Method for preparing biomedical magnesium alloy wire

A biomedical and magnesium alloy technology, applied in the field of preparation of biomedical magnesium alloy wire, can solve the problems of many drawing passes, low deformation, low wire plasticity, etc., and achieves clear preparation principle, improved corrosion resistance, The effect of meeting the requirements of strength and plasticity

Active Publication Date: 2017-07-04
YANGZHOU UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to aim at the traditional magnesium alloy wire preparation method, the room temperature forming deformation is low, the drawing passes are many, the drawing process needs annealing to eliminate work hardening, and the plasticity of the wire is also low; Heating for a long time causes coarse grains, material mechanical properties and processing properties to decline, and it is difficult to completely dissolve the second phase in the matrix after long-term homogenization treatment, and it is difficult to obtain single-phase supersaturated solid solutions. Based on the preparation method of biomedical magnesium alloy wire, a single-phase supersaturated solid solution structure can be obtained, which can not only meet the requirements of strength and plasticity, but also make the material have better corrosion resistance

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  • Method for preparing biomedical magnesium alloy wire
  • Method for preparing biomedical magnesium alloy wire
  • Method for preparing biomedical magnesium alloy wire

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preparation example Construction

[0020] A method for preparing a biomedical magnesium alloy wire, comprising the following steps:

[0021] (1) Metal magnesium and metal zinc are melted into liquid metal;

[0022] (2) Stirring and refining the liquid metal in step (1) to obtain refined liquid metal, mechanically stirring the molten metal for 3 to 5 minutes, then allowing the molten slag to float and then removing the slag;

[0023] (3) casting the refined liquid metal in step (2) into an alloy ingot;

[0024] (4) Perform homogenization heat treatment on the alloy ingot obtained in step (3) or directly perform equal-channel extrusion without heat treatment, the homogenization treatment temperature is 300-350 ° C, and the time is 2-6 hours; equal-channel angular extrusion The pressing temperature is between 200°C and 300°C, and the cumulative deformation is required to be over 400%;

[0025] (5) The material after medium channel extrusion in step (4) is processed into wire by multi-pass drawing. Before drawing...

Embodiment 1

[0029] Such as Figure 1~4 Shown, a kind of preparation method of biomedical magnesium alloy wire, Mg-6%wt.Zn alloy casts and there is bulk eutectic phase in the tissue after extrusion, such as figure 1 As shown, after the extruded sample was subjected to 200°C, 6-pass equal-channel extrusion treatment, the number of mesophases decreased, the size decreased, and a large number of fine precipitates were precipitated, such as figure 2 shown. After the extruded sample is drawn into a wire with a diameter of 0.3mm, there are a large number of mesophases distributed in bands in the microstructure, and the area between the mesophases distributed in bands appears due to uneven deformation. microcracks and holes, such as image 3 shown. However, the microstructure of the wire drawn after multi-channel equal channel extrusion has almost no second phase precipitation, the structure is uniform, and there are no cracks and holes, such as Figure 4 shown.

[0030] Such as Figure 5 ...

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Abstract

The invention provides a method for preparing a biomedical magnesium alloy wire and belongs to the technical field of metal materials. The method comprises the following steps: melting magnesium and zinc into liquid metal, stirring and refining the liquid metal to obtain refined liquid metal, and casting the refined liquid metal into an alloy ingot; then, carrying out homogenizing heat treatment on the alloy ingot or directly carrying out equal-channel pressing without heat treatment; and finally, machining the magnesium-zinc alloy subjected to the equal-channel pressing into the biomedical magnesium alloy wire through multi-channel drawing. According to the method, a single-phase oversaturated solid solution tissue is obtained after the wire drawing is finished, so that the strength and the ductility of the biomedical magnesium alloy wire are both higher than those of a wire which is directly drawn without equal-channel pressing. Accordingly, not only are the strength and ductility requirements met, but also the material corrosion resistance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a preparation technology of a magnesium alloy, in particular to a preparation method of a magnesium alloy wire for biomedical use. Background technique [0002] Biomedical magnesium alloy wire, as a degradable material, has broad application prospects in the biomedical field. It can be used as a raw material for human implanted medical devices such as degradable anastomotic wire, degradable esophageal stent, and degradable bladder stent. According to the requirements of clinical use, biomedical magnesium alloy wire should have high room temperature strength and plasticity to meet the requirements of the support integrity of implanted materials in the human body, and at the same time, in order to prevent the implanted device from corroding too quickly in the human body It also requires biomedical magnesium alloy wire to have better biocorrosion corrosion resistance. Magnesi...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/02C22F1/06
CPCC22C1/02C22C23/04C22F1/06
Inventor 严凯金朝阳程宏辉方双全费洪旗宋奎
Owner YANGZHOU UNIV
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