A magnesium-based alloy wire with controllable degradation and its preparation method

A magnesium-based alloy and magnesium alloy technology are applied in the field of magnesium-based alloy wire and its preparation, which can solve the problems of outer layer shedding, stress concentration, and reduce the mechanical properties of magnesium alloy wire, and achieve high strength and good deformation coordination. , the effect of broadening the scope of industrial applications

Active Publication Date: 2021-11-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A magnesium-based alloy wire with controllable degradation and its preparation method
  • A magnesium-based alloy wire with controllable degradation and its preparation method
  • A magnesium-based alloy wire with controllable degradation and its preparation method

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 magnesium-based alloy wire material with controllable degradation and a preparation method thereof. The wire material is composed of a coaxially arranged magnesium alloy core and a Mg-Y-Zn alloy outer layer. In terms of mass percentage, Mg The composition of the ‑Y‑Zn alloy is Y: 6.8-15.6%, Zn: 2.5-5.7%, and the rest is Mg; the preparation method includes batching, molding, composite casting, heat treatment and drawing. Compared with the existing materials, the magnesium-based alloy wire of the present invention has a gradient structure formed at the interface due to the similar elastic modulus of the outer layer and the magnesium alloy matrix, which ensures the good mechanical properties and deformation coordination of the alloy. At the same time, Mg-Y- The type and content of the long-period stacking ordered structural phase in the outer layer of the Zn alloy can be adjusted within a certain range, so that the wire has the performance of controlling the corrosion rate in a wide range, which can meet the requirements of different parts of the body for degradable metals. The degradation rate requirements.

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 Patents(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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