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Biodegradable magnesium-lithium alloy material and preparation method thereof

A magnesium-lithium alloy, biodegradable technology, applied in the field of magnesium alloy materials, can solve the problems that cannot be used to predict the corrosion situation in the body, the situation is complicated in the body, etc.

Inactive Publication Date: 2012-06-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, special attention should be paid to the fact that there are many types of alloying elements in magnesium alloys, which must be selected! When studying this kind of new materials, it must be noted that because the in vitro simulation of the degradable experiment process cannot be used to predict the in vivo corrosion situation, and the in vivo situation is quite complicated, the application of magnesium as a degradable material must also carry out a large number of biological studies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step 1: Weigh each element according to the nominal composition ratio, and mix to obtain the smelting raw material;

[0062] In the present invention, the nominal composition of the biodegradable magnesium-lithium alloy material is: 14% lithium (Li), 4% aluminum (Al), 1% zinc (Zn), 0.5% zirconium (Zr ), 0.3% of calcium (Ca), 0.5% of strontium (Sr) and the rest of magnesium (Mg), and the sum of the weight percentages of the above components is 100%. The mass percent purity of each element is not less than 99.0%.

[0063] Step 2: Melting ingots

[0064] Putting the smelting raw materials into a vacuum electric arc furnace for smelting, smelting evenly under an argon atmosphere with a mass percent purity of 99.999%, and then taking them out to obtain an alloy ingot;

[0065] Melting parameters: the vacuum degree of the vacuum electric arc furnace during smelting is ≤3×10 -2 Pa;

[0066] The melting temperature is 680°C;

[0067] Melting time is 6min;

[0068] Step 3:...

Embodiment 2

[0087] Step 1: Weigh each element according to the nominal composition ratio, and mix to obtain the smelting raw material;

[0088] In the present invention, the nominal composition of the biodegradable magnesium-lithium alloy material is: 7% lithium (Li), 1% aluminum (Al), 3.8% zinc (Zn), 0.3% zirconium (Zr ), 0.5% of calcium (Ca), 0.3% of strontium (Sr) and the rest of magnesium (Mg), and the sum of the weight percentages of the above components is 100%. The mass percent purity of each element is not less than 99.0%.

[0089] Step 2: Melting ingots

[0090] Putting the smelting raw materials into a vacuum electric arc furnace for smelting, smelting evenly under an inert protective atmosphere of argon with a mass percentage purity of 99.999%, and then taking it out to obtain an alloy ingot;

[0091] Melting parameters: the vacuum degree of the vacuum electric arc furnace during smelting is ≤3×10 -2 Pa;

[0092] The melting temperature is 750°C;

[0093] Melting time is 2...

Embodiment 3

[0113] Step 1: Weigh each element according to the nominal composition ratio, and mix to obtain the smelting raw material;

[0114] In the present invention, the nominal composition of the biodegradable magnesium-lithium alloy material is: 10% lithium (Li), 5.0% aluminum (Al), 0.6% zinc (Zn), 0.01% zirconium (Zr ), 0.1% of calcium (Ca), 0.3% of strontium (Sr) and the rest of magnesium (Mg), and the sum of the weight percentages of the above-mentioned components is 100%. The mass percent purity of each element is not less than 99.0%.

[0115] Step 2: Melting ingots

[0116] Put the smelting raw materials into the vacuum electric arc furnace for smelting, in SF 6 Take out the alloy ingot after smelting evenly under an inert protective atmosphere;

[0117] Melting parameters: the vacuum degree of the vacuum electric arc furnace during smelting is ≤3×10 -2 Pa;

[0118] The melting temperature is 700°C;

[0119] Melting time is 8min;

[0120] Step 3: Making Ingots

[0121] ...

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Abstract

The invention discloses a biodegradable magnesium-lithium alloy material and a preparation method of the biodegradable magnesium-lithium alloy material, wherein the biodegradable magnesium-lithium alloy material is composed of 7-14% of lithium, 0.5-5.0% of aluminum, 0.6-3.8% of zinc, 0.01-0.5% of zirconium, 0.1-0.5% of calcium, 0.3-0.7% of strontium and magnesium for the rest; the sum of the weight percentages of the components is 100%. The tensile strength of the material is 170-275 MPa; the yield strength is 125-255 MPa; the elongation rate is 15-65%; and the density is 1.31-1.60. The material can be used for processing blood vessel stents and joint prosthesis replacement parts.

Description

technical field [0001] The invention relates to a magnesium alloy material, more particularly to a biodegradable magnesium-lithium alloy material and a preparation method thereof. Background technique [0002] Lithium is the lightest metal element, its density is 0.53g / cm 3 , Only one-third of magnesium, adding lithium to magnesium alloy will reduce its density. [0003] In 1910, when Masing of Germany was studying the interaction between Li, Na, K and Mg, he found that Mg and Li had an interesting structural transformation, and considered this structure to be a superstructure. From 1934 to 1936, researchers from Germany, the United States, and the United Kingdom studied the structural transformation of magnesium-lithium alloys, measured the binary phase diagram, and successively confirmed that the hcp-bcc transformation occurred when the Li content increased to 5.7wt%. Since 1942, the Battelle Institute of the United States began to develop magnesium-lithium alloys on a l...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22F1/06A61L31/02A61L31/14A61L27/04A61L27/58
Inventor 周铁涛
Owner BEIHANG UNIV
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