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A kind of high-strength rapidly degradable biomedical mg-zn-zr-fe alloy material and preparation method thereof

An alloy material and rapid degradation technology, applied in the field of biomedical multi-component magnesium alloys, can solve the problems of loose and shedding of magnesium alloy surface film, reduction of magnesium alloy elongation, reduced corrosion resistance of magnesium alloy, etc. The effect of segregation and strength improvement

Active Publication Date: 2020-03-17
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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Problems solved by technology

However, studies have shown that excessive Zn (over 8%) content will cause loosening and falling off of the surface film of magnesium alloys, reducing the corrosion resistance of magnesium alloys; and the elongation of magnesium alloys will also decrease with the increase of Zn content
Therefore, the application of ZK60 alloy with low plasticity and poor corrosion resistance in the field of biomedicine is limited.
[0005] On the other hand, the main problem in the application of magnesium alloy biomaterials is that the corrosion rate is too fast, especially the impurity content is one of the most important factors affecting the corrosion resistance of magnesium alloys, especially harmful elements such as Fe, Ni, Cu and Co content, the content of these harmful elements in the alloy needs to be controlled below the allowable limit (the maximum solubility of Fe, Cu and Ni in Mg is 170×10 -6 , 1000×10 -6 , 5×10 -6 ) to effectively improve the corrosion resistance of the alloy

Method used

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  • A kind of high-strength rapidly degradable biomedical mg-zn-zr-fe alloy material and preparation method thereof
  • A kind of high-strength rapidly degradable biomedical mg-zn-zr-fe alloy material and preparation method thereof

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preparation example Construction

[0034] A kind of high-strength fast degradable biomedical Mg-Zn-Zr-Fe alloy preparation method of the present invention comprises the following steps:

[0035] (1) Raw materials are weighed according to the proportion. The above-mentioned raw materials adopt high-purity magnesium ingots, high-purity zinc ingots, high-purity iron, Mg-30% Zr intermediate alloys, and the above-mentioned raw materials are smelted under the protection of argon by a vacuum induction furnace. Keep warm at ℃ for 40-60 minutes, stir for 5-10 minutes after the above raw materials are melted, then cool down to 730-750 ℃ ​​and refine for 20-30 minutes, after refining, raise the temperature to 750-780 ℃ and let stand for 30-40 minutes, then cast at 710-730 ℃ Ingot;

[0036] (2) Homogenize the above-mentioned cast ingot at 400-420°C, hold for 16-18h, and water-cool at 50-60°C;

[0037] (3) Extrude the homogenized alloy into plates, rods, and wires through an extrusion machine at an extrusion temperature of...

Embodiment 1

[0043] The mass percent of Mg-Zn-Zr-Fe alloy elements is: Zn 5.8%, Zr 0.65%, Fe 0.03%, Al 0.005%, Ni 0.004%, Cu 0.004%, and the rest is Mg.

[0044] The raw materials are: Mg ingot with a purity of 99.995%, Zn ingot with a purity of 99.993%, Fe ingot with a purity of 99.987%, and a Mg-Zr master alloy with a mass percentage of Zr of 29.8% (mass percentage of impurities is 0.004%).

[0045] Weigh the raw materials according to the ratio, melt the above raw materials through a vacuum induction furnace under the protection of argon, keep them at 800°C for 60 minutes, stir for 5 minutes after the above raw materials are melted, then cool down to 730°C and refine for 25 minutes, and then heat up to 760°C after refining. ℃ for 30 minutes, poured into ingots at 710 ℃;

[0046] Homogenize the above-mentioned ingot at 420°C, hold for 16 hours, and water-cool at 60°C;

[0047] Extrude the homogenized alloy into rods through an extruder at an extrusion temperature of 250°C and an extrusi...

Embodiment 2

[0053] The mass percent of Mg-Zn-Zr-Fe alloy elements is: Zn 5.6%, Zr 0.74%, Fe 0.05%, Al 0.004%, Ni 0.003%, Cu 0.004%, and the rest is Mg.

[0054] The raw materials are: a Mg ingot with a purity of 99.995%, a Zn ingot with a purity of 99.993%, an Fe ingot with a purity of 99.987%, and a Mg-Zr master alloy with a Zr mass percentage of 30% (mass percentage of impurities is 0.004%).

[0055] Weigh the raw materials according to the ratio, melt the above raw materials through a vacuum induction furnace under the protection of argon, keep them at 790°C for 50 minutes, stir for 10 minutes after the above raw materials are melted, then cool down to 750°C for 30 minutes, and then heat up to 780°C ℃ for 40 minutes, poured into ingots at 720 ℃;

[0056] Homogenize the above-mentioned ingot at 410°C, hold for 18 hours, and water-cool at 55°C;

[0057] Extrude the homogenized alloy into a rod through an extruder at an extrusion temperature of 280°C and an extrusion speed of 0.3mm / s, wi...

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Abstract

The invention discloses a high-strength biomedical Mg-Zn-Zr-Fe alloy material with rapid biodegradability, and a preparation method thereof. The magnesium alloy is prepared from the components in percentage by mass: 5.0 to 6.0 percent of Zn, 0.5 to 1.0 percent of Zr, 0.01 to 0.09 percent of Fe, and the balance Mg and inevitable impurities. The preparation method comprises the concrete steps of smelting, carrying out casting homogenization treatment, hot-extruding and carrying out artificial aging treatment, so that biomedical magnesium alloy sheets, rods and wires meeting the service requirement of the biological fluid environment are obtained. According to the high-strength biomedical Mg-Zn-Zr-Fe alloy material with rapid biodegradability provided by the invention, the alloy elements harmless to a human body are added into the magnesium alloy, so that the alloy has no any toxicity on the human body after being degraded in vivo, and has excellent mechanical property, favorable mechanical property and processability, and appropriate corrosion rate. The high-strength degradable biomedical Mg-Zn-Zr-Fe alloy material provided by the invention has the tensile strength being larger thanor equal to 360MPa and the yield strength being larger than or equal to 320MPa, and is suitable for preparing medical materials such as bone nails.

Description

technical field [0001] The invention belongs to the field of biomedical multi-element magnesium alloys, in particular to a bioabsorbable Mg-Zn-Zr-Fe multi-element magnesium alloy material. Background technique [0002] At present, the metal materials widely used in clinical bioimplantation mainly include stainless steel, cobalt-chromium alloy, and titanium alloy. These metal materials are non-degradable, and their implants must be removed through secondary surgery after the function of human tissue is restored. Therefore, degradable metal materials have good development prospects in the field of biomedical materials in the future. The degradable metal materials currently being developed are: magnesium alloy, iron alloy and zinc alloy. Magnesium alloys have gradually become a research hotspot in the field of biomedical materials due to their good biocompatibility and mechanical compatibility. The advantages of magnesium are as follows: (1) it is an essential mineral elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 刘运腾林涛周吉学唐守秋刘洪涛马百常庄海华
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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