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Preparation method of zinc alloy pipe for degradable cardiovascular stent

A zinc alloy and cardiovascular technology, applied in the field of zinc alloy pipe preparation, can solve the problems of long preparation process and complicated process, and achieve the effects of simplifying the processing technology, improving the processing efficiency and reducing the number of annealing times.

Pending Publication Date: 2021-09-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a forming process for preparing zinc alloy pipes, so as to solve the problems of long and complicated process for the preparation of zinc alloy pipes for degradable cardiovascular stents

Method used

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  • Preparation method of zinc alloy pipe for degradable cardiovascular stent
  • Preparation method of zinc alloy pipe for degradable cardiovascular stent
  • Preparation method of zinc alloy pipe for degradable cardiovascular stent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the zinc-magnesium-manganese alloy contains 0.05% of Mg, 0.5% of Mn, unavoidable impurities ≤ 10ppm, and the balance of Zn.

[0036] (1) Prepare metal zinc, metal magnesium, and metal manganese as raw materials for smelting according to the stated ingredients. First, heat the metal zinc to 550±5°C. After it melts, add magnesium and manganese in turn. After it is completely melted, stir uniform. Lower the molten metal to 480±10°C, cast it into a water-cooled iron mold to cool down, and obtain a hollow ingot;

[0037] (2) Homogenization treatment: the ingot is kept at 380°C for 12 hours, and then cooled to room temperature in water;

[0038] (3) Hot extrusion deformation: heat the hollow ingot billet at 150°C for 30 minutes, and then carry out hot extrusion forming at 100°C, with an extrusion speed of 0.5mm / s;

[0039] (4) Hot drawing deformation: the accumulated deformation of hot drawing is 75-80%. The hot drawing process parameters are as follows:...

Embodiment 2

[0049] The composition of the zinc-magnesium-copper alloy contains 0.05% of Mg, 0.5% of Cu, unavoidable impurities ≤ 10ppm, and the balance of Zn.

[0050] (1) Prepare metal zinc, metal magnesium, and metal copper as raw materials for smelting according to the stated ingredients. First, heat the metal zinc to 550±5°C. After it melts, add magnesium and copper elements in turn. After they are all melted, stir uniform. Lower the molten metal to 480±10°C, cast it into a water-cooled iron mold to cool down, and obtain a hollow ingot;

[0051] (2) Homogenization treatment: the ingot is kept at 380°C for 15 hours, and then cooled to room temperature in water;

[0052] (3) Hot extrusion deformation: heat the hollow ingot billet at 150°C for 30 minutes, and then carry out hot extrusion forming at 100°C, with an extrusion speed of 1mm / s;

[0053] (4) Hot drawing deformation: the accumulated deformation of hot drawing is 85-95%. The hot drawing process parameters are as follows: the d...

Embodiment 3

[0057] The composition of the zinc-magnesium-phosphorus alloy contains Mg 0.05%, P 0.02%, unavoidable impurities ≤ 10ppm, and Zn as the balance.

[0058] (1) Prepare metal zinc, metal magnesium, and phosphorus as raw materials for smelting according to the stated ingredients. First, heat the metal zinc to 550±5°C. After it melts, add magnesium and phosphorus elements in turn. After it is completely melted, stir evenly . Lower the molten metal to 480±10°C, cast it into a water-cooled iron mold to cool down, and obtain a hollow ingot;

[0059] (2) Homogenization treatment: the ingot is kept at 380°C for 20 hours, and then cooled to room temperature in water;

[0060] (3) Hot extrusion deformation: heat the hollow ingot billet at 150°C for 30 minutes, and then carry out hot extrusion at 100°C, with an extrusion speed of 0.2mm / s;

[0061] (4) Hot drawing deformation: the accumulated deformation of hot drawing is 80-85%. The hot drawing process parameters are as follows: the dra...

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Abstract

The invention relates to a preparation method of a zinc alloy pipe for a degradable cardiovascular stent, and belongs to the technical field of material preparation. The zinc alloy pipe comprises the following alloy components in percentage by weight: 0.05% of Mg, 0.2-0.5% of Mn, 0.1-0.5% of Cu, 0.02-0.05% of P, less than or equal to 10ppm of inevitable impurities and the balance of Zn. The preparation method comprises the following steps: (1) heating pure zinc to 550 + / -5 DEG C, adding other metals after melting, uniformly stirring, cooling the molten metal to 480 + / -10 DEG C, and casting; (2) preserving heat at 380 DEG C for 10-24 hours, and then cooling to room temperature in water; (3) conducting heat preservation for 30 min at the temperature of 150 DEG C, and then conducting hot extrusion forming at the temperature of 100 DEG C, wherein the extrusion speed is 0.2-1 mm / s; (4) conducting multi-pass hot drawing, wherein the accumulated deformation is 75-95%, the drawing speed is 0.2-10 mm / s, the drawing temperature is 100 DEG C, and the deformation of each pass is 10-15%; and (5) conducting cold drawing finishing and annealing treatment, and finally conducting air cooling to the room temperature. The preparation method of the zinc alloy pipe for the degradable cardiovascular stent is suitable for forming of various zinc alloy pipes so as to meet different use requirements.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a zinc alloy pipe material that can be used for degradable cardiovascular stents. Background technique [0002] Due to their suitable degradation rate and good biocompatibility, zinc and zinc alloys have become the frontier and research hotspot in the field of biomaterials. At present, the tube is used as a precursor for the preparation of cardiovascular stents, and its forming is one of the important bottlenecks restricting the application of zinc alloys. [0003] At present, the preparation methods of degradable cardiovascular stent tubes mainly include bar drilling-drawing-annealing-drawing, bar drilling-rolling-drawing-annealing-drawing, extrusion tube billet-drawing -Annealing-drawing-annealing, extruded tube blank drilling-rolling-drawing-annealing-drawing, etc. However, since Zn has a close-packed hexagonal structure, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/00C22C18/02C22F1/16C22C1/02C21D1/26C21D8/10C21D9/08B21C37/06A61F2/82A61L31/02A61L31/14
CPCC22C18/00C22C18/02C22F1/165C22C1/02C21D1/26C21D8/10C21D9/08B21C37/06A61F2/82A61L31/022A61L31/148
Inventor 吕金泽李博轩任玉平李洪晓秦高梧
Owner NORTHEASTERN UNIV
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