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Sr-containing magnesium alloy

A magnesium alloy and alloy technology, applied in the field of medical metal material preparation

Inactive Publication Date: 2019-07-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, medical metal materials need to be improved in the effectiveness, accuracy and timing of disease treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1, preparation cast state Mg-Si-Sr-Zn series magnesium alloy

[0064] Using pure Mg (99.99wt.%), pure Si (99.95wt.%), pure Sr (99.95%) and pure Zn (99.99wt.%) as raw materials, according to different mass ratios (Mg, Si, Sr, 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-Sr-Zn series magnesium alloy ingots. Among them, Mg-0.2Si- 1.0Sr-2.0Zn means that the mass ratios of Mg, Si, Sr, 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

[0065] Embodiment 2, preparation extruded state Mg-Si-Sr-Zn series magnesium alloy

[0066] First, the as-cast Mg-Si-Sr-Zn series magnesium alloy is prepared according to the steps in Example 1, and the Mg-Si-Sr-Zn series magnesium alloy rod is prepared by extrusion, and the radial extrusion is adopted to cast Mg-Si-Sr-Zn series magnesium alloy rods with a diameter of 10 mm were prepared by holding the ingot for 4 hours before extrusion, at a holding temperature of 280 °C, an extrusion temperature of 300 °C, an extrusion ratio of 36, and an extrusion speed of 1 mm / s.

Embodiment 3

[0067] Embodiment 3, Mg-Si-Sr-Zn series magnesium alloy microstructure analysis:

[0068] The Mg-Si-Sr-Zn series magnesium alloy in Example 1 was prepared by wire cutting to prepare 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.

[0069] figure 1 It is the metallographic phase of Mg-Si-Sr-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-0.5Sr-2.0 The grains of Zn alloy and Mg-0.4Si-0.5Sr-3.0Zn alloy are larger than those of other alloys, and the content of the second phase is less. ...

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Abstract

The invention discloses a Sr-containing magnesium alloy. The magnesium alloy contains Mg-Si-Sr-Zn and comprises, by mass percent, 0-1.0% (without including 0) of Si, 0-1.0% (without including 0) of Srand 2.0-3.0% of Zn. The magnesium alloy further comprises the trace elements including strontium, manganese, phosphorus, zirconium, stannum, iron and copper, and at least one of rare earth elements.The mass percent of the trace elements is 0-3% (without including 0). The mechanical strength of the Mg-Si-Sr-Zn series magnesium alloy provided by the invention meets the requirement for strength ofmedical implant materials, and by adjusting and controlling the contents of the alloy elements, and the degradation speeds of the elements in human bodies can be adjusted and controlled. Experimentalresults prove that the magnesium alloy has no marked toxicity to osteoblast and is good in biocompatibility, suffering of patients is reduced, the postoperative safety is improved, and the comfort level is increased.

Description

technical field [0001] The invention relates to a magnesium alloy containing Sr, belonging to the technical field of medical metal material preparation. Background technique [0002] Although traditional medical metal materials have good mechanical properties and corrosion resistance, their long-term existence in the body may cause varying degrees of stimulation to surrounding tissues: for example, the long-term existence of cardiovascular stents may induce intimal hyperplasia and lead to in-stent regeneration. In the occurrence of stenosis, the existence of the stent will also interfere with the endothelial cell function of the implanted blood vessel; 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 slow fracture healing and even induced Second fracture. In addition, corrosion and wear of implant materials lead to the dissolution of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/04C22F1/06A61K6/04A61L17/06A61L24/00A61L24/02A61L27/04A61L27/50A61L31/02A61L31/14C22C1/02
CPCC22C23/00C22C23/04C22C1/02C22F1/06A61L31/022A61L31/14A61L27/047A61L27/50A61L24/02A61L24/001A61L17/06A61L2430/02A61L2400/04A61K6/84
Inventor 郑玉峰李文婷成艳夏丹丹刘晓
Owner PEKING UNIV
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