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Mg-RE-series magnesium alloy and preparing method and application thereof

A magnesium alloy, mg-re technology, applied in the field of medical metal materials and its preparation, can solve problems such as distortion, dissolution of implant materials, human allergies and inflammatory reactions

Active Publication Date: 2019-04-26
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because of corrosion, wear and harmful ions leaching out of implant materials, it will cause human allergic and inflammatory reactions, and even lead to serious diseases such as distortion and induced cancer.
Therefore, medical metal materials need to be improved in the effectiveness, accuracy and timing of disease treatment

Method used

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  • Mg-RE-series magnesium alloy and preparing method and application thereof
  • Mg-RE-series magnesium alloy and preparing method and application thereof
  • Mg-RE-series magnesium alloy and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1. Preparation of as-cast Mg-RE series magnesium alloy

[0067] The raw materials used in the test are pure Mg (99.9wt.%), ordinary industrial grade rare earth (TREM> 99.5wt.%) as the raw material, according to the mass ratio in the following table:

[0068] Types of RE

RE content

Mg content

Eu

1％

margin

Eu

3％

margin

Tb

1％

margin

Tb

5％

margin

Dy

1％

margin

Dy

10％

margin

Er

1％

margin

Er

10％

margin

Tm

1％

margin

Tm

10％

margin

Yb

1％

margin

Yb

3％

margin

Lu

1％

margin

Lu

10％

margin

[0069] Mixed in CO 2 +SF 6 Under the protection of the atmosphere, the temperature is increased to 50-100°C higher than the melting point of the alloy, and the temperature is kept for 20 minutes with stirring. The liquid metal is poured into a graphite mold preheated to 250°C, cooled to room temperature with the furnace, and out of the furnace to obtain the Mg-RE magnesium alloy.

[0070] figure 1 This is a photo of the microstructure of the above sample. It can be seen from...

Embodiment 2

[0071] Example 2: Preparation of extruded Mg-RE magnesium alloy

[0072] First, prepare as-cast Mg-RE series magnesium alloy ingots according to the steps in Example 1 of the present invention, and prepare Mg-RE series alloy bars by extrusion. The ingot is kept for 4 hours and the temperature is kept It is 450°C or 500°C, ready for use after water cooling. The extrusion temperature is 450°C or 500°C, the extrusion speed is 1mm / s, and the extrusion ratio is 11 to prepare a Mg-RE alloy bar with a diameter of 12mm.

[0073] figure 2 It can be seen from the microstructure photos of the above samples that the extrusion significantly improves the microstructure of the material, the original coarse grains are significantly reduced, and the coarser second phase is also broken and its distribution is more uniform. The metallographic phase of a single-phase alloy or an extruded alloy containing a small amount of a second phase presents a uniform equiaxed crystal morphology, such as Mg-1Yb ...

Embodiment 3

[0074] Example 3 Corrosion performance test of Mg-RE series magnesium alloy

[0075] The extruded Mg-RE magnesium alloy prepared in Example 2 was cut and processed into block samples of Φ12mm×2mm, which were polished with 800#, 1200#, and 2000# sandpaper in sequence, and ultrasonically cleaned with ethanol. Then Hank’s simulated body fluid (NaCl 8.0g, CaCl 2 0.14g, KCl 0.4g, NaHCO 3 0.35g, glucose 1.0g, MgCl 2 6H 2 O 0.1g, Na 2 HPO 4 2H 2 O 0.06g, KH 2 PO 4 0.06g,MgSO 4 7H 2 O 0.06g dissolved in 1L deionized water) for immersion experiment, the ratio of the volume of the solution to the surface area of ​​the sample is 20mL / cm 2 , Record the pH change of the solution every day, such as image 3 Shown.

[0076] by image 3 It can be seen that in the early stage of soaking, the pH value of each combination gold increases at a significantly higher rate than in the later stage. In general, the corrosion rate of Mg-1Eu is significantly lower than that of other Mg-RE binary alloys, a...

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Abstract

The invention aims at providing an Mg-RE-series magnesium alloy and a preparing method and application thereof. The magnesium alloy comprises Mg and RE, wherein RE is at least one of Tb, Dy, Er, Tm, Yb, Lu and Eu. By mass percent, the mass percent of the RE in the magnesium alloy is 0-15.0%. The Mg-RE-series magnesium alloy has excellent comprehensive mechanical performance, degradability and cytocompatibility and can be used for preparing degradable medical implanted bodies.

Description

Technical field [0001] The invention belongs to the technical field of medical metal materials and their preparation, and specifically relates to a Mg-RE series magnesium alloy and a preparation method and application thereof. Background technique [0002] Traditional medical metal materials such as stainless steel, cobalt-chromium-molybdenum alloy, titanium alloy, etc. have good mechanical properties and corrosion resistance, and have important social values ​​and economic benefits. However, if it is not removed by a second operation, these foreign materials will remain in the body for a long time as a foreign body, which may cause different degrees of irritation to the surrounding tissues, and may cause a series of serious consequences. For example, the elastic modulus of traditional metal internal fixation materials is much higher than that of human bones. Their long-term existence causes a "stress shielding" effect, which easily leads to lack of sufficient stress stimulation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/02C22F1/06A61L27/04
CPCA61L27/047C22C1/02C22C23/06C22F1/06
Inventor 郑玉峰边东刘嘉宁成艳夏丹丹
Owner PEKING UNIV
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