High-toughness corrosion-resistant biological magnesium alloy and preparation method thereof

A magnesium alloy and corrosion-resistant technology, which is applied in the field of high-strength, toughness, and corrosion-resistant bio-magnesium alloys and their preparation, can solve problems such as high production costs and magnesium alloy ablation, and achieve low cost, reduced grain size, and excellent mechanical properties Effect

Inactive Publication Date: 2019-02-01
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the active chemical properties of magnesium, argon is usually used as the atomizing gas in the process of spraying magnesium alloys, and the ablation phenomenon of magnesium alloys is more prominent, and the production cost is higher

Method used

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  • High-toughness corrosion-resistant biological magnesium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] By weight percentage, the composition of magnesium alloy is Zn4%, Ca1.5%, Ti 0.4%, and the rest is Mg. The preparation process is as follows:

[0021] (1) Prepare the raw materials according to the furnace load of 20Kg, add the pure magnesium ingot into the electromagnetic induction furnace, and melt the pure magnesium under the protection of the flux; when the melt temperature reaches 710 ℃, add the Mg-40%Ca master alloy Add it in batches until it is completely melted. After stirring, heat the melt to reach 730°C, and then add Zn 78.2 Mg 17.2 Ti 4.6 After the master alloy is completely melted, it is stirred, kept for 20 minutes, and cooled in CO. 2 +SF 6 The mixed gas protective atmosphere injects the melt into the inflow funnel of spray deposition.

[0022] (2) Select nitrogen as the atomizing gas, the deposition process parameters are: the atomizing pressure is 0.8MPa, the magnesium alloy melt flow rate is 6Kg / min, and the atomizing gas flow rate is 15Nm 3 / min,...

Embodiment 2

[0025] By weight percentage, the composition of magnesium alloy is: Zn 6%, Ca 2%, Ti 0.2%, and the rest is Mg. The preparation process is as follows:

[0026] (1) Prepare the raw materials according to the furnace load of 25Kg, add the pure magnesium ingot into the electromagnetic induction furnace, and melt the pure magnesium under the protection of the flux; when the melt temperature reaches 700 ℃, add the Mg-30%Ca master alloy Add in batches until completely melted, heat the melt to 740°C after stirring, and then add Zn 77 Mg 20 Ti 3 After the master alloy is completely melted, it is stirred, kept for 20 minutes, and cooled in CO. 2 +SF 6 The mixed gas protective atmosphere injects the melt into the inflow funnel of spray deposition.

[0027] (2) Select nitrogen as the atomizing gas, the deposition process parameters are: the atomizing pressure is 0.7MPa, the magnesium alloy melt flow rate is 7Kg / min, and the atomizing gas flow rate is 20Nm 3 / min, the magnesium alloy ...

Embodiment 3

[0030] By weight percentage, the magnesium alloy composition is: Zn 8%, Ca 3%, Ti 0.5%, and the rest is Mg. The preparation process is as follows:

[0031] (1) Prepare the raw materials according to the furnace load of 25Kg, add the pure magnesium ingot into the electromagnetic induction furnace, and melt the pure magnesium under the protection of the flux; when the melt temperature reaches 720 ℃, add the Mg-40%Ca master alloy Add in batches until completely melted, and heat the melt to 740°C after stirring, then add Mg-Zn alloy and Zn 77 Mg 20 Ti 3 After the master alloy is completely melted, it is stirred with tools until it is uniform, and the melt is poured into the guide funnel for spray deposition under the protective atmosphere of argon gas.

[0032] (2) Select nitrogen as the atomizing gas, the deposition process parameters are: the atomizing pressure is 0.8MPa, the magnesium alloy melt flow rate is 8Kg / min, and the atomizing gas flow rate is 15Nm 3 / min, the compos...

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Abstract

The invention discloses a high-toughness corrosion-resistant biological magnesium alloy and a preparation method thereof. The composition of the magnesium alloy is Mg-Zn-Ca-Ti, wherein the mass fraction of Zn is 2%-8%, the mass fraction of Ca is 1%-3%, and the mass fraction ratio of Zn to Ca is 2 to 4, the mass fraction of Ti is 0.1%-0.8%, after the raw materials are smelted, a blank ingot of thecomposite material is prepared by adopting an injection deposition process, and the blank ingot is processed into a finished product. The prepared magnesium alloy is uniform in structure, fine in grain, mechanical property and corrosion resistance are excellent, the biocompatibility is excellent, and the magnesium alloy has a wide application prospect in the fields of engineering structural members and biological implantable devices.

Description

technical field [0001] The invention relates to a high-strength-toughness-corrosion-resistant biological magnesium alloy and a preparation method thereof, belonging to the technical field of alloy materials. Background technique [0002] Magnesium and its alloys are not only structural materials with excellent performance, but also one of the good bioimplant materials, with the characteristics of degradability, absorbability and osteoconduction. In addition, the elastic modulus and density of magnesium alloys are close to those of dense human bone, which can reduce the stress shielding effect caused by the use of traditional metal fixation materials such as stainless steel and titanium alloys. Among many magnesium alloy systems, Mg-Ca alloys have attracted attention due to their good biocompatibility. Due to the density of Ca (1.55g / cm 3 ) than Mg (1.74g / cm 3 ) is low, adding Ca can effectively reduce the density of implanted devices, and Ca is one of the main elements of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C1/03B22F3/115
CPCB22F3/115C22C1/03C22C23/04
Inventor 李旋江昊陈珂曹议文巴志新王章忠
Owner NANJING INST OF TECH
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