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Biodegradable magnesium alloy free of rare earth elements as well as preparation method and application of biodegradable magnesium alloy

A rare earth element and magnesium alloy technology, applied in the field of medical materials, can solve the problems of corrosion resistance decline, strength decline, rapid deterioration, etc., and achieve the effect of reducing the area and controlling the degradation speed

Pending Publication Date: 2022-05-31
SHANGHAI KINDLY MEDICAL INSTR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems that the degradation rate of the existing biodegradable magnesium alloy is uncontrollable, and the degradation and corrosion are too fast, it will cause biological toxicity, the strength of the non-addition of rare earth will be reduced, and the corrosion resistance will be reduced, thereby providing a rare earth-free magnesium alloy. Elemental Biodegradable Magnesium Alloys
[0009] The inventors of the present invention have found that although magnesium alloy orthopedic implant materials do not add rare earth elements, the problems of bioincompatibility and cytotoxicity caused by rare earth elements can be alleviated, but the degradable magnesium alloys in the prior art that do not contain rare earth elements There are still problems such as low strength, severe pitting or pitting corrosion and rapid deterioration that cannot be resolved

Method used

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  • Biodegradable magnesium alloy free of rare earth elements as well as preparation method and application of biodegradable magnesium alloy
  • Biodegradable magnesium alloy free of rare earth elements as well as preparation method and application of biodegradable magnesium alloy
  • Biodegradable magnesium alloy free of rare earth elements as well as preparation method and application of biodegradable magnesium alloy

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Embodiment 1

[0044] This embodiment provides a biodegradable magnesium alloy that does not contain rare earth elements. The metal powder is fully mixed, and then melted at 700 ℃ and then cast into shape; heat treatment: heat the alloy obtained by casting, control the temperature to 200 ℃, anneal for 1 min, and cool; hot extrusion: put the alloy after heat treatment into the hot extrusion In the pressed die, the temperature is controlled at 300°C, the extrusion rate is controlled at 5mm / s, and the extrusion ratio is set at 10:1; rolling forming: rolling at 350°C, the speed is controlled at 30m / min, and each pass is rolled. The down-pressure amount of the system is controlled at 60%, and the number of passes is no more than 10 times, so as to obtain a formed biodegradable magnesium alloy.

Embodiment 2

[0046] This embodiment provides a biodegradable magnesium alloy that does not contain rare earth elements, and the preparation method is as follows: The metal powder is fully mixed, and then melted at 750 ℃ ​​and cast into shape; heat treatment: heat the alloy obtained by casting, control the temperature to 250 ℃, anneal for 2 minutes, and cool; hot extrusion: put the alloy after heat treatment into the hot extrusion In the pressed die, the temperature is controlled at 300°C, the extrusion rate is controlled at 5mm / s, and the extrusion ratio is set to 15:1; rolling forming: rolling at 350°C, the speed is controlled at 20m / min, and each pass is rolled. The down pressure of the pass is controlled at 50%, and the pass is not more than 10 times to obtain a formed biodegradable magnesium alloy.

Embodiment 3

[0048] This embodiment provides a biodegradable magnesium alloy without rare earth elements. The preparation method is as follows: 90 parts of Mg, 5 parts of Zn, 1 part of Ca, 1 part of Mn, 0.8 parts of Zr, 1.2 parts of Sn, 1 part of Sr The metal powder is fully mixed, and then melted at 700 ℃ and then cast into shape; heat treatment: heat the alloy obtained by casting, control the temperature to 200 ℃, anneal for 1 min, and cool; hot extrusion: put the alloy after heat treatment into the hot extrusion In the pressed die, the temperature is controlled at 250°C, the extrusion rate is controlled at 5mm / s, and the extrusion ratio is set at 15:1; rolling forming: rolling at 320°C, the speed is controlled at 30m / min, and each pass is rolled. The down pressure of the pass is controlled at 80%, and the pass does not exceed 10 times to obtain a formed biodegradable magnesium alloy.

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Abstract

The invention provides a biodegradable magnesium alloy without rare earth elements. The magnesium alloy comprises the following elements in percentage by mass: 1.0-5.0% of Zn; 0.1 to 1.0 percent of Mn; 0.1 to 1.0 percent of Ca; 0.1 to 1.0 percent of Sr; 0.1 to 3.0% of Sn; 0.1 to 0.8 percent of Zr; impurities in the magnesium alloy do not contain rare earth. The invention further provides a preparation method of the biodegradable magnesium alloy and application of the biodegradable magnesium alloy in preparation of medical instruments. According to the invention, Mg is taken as a main body and is mixed with Zn, Ca and Mn in a specific proportion to prepare the alloy, the degradation speed is controllable, the alloy has relatively high mechanical strength, elements harmful to a human body do not exist, and the alloy is degraded in the human body and does not influence the human body.

Description

technical field [0001] The invention relates to the field of medical materials, in particular to a rare earth element-free biodegradable magnesium alloy and a preparation method and application thereof. Background technique [0002] Medical metal materials are biomaterials that have developed rapidly in recent years. Due to their excellent mechanical properties, they are more suitable for implant materials in load-bearing parts than non-metallic materials. Commonly used medical metal materials today include stainless steel, titanium and titanium alloys, cobalt-chromium alloys, precious metals, magnesium alloys, and the like. [0003] Magnesium alloys are widely used medical metal materials due to their low density, high strength, and ease of machining and welding. Magnesium in the human body undergoes a chemical reaction in the solution medium and is converted into magnesium ions. Magnesium ions adjust the balance through absorption in the body and metabolism in the kidneys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/00B22D1/00C22F1/06B21C37/00A61L27/04A61L27/58A61L31/02A61L31/14
CPCC22C23/04C22C23/00C22F1/06B22D1/002B21C37/00A61L27/047A61L27/58A61L31/022A61L31/148C22C1/02
Inventor 梁栋科赵铮尚磊李涛林森
Owner SHANGHAI KINDLY MEDICAL INSTR CO LTD
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