Medical Mg-Gd-Zn (-Ca) magnesium alloy with LPSO structure and preparation method thereof

A magnesium alloy, mg-gd-zn technology, applied in the field of low-alloyed medical magnesium alloy and its preparation, can solve the problems of high content of rare earth elements, excessive degradation rate, uneven degradation, etc., to improve mechanical properties, process Simple, Inexpensive Effects

Active Publication Date: 2016-12-21
NANJING INST OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a Mg-Gd-Zn(-Ca) medical magnesium alloy with an LPSO structure in view of the problems of too fast degradation rate, uneven degradation, high content of rare earth elements, and high cost in current biological magnesium alloys. and its preparation method

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  • Medical Mg-Gd-Zn (-Ca) magnesium alloy with LPSO structure and preparation method thereof
  • Medical Mg-Gd-Zn (-Ca) magnesium alloy with LPSO structure and preparation method thereof
  • Medical Mg-Gd-Zn (-Ca) magnesium alloy with LPSO structure and preparation method thereof

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preparation example Construction

[0034] The preparation method of the Mg-Gd-Zn(-Ca) medical magnesium alloy with LPSO structure of the present invention, comprises the following steps successively:

[0035] (1) Smelting: First heat the crucible to 400°C and start feeding CO 2 and SF 6 Protective gas with a flow ratio of 99:1, then put high-purity magnesium ingots (purity greater than 99.95%) into the crucible, and add Mg-Gd master alloy (impurity content less than 0.05%) when the high-purity magnesium is completely melted and the temperature rises to 760°C, After it is completely melted, add pure Zn (purity greater than 99.995%) and Mg-Ca master alloy (impurity content less than 0.05%). When the raw materials are completely melted, turn on the automatic stirrer to stir for 4-8 minutes, and then set the temperature to After standing at 700°C for 10-20 minutes, it is cast into a steel mold with a cooling system under the protection of protective gas, and the cooling rate of the ingot is controlled within the r...

Embodiment 1

[0040] Using high-purity magnesium (Mg purity greater than or equal to 99.95%), Mg-Gd master alloy (impurity content less than 0.05%) and pure zinc (Zn purity greater than or equal to 99.995%) as raw materials, according to Mg-3.0Gd-0.8Zn (mass Fraction) alloy composition ratio for smelting. When smelting, first heat the crucible to 400 °C and start feeding CO 2 and SF 6 Protective gas with a flow ratio of 99:1, then put the high-purity magnesium ingot into the crucible, when the high-purity magnesium is completely melted and the temperature rises to 760°C, add Mg-Gd master alloy, after it is completely melted, add pure Zn, when the raw material is completely melted Finally, turn on the automatic stirrer and stir for 5 minutes, then set the temperature to 700°C and let it stand for 10 minutes, then cast it into a steel mold with a cooling system under the protection of protective gas, and control the cooling rate of the ingot at 40°C / min. Obtain Mg-3.0Gd-0.8Zn magnesium al...

Embodiment 2

[0042] High-purity magnesium (Mg purity greater than or equal to 99.95%), Mg-Gd master alloy (impurity content less than 0.05%), pure zinc (Zn purity greater than or equal to 99.995%) and Mg-Ca master alloy (impurity content less than 0.05%) ) as the raw material, smelted according to the alloy composition ratio of Mg-3.0Gd-0.8Zn-0.6Ca (mass fraction). When smelting, first heat the crucible to 400°C and start feeding CO 2 and SF 6 Protective gas with a flow ratio of 99:1, then put the high-purity magnesium ingot into the crucible, when the high-purity magnesium is completely melted and the temperature rises to 760°C, add the Mg-Gd master alloy, after it is completely melted, add pure Zn, and then add Mg- Ca intermediate alloy, when the raw material is completely melted, turn on the automatic stirrer and stir for 6 minutes, then set the temperature to 700°C and let it stand for 10 minutes, then cast it into a steel mold with a cooling system under the protection of protective ...

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Abstract

The invention relates to a medical Mg-Gd-Zn (-Ca) magnesium alloy with an LPSO structure and a preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure and belongs to the field of medical magnesium alloy preparation. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises, by mass, 1.0%-3.5% of Gd, 0.3%-1.2% of Zn and 0-1.0% of Ca. The preparation method of the medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure comprises the steps that raw materials which are in an appropriate ratio are placed in a crucible containing mixed protective gases of CO2 and SF6 in sequence for melting, stirring, standing and casting, wherein during casting, the solidification rate is controlled; and a cast ingot is placed in a resistance furnace with a protective atmosphere for heat treatment, and then rod materials are formed through extrusion. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has the advantages that the contents of the Gd element and the Zn element are low, the biological safety is high, the cost is low, and the technology is simple. Cast alloy tissue and extrusion alloy tissue both have the LPSO structure. Besides, after Ca is added, a divorced eutectic (Mg, Zn, Ca) 3Gd phase is formed in the cast alloy and is beneficial for the abrasion resistance performance of the alloy, the microstructure is adjustable, and the corrosion resistance of a material can be effectively improved. The medical Mg-Gd-Zn (-Ca) magnesium alloy with the LPSO structure has broad application prospect in the biomedical fields of orthopedics and cardiovascular stent implantation.

Description

technical field [0001] The invention relates to a medical magnesium alloy and a preparation method thereof, in particular to a low-alloyed medical magnesium alloy with an LPSO structure used in the field of biodegradable implant materials and a preparation method thereof. Background technique [0002] The elastic modulus of magnesium alloy is close to that of human bone, which can effectively alleviate the stress shielding effect, and bio-magnesium alloy has the advantages of good mechanical properties, biocompatibility, and in vivo degradability. Ideal for entering materials. However, at present, the degradation rate of most magnesium alloys in the human environment medium is too fast, and the degradation is uneven, which can easily lead to premature loss of mechanical integrity after material implantation, resulting in surgical failure. The magnesium alloy cardiovascular stent material WE43 developed by Biotronik was originally an industrial commercial magnesium alloy, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06C22F1/02
CPCC22C1/03C22C23/06C22F1/02C22F1/06
Inventor 章晓波戴建伟巴志新贺显聪张保森王章忠
Owner NANJING INST OF TECH
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