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mg-si-ca-zn series magnesium alloy and its preparation method and application

A mg-si-ca-zn, magnesium alloy technology, applied in metal rolling, metal processing equipment, manufacturing tools, etc., can solve the problems of low mechanical properties, toxicity, etc.

Active Publication Date: 2021-06-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although high-purity magnesium has good biocompatibility and osteogenic properties, its mechanical properties are low, which limits its application.
However, the existing magnesium alloys commonly used in industry with good mechanical properties generally contain aluminum, zirconium and rare earth elements. Whether the release of these elements in the body will cause toxicity is still a problem to be clarified.

Method used

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  • mg-si-ca-zn series magnesium alloy and its preparation method and application
  • mg-si-ca-zn series magnesium alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1, preparation cast state Mg-Si-Ca-Zn series magnesium alloy

[0063] Using pure Mg (99.99wt.%), pure Si (99.95wt.%), pure Ca (99.95%) and pure Zn (99.99wt.%) as raw materials, according to different mass ratios (Mg, Si, Ca, Zn The mass ratios are 96.8:0.2:1.0:2.0, 97.3:0.2:0.5:2.0, 95.8:0.2:1.0:3.0, 96.3:0.2:0.5:3.0, 96.6:0.4:1.0:2.0, 97.1:0.4:0.5: 2.0, 95.6:0.4:1.0:3.0, 96.1:0.4:0.5:3.0) mix, in CO 2 +SF 6 Under the protection of the atmosphere, smelt at 750°C. After the raw materials are fully melted and kept warm for 20 minutes, they are poured into graphite molds preheated to 250°C to obtain Mg-Si-Ca-Zn series magnesium alloy ingots. Among them, Mg-0.2Si- 1.0Ca-2.0Zn means that the mass ratios of Mg, Si, Ca, and Zn are 96.8:0.2:1.0:2.0, respectively. Cooling to room temperature was then carried out by furnace cooling.

Embodiment 2

[0064] Embodiment 2, preparation extruded state Mg-Si-Ca-Zn series magnesium alloy

[0065] First, the as-cast Mg-Si-Ca-Zn series magnesium alloy was prepared according to the steps in Example 1, and the Mg-Si-Ca-Zn series magnesium alloy rod was prepared by extrusion, and the radial extrusion was adopted to cast Mg-Si-Ca-Zn series magnesium alloy rods with a diameter of 10mm were prepared by holding the ingot for 4h before extrusion, holding temperature 280°C, extrusion temperature 300°C, extrusion ratio 36, extrusion speed 1mm / s.

Embodiment 3

[0066] Embodiment 3, Mg-Si-Ca-Zn series magnesium alloy microstructure analysis:

[0067] The Mg-Si-Ca-Zn series magnesium alloy in Example 1 was prepared by wire-cutting a φ10×2mm sample, which was sequentially ground and polished by 400#, 800#, 1200# and 2000# SiC sandpaper series. After ultrasonic cleaning in acetone, absolute ethanol and deionized water for 15 min, dry at 25 °C. The sample was subjected to X-ray diffraction analysis, etched with 4% nitric acid alcohol for 5-30 seconds, washed with deionized water, dried, and observed under a metallographic microscope.

[0068] figure 1 It is the metallographic phase of Mg-Si-Ca-Zn magnesium alloy. It can be seen from the figure that after extrusion treatment, the grain size is significantly reduced, and the second phase is evenly distributed. Among them, Mg-0.4Si-0.5Ca-2.0 The grains of Zn alloy and Mg-0.4Si-0.5Ca-3.0Zn alloy are larger than those of other alloys, and the content of the second phase is less. When the co...

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Abstract

The invention discloses a Mg-Si-Ca-Zn series magnesium alloy, a preparation method and application thereof. The magnesium alloy of the present invention includes Mg-Si-Ca-Zn, the mass percentage of Si in the magnesium alloy is 0-1.0%, but excluding 0, the mass percentage of Ca is 0-1.0%, but excluding 0, Zn The mass percentage of is 2.0-3.0%, but 0 is not included. The magnesium alloy also includes trace elements, and the trace elements are at least one of strontium, manganese, phosphorus, zirconium, tin, iron, copper and rare earth elements; the mass percentage of the trace elements is 0-3 %, but not including 0. The mechanical strength of the Mg-Si-Ca-Zn series magnesium alloy of the present invention meets the strength requirements of medical implant materials, and the regulation and control of its degradation rate in vivo can be realized by regulating the content of added alloy elements. Experimental results show that it has no obvious toxicity to osteoblasts, has good biocompatibility, reduces the pain of patients, and increases postoperative safety and comfort.

Description

technical field [0001] The invention relates to a Mg-Si-Ca-Zn series magnesium alloy and a preparation method and application thereof, belonging to the field of medical metal materials. Background technique [0002] Traditional medical metal materials such as stainless steel, cobalt-chromium-molybdenum alloy, titanium alloy, etc. have good mechanical properties and corrosion resistance, and have important social value and economic benefits. However, the long-term existence of these implants in the body may cause varying degrees of irritation to the surrounding tissues, which may cause a series of consequences. For example, the elastic modulus of traditional metal internal fixation materials is much higher than that of human bone, and its long-term existence will cause a "stress shielding" effect, resulting in delayed fracture healing and even induced secondary fractures. For cardiovascular stents, their long-term existence may induce intimal hyperplasia and lead to in-stent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04B22D11/06C21D9/08C22C1/02C22F1/06A61L17/06A61L27/04A61L27/50A61L27/58A61L31/02A61L31/14B21C23/00B21B3/00B21J5/00
CPCA61L17/06A61L27/047A61L27/50A61L27/58A61L31/022A61L31/14A61L31/148A61L2430/02A61L2430/12B21B3/00B21C23/002B21J5/00B22D11/0611C21D9/08C22C1/02C22C23/04C22F1/06
Inventor 郑玉峰李文婷成艳夏丹丹刘晓
Owner PEKING UNIV
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