Degradable controllable magnesium-based alloy wire and preparation method thereof

A magnesium-based alloy and magnesium alloy technology, applied in the field of magnesium-based alloy wire and its preparation, can solve problems such as stress concentration, lower mechanical properties of magnesium alloy wire, and outer layer shedding, so as to improve the quality of interfacial metallurgical bonding and widen the gap. Industrial application range, the effect of improving mechanical properties

Active Publication Date: 2020-11-20
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a magnesium-based alloy wire material with controllable degradation and its preparation method. On the basis of magnesium alloy rods, ordinary melting and casting is used to obtain a kind of long-period stacking order with good interfacial bonding. structure (LPSO) phase, and use subsequent heat treatment and hot drawing technology to obtain a magnesium-based alloy wire with controllable degradation. Application: Solve the problem that the existing outer layer and the magnesium alloy rod will cause stress concentration due to the mismatch of elastic modulus, which will cause the outer layer to fall off and reduce the mechanical properties of the magnesium alloy wire

Method used

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  • Degradable controllable magnesium-based alloy wire and preparation method thereof
  • Degradable controllable magnesium-based alloy wire and preparation method thereof
  • Degradable controllable magnesium-based alloy wire and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare Mg-1%Zn / Mg-6.8%Y-2.5%Zn composite material filament (mass percentage), its preparation method is as follows:

[0025] (1) Ingredients: weighing according to the ingredients of the above components;

[0026] (2) Mold making: Cut out a Mg-1%Zn alloy rod with a diameter of 4.5mm. The alloy rod is an alloy rod purchased on the market. After surface grinding and polishing, it is placed in the center of a cylindrical mold with an inner diameter of 5mm. ;

[0027] (3) Composite casting: pure zinc ingot, pure magnesium ingot and magnesium yttrium master alloy ingot in CO 2 and SF 6 Smelting under the protection of a mixed atmosphere to prepare Mg-Y-Zn molten alloy liquid, and then cast it in a cylindrical mold with Mg-1%Zn alloy rods; after casting, control the cylindrical mold to keep warm at 300 ° C for 30 minutes, and then cool naturally Remove the film at room temperature to obtain a magnesium alloy composite rod;

[0028] (4) Heat treatment: keep the magnesium ...

Embodiment 2

[0032] Prepare Mg-1%Zn / Mg-6.8%Y-2.5%Zn composite material filament (mass percentage), its preparation method is as follows:

[0033] (1) Ingredients: weighing according to the ingredients of the above components;

[0034] (2) mold making: cut out the Mg-1%Zn alloy rod that diameter is 4.5mm, be placed in the center of the cylinder mold that mold cavity inner diameter is 5mm after surface grinding and polishing;

[0035] (3) Composite casting: Melting pure zinc ingots, pure magnesium ingots and magnesium-yttrium intermediate alloy ingots under vacuum to prepare Mg-Y-Zn molten alloy liquid, and then casting it on a cylinder with Mg-1%Zn alloy rods placed In the body mold; after casting, the cylinder mold is controlled to keep warm at 300°C for 30min, and then naturally cooled to room temperature to release the film to obtain a magnesium alloy composite rod;

[0036] (4) Heat treatment: keep the magnesium alloy composite bar after stripping at 350°C for 1 hour, and then cool it ...

Embodiment 3

[0040] Prepare Mg-1%Zn / Mg-6.8%Y-2.5%Zn composite material filament (mass percentage), its preparation method is as follows:

[0041] (1) Ingredients: weighing according to the ingredients of the above components;

[0042] (2) mold making: cut out the Mg-1%Zn alloy rod that diameter is 4.5mm, be placed in the center of the cylinder mold that mold cavity inner diameter is 5mm after surface grinding and polishing;

[0043] (3) Composite casting: Melting pure zinc ingots, pure magnesium ingots and magnesium-yttrium intermediate alloy ingots under vacuum to prepare Mg-Y-Zn molten alloy liquid, and then casting it on a cylinder with Mg-1%Zn alloy rods placed In the body mold; after casting, the cylinder mold is controlled to keep warm at 300°C for 30min, and then naturally cooled to room temperature to release the film to obtain a magnesium alloy composite rod;

[0044] (4) Heat treatment: keep the magnesium alloy composite bar after stripping at 350°C for 4 hours, and then cool it...

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Abstract

The invention discloses a degradable controllable magnesium-based alloy wire and a preparation method thereof. The wire is composed of a magnesium alloy core body and a Mg-Y-Zn alloy outer layer whichare coaxially arranged, wherein the Mg-Y-Zn alloy consists of the following components in percentage by mass: 6.8-15.6% of Y, 2.5-5.7% of Zn and the balance of Mg. The preparation method comprises the following steps: preparing materials, moulding, composite casting, thermal treatment and a drawing process. Compared with an existing material, the magnesium-based alloy wire has the advantages that: elastic modus of the outer layer is similar to that of a magnesium alloy base body, a gradient structure is formed at an interface, good mechanical property and compatibility of deformation of the alloy are guaranteed; types and content of long-period orderly-stacked structure phases in the Mg-Y-Zn alloy outer layer are regulated within certain range, so that the wire has a controllable corrosion rate within a greater range, and can meet the requirements of the degradation rate of the degradable metal at different in-vivo parts.

Description

technical field [0001] The invention belongs to the field of biomedical metal materials, and in particular relates to a magnesium-based alloy wire with controllable degradation and a preparation method thereof. Background technique [0002] As a degradable metal, magnesium alloy has been paid more and more attention by researchers and related enterprises. Magnesium is an essential element for the human body, has good biocompatibility, and has better mechanical properties than polymer materials; and, the corrosion rate of magnesium is relatively fast, which is more suitable as a degradable metal than traditional iron-based alloys and titanium alloys. for relevant microdevices in vivo. Among them, absorbable medical suture is a potential application field of magnesium alloy. Compared with synthetic polymer materials, magnesium alloy has higher stiffness and better processing performance, so it is more suitable for surgical sutures. The clinical application of absorbable mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06B22D19/16B21C1/00
CPCB21C1/003B22D19/16C22C23/06C22F1/06
Inventor 刘欢王莉莎吴玉娜禚孝儒袁玉春江静华马爱斌
Owner HOHAI UNIV
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