资有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a Mg-Gd-Zn-Zr bio-magnesium alloy material with a high volume fraction LPSO structure and a preparation method thereof in view of the problem that the degradation rate of the current bio-magnesium alloy is too fast and the degradation is uneven

Method used

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  • A kind of bio-magnesium alloy of lpso structure with high volume fraction and preparation method thereof
  • A kind of bio-magnesium alloy of lpso structure with high volume fraction and preparation method thereof
  • A kind of bio-magnesium alloy of lpso structure with high volume fraction and preparation method thereof

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preparation example Construction

[0044] The preparation method of the biological magnesium alloy with high volume fraction LPSO structure of the present invention comprises the following steps in sequence:

[0045] (1) Melting:

[0046] Put the high-purity magnesium with a purity greater than 99.95%, the Mg-Gd master alloy, the pure zinc and the Mg-Zr master alloy with a purity greater than 99.99% into a crucible with a protective gas according to the ratio, and pour it into the preheated Mg-Gd-Zn-Zr magnesium alloy ingots are formed in steel molds at a temperature of 150-200 °C;

[0047] (2) cooling:

[0048] keeping the Mg-Gd-Zn-Zr magnesium alloy ingot obtained in step (1) at 340-460° C. for 1-6 hours, and then water-cooling;

[0049] (3) Heat treatment:

[0050] Put the ingot into a resistance furnace with a protective atmosphere to heat and keep it warm to obtain magnesium alloy structures with different volume fractions of LPSO structure.

Embodiment 1

[0053] High-purity magnesium (Mg purity greater than or equal to 99.95%), Mg-Gd master alloy (Fe, Ni, Cu and other impurities less than 0.05%), pure zinc (Zn purity greater than or equal to 99.99%) and Mg-Zr master alloy ( Fe, Ni, Cu and other impurities are less than 0.01%), and smelted according to the alloy composition ratio of Mg-4.8Gd-0.8Zn-0.5Zr (mass fraction). When smelting, put high-purity magnesium into the crucible to heat, and the furnace temperature rises to 300°C and starts to introduce CO 2 and SF 6 The mixed gas is used as a protective gas, and the flow ratio of the mixed gas is selected as 97:3. When the temperature rises to 740°C, the Mg-Gd master alloy is added. After it is completely melted, pure Zn and Mg-Zr master alloys are added. When the raw materials are completely melted Finally, turn on the automatic stirrer and stir for 4-8 minutes. In this embodiment, stir for 5 minutes, then set the temperature to 720°C and let it stand for 10 minutes. In the m...

Embodiment 2

[0055] High-purity magnesium (Mg purity greater than or equal to 99.95%), Mg-Gd master alloy (Fe, Ni, Cu and other impurities less than 0.05%), pure zinc (Zn purity greater than or equal to 99.99%) and Mg-Zr master alloy ( Fe, Ni, Cu and other impurities are less than 0.01%), and smelted according to the alloy composition ratio of Mg-4.8Gd-0.8Zn-0.5Zr (mass fraction). When smelting, put high-purity magnesium into the crucible to heat, and the furnace temperature rises to 300°C and starts to introduce CO 2 and SF 6 The mixed gas is used as a protective gas, and the flow ratio of the mixed gas is selected as 97:3. When the temperature rises to 740°C, the Mg-Gd master alloy is added. After it is completely melted, pure Zn and Mg-Zr master alloys are added. When the raw materials are completely melted Finally, turn on the automatic stirrer and stir for 4-8 minutes. In this embodiment, stir for 5 minutes, then set the temperature to 720°C and let it stand for 10 minutes. In the m...

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Abstract

The invention relates to high-volume-fraction biological magnesium alloy of an LPSO structure and a preparation method. The biological magnesium alloy comprises the following components by mass percent: 3.6 to 4.9 percent of Gd, 0.6 to 0.9 percent of Zn, 0.3 to 0.6 percent of Zr and the balance of Mg and inevitable impurities. The preparation method comprises the steps: placing the well-prepared raw materials into a crucible with protection gas to be smelted and cast to form cast ingot, placing the cast ingot after being solidified into the water to be rapidly cooled, and then placing the cast ingot into a resistance furnace with a protection atmosphere to be thermally treated, wherein the thermal treatment temperature is 340 to 460 DEG C, and the heat preserving time is 1h to 6h. The magnesium alloy has the LPSO structure with the volume fraction being greater than 30 percent, the alloy of the structure is excellent in degradability, and the problems of the biologically degradable magnesium alloy in a human body environment that the degradation speed is high and the degradation is non-uniform can be effectively solved; moreover, the alloy is toxicity-free to the cells and expected to be applied to the biomedicine field.

Description

technical field [0001] The invention relates to a biomedical magnesium alloy and a preparation method thereof, in particular to a magnesium alloy with a high volume fraction LPSO structure used in the field of biodegradable implant materials and a preparation method thereof. Background technique [0002] Due to the advantages of good biocompatibility and in vivo degradability, magnesium alloy has become a research hotspot in biomedical fields such as cardiovascular stents and orthopedic fixtures. However, at present, the degradation rate of most magnesium alloys in the human environment medium is too fast and shows uneven degradation. Kirkland et al. studied 31 The biocorrosion performance of magnesium alloys in different states in the simulated human environment medium, 29 of them showed uneven corrosion, which would easily lead to premature loss of support function after implantation, thus affecting the healing effect of the disease. Up to now, there is still no clinical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03A61L27/04
Inventor 章晓波巴志新方信贤王章忠王强王倩陈凤斌黄小桂
Owner 江苏凯晞投资有限公司
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