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A method for preparing high-strength, toughness, and biocorrosion-resistant magnesium alloy pipes by baking

A bio-corrosion and magnesium alloy technology, applied to high-toughness and bio-corrosion-resistant magnesium alloy pipes, to prepare fields with high yield strength, which can solve the problem of inability to effectively improve the yield ratio and toughness simultaneously, endangering the bio-corrosion resistance of pipes, There is no improvement in mechanical properties, etc., to achieve the effect of improving mechanical properties and bio-corrosion resistance, excellent bio-corrosion resistance, and increasing safety and reliability

Active Publication Date: 2020-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method not only cannot effectively increase the yield ratio and toughness synchronously, but also greatly increases the production cost
What's more serious is that the addition of some elements such as iron, nickel, copper, cobalt, etc. will greatly harm the biological corrosion resistance of the pipe
On the other hand, the main methods to improve the biocorrosion resistance of magnesium alloy pipes are surface coating, micro-arc anodization and chemical conversion. Although these methods can effectively improve biocorrosion resistance, they do not improve the mechanical properties, and Many processes, low production efficiency, high cost, difficult to promote

Method used

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  • A method for preparing high-strength, toughness, and biocorrosion-resistant magnesium alloy pipes by baking
  • A method for preparing high-strength, toughness, and biocorrosion-resistant magnesium alloy pipes by baking
  • A method for preparing high-strength, toughness, and biocorrosion-resistant magnesium alloy pipes by baking

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, the raw material is Mg-0.5Ca-0.05Y (atomic percentage), and the semi-continuous casting method is used to cast a cylindrical magnesium alloy ingot with an outer diameter of 4.2 mm. Pulling, the processing rate of each pass is not more than 15%, and the intermediate annealing and water quenching are carried out at 420 ° C for 50 minutes after each drawing. After the last pass, a pipe with an outer diameter of 1.8mm and a wall thickness of 0.25mm was obtained, which was baked and water-quenched at 200°C for 40min. As a comparison, another sample was still annealed at 420°C for 50 minutes after the same casting and drawing process without baking. Subsequently, the mechanical properties of the two samples were tested at room temperature, and the biological environment immersion test was carried out according to the ASTM G31-72 standard in Hank’s simulated body fluid (see Table 1 for composition) at 37°C. The test results are shown in Table 2.

[0019] ...

Embodiment 2

[0025] In this embodiment, the raw material is Mg-0.9Zn-0.07Y (atomic percentage), and the semi-continuous casting method is used to cast a cylindrical magnesium alloy ingot with an outer diameter of 3 mm. After solution treatment, several times of drawing are carried out at room temperature. , The processing rate of each pass is not more than 15%, and the intermediate annealing and water quenching are carried out at 390°C for 80min after each drawing. After the last pass, a pipe with an outer diameter of 1.5 mm and a wall thickness of 0.15 mm was obtained, which was baked at 190° C. for 30 minutes and quenched in water. As a comparison, another sample was still annealed at 390°C for 80 minutes after the same casting and drawing process without baking. Subsequently, the mechanical properties of the two samples were tested at room temperature, and the biological environment immersion test was carried out according to the ASTM G31-72 standard in Hank’s simulated body fluid (see ...

Embodiment 3

[0030] In this embodiment, the raw material is Mg-1.2Sn-0.1Y (atomic percentage), and the semi-continuous casting method is used to cast a cylindrical magnesium alloy ingot with an outer diameter of 4.5 mm. After solution treatment, it is drawn several times at room temperature. Pulling, the processing rate of each pass is not more than 15%, and the intermediate annealing and water quenching are carried out at 440 ° C for 120 minutes after each drawing. After the last pass, a pipe with an outer diameter of 2.0 mm and a wall thickness of 0.30 mm was obtained, which was baked and water-quenched at 150°C for 60 minutes. As a comparison, another sample was still annealed at 440°C for 120 minutes after the same casting and drawing process without baking. Subsequently, the mechanical properties of the two samples were tested at room temperature, and the biological environment immersion test was carried out according to the ASTM G31-72 standard in Hank’s simulated body fluid (see Tab...

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Abstract

The invention discloses a method for preparing high-strength high-toughness bio-corrosion-resistant magnesium alloy tubes by utilizing baking. An alloy contains elements including one or more of calcium, zinc, stannum and bismuth, of which the atom percentage is 0.3 percent to 1.5 percent, and the alloy also contains yttrium of which the atom percentage is 0.03 percent to 0.3 percent and the balance of magnesium. Through a semi-continuous casting method, a magnesium alloy ingot blank with the outside diameter of 3mm to 6mm is prepared; the magnesium alloy ingot blank is subjected to solid solution treatment and is drawn out for several times at a room temperature; a processing ratio is not more than 15 percent each pass, and intermediate annealing and water quenching can be carried out after the magnesium alloy ingot blank is drawn out every pass; and finally, the tubes are baked and subjected to water quenching for 10 minutes to 120 minutes at 100 DEG C to 220 DEG C so as to obtain the tubes with the outside diameter of 1.5mm to 2.5mm and the wall thickness of 0.15mm to 0.5mm. Compared with magnesium alloy tubes which are not baked, the magnesium alloy tubes which are baked underthe same service condition have the advantages that the yield strength, the toughness and the bio-corrosion resistant performance are obviously and simultaneously improved.

Description

technical field [0001] The invention relates to a method for preparing high-strength, toughness, and biocorrosion-resistant magnesium alloy pipes by baking, and specifically relates to a method of baking a precipitated phase precursor to form a pin on the subgrain boundary, thereby preparing a high-yield strength, Magnesium alloy tubing with high toughness and biocorrosion resistance. It belongs to the technical field of non-ferrous metal material processing. Background technique [0002] Magnesium alloy tubes have gradually become a research hotspot in biomedical materials due to their good biological and mechanical compatibility, complete degradability and abundant resources. However, in practical applications, it is still difficult for magnesium alloy pipes to meet the common requirements of strength, toughness and biocorrosion resistance at the same time. Poor comprehensive mechanical properties and poor biocorrosion resistance severely limit the scope of application of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C23/00B21C37/06C22F1/06
Inventor 霍庆欢张至柔杨续跃
Owner CENT SOUTH UNIV
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