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Magnesium alloy and method for preparing magnesium alloy powder for laser molding to produce medical implants by using the magnesium alloy

A medical implant and laser forming technology, applied in the field of three-dimensional manufacturing, can solve the problems of fast corrosion rate of magnesium alloys, loss of support, degradation and fracture of struts, etc., achieve excellent corrosion resistance and mechanical properties, and improve plasticity. and deformability, the effect of improving corrosion resistance

Active Publication Date: 2016-08-17
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, commercial magnesium alloys corrode so quickly that implants become useless before the disease heals
For example, the WE43 magnesium alloy vascular stent has lost its continuity in about 28 days; the AZ31 stent has degraded and broken in about 2 months, and lost its supporting function.

Method used

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  • Magnesium alloy and method for preparing magnesium alloy powder for laser molding to produce medical implants by using the magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for preparing a magnesium alloy powder used for laser forming to produce a medical implant in this embodiment includes the following steps:

[0032] Stp1: Select 0.5 parts of Ca, 1.5 parts of Zn, 2.0 parts of Nd and 96 parts of Mg and mix them uniformly;

[0033] Stp2: Add the raw materials selected by Stp1 into the gas atomization device to prepare Mg-Ca-Zn-Nd alloy;

[0034] In this embodiment, the atomizing gas is argon, the gas pressure is 2MPa, the melting temperature is 900°C, and the gas flow velocity is 30m / s;

[0035] Stp3: The Mg-Ca-Zn-Nd alloy obtained by Stp2 is ball-milled with a high-energy ball-milling device.

[0036] In this example, the ball milling process was performed at a rotational speed of 400 rpm, a ball milling time of 5 hours, and a ball-to-material ratio of 10:1.

[0037] After testing, the magnesium alloy powder prepared in this example has a particle size range of 15-35 μm, and a sphericity greater than 97%.

Embodiment 2

[0039] The method for preparing a magnesium alloy powder used for laser forming to produce a medical implant in this embodiment includes the following steps:

[0040] Stp1: Select 0.5 parts of Ca, 3.0 parts of Zn, 2.5 parts of Nd and 94 parts of Mg and mix them uniformly;

[0041] Stp2: Add the raw materials selected by Stp1 into the gas atomization device to prepare Mg-Ca-Zn-Nd alloy;

[0042] In this embodiment, the atomizing gas is argon, the gas pressure is 1.2MPa, the melting temperature is 950°C, and the gas flow velocity is 25m / s;

[0043] Stp3: The Mg-Ca-Zn-Nd alloy obtained by Stp2 is ball-milled with a high-energy ball-milling device.

[0044] In this example, the rotational speed during the ball milling treatment was 600 rpm, the ball milling time was 2 h, and the ball-to-material ratio was 7:1.

[0045] After testing, the magnesium alloy powder prepared in this example has a particle size range of 15-45 μm, and a sphericity greater than 95%.

Embodiment 3

[0047] The method for preparing a magnesium alloy powder used for laser forming to produce a medical implant in this embodiment includes the following steps:

[0048] Stp1: Select 0.5 parts of Ca, 4.5 parts of Zn, 3.0 parts of Nd and 94 parts of Mg and mix them uniformly;

[0049] Stp2: Add the raw materials selected by Stp1 into the gas atomization device to prepare Mg-Ca-Zn-Nd alloy;

[0050] In this embodiment, the atomizing gas is argon, the gas pressure is 1.5MPa, the melting temperature is 880°C, and the gas flow velocity is 18m / s;

[0051] Stp3: The Mg-Ca-Zn-Nd alloy obtained by Stp2 is ball-milled with a high-energy ball-milling device.

[0052] In this embodiment, the rotational speed is 800 rpm, the ball milling time is 1 h, and the ball-to-material ratio is 8:1 during the ball milling treatment.

[0053] After testing, the magnesium alloy powder prepared in this example has a particle size range of 20-45 μm, and a sphericity greater than 96%.

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Abstract

The invention discloses a novel magnesium alloy, which is composed of 0.1-1.0%wt of Ca, 1.5-4.5%wt of Zn, 1.0-3.0%wt of Nd and Mg. The invention also discloses a method for using the magnesium alloy to prepare magnesium alloy powder for laser molding to produce medical implants. Firstly, raw materials are selected according to the ratio; then the selected raw materials are added to a gas atomization device to prepare Mg-Ca ‑Zn‑Nd alloy; finally, the Mg‑Ca‑Zn‑Nd alloy is ball-milled using a high-energy ball mill. The magnesium alloy of the invention has excellent biocompatibility, corrosion resistance and mechanical properties, and can be used as a raw material for preparing medical implants. The particle size of the magnesium alloy powder prepared by the method of the invention is fine and uniform (the particle size distribution range is 15-55 μm), and the sphericity is greater than 95%.

Description

technical field [0001] The invention belongs to the field of three-dimensional manufacturing, and relates to a magnesium alloy material for three-dimensional manufacturing, in particular to a method for using the magnesium alloy to prepare a magnesium alloy powder material for laser forming and producing medical implants. Background technique [0002] Magnesium alloys are ideal materials for the preparation of medical implants, with the following outstanding advantages: [0003] 1. Magnesium is a positive ion second only to potassium in human cells. It catalyzes or activates more than 300 kinds of enzymes in the body, plays a key role in protein synthesis by regulating the structure of ribosomal DNA and RNA, and plays a key role in muscle contraction, neuromotor function, physiological function, and prevention of circulatory system diseases and ischemic heart disease. The excretion of magnesium is mainly through the urinary system, and the absorption of magnesium in the hum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C23/04B22F9/04
Inventor 王林志张代军
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI