A method for preparing needle-like second phases to improve the degradation resistance of medical magnesium alloys

A magnesium alloy and needle-like technology is applied in the field of preparing needle-like second phase to improve the degradation resistance of medical magnesium alloys, and can solve the problems of affecting the growth and healing of damaged bones, decreasing mechanical properties, and low potential.

Active Publication Date: 2021-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnesium standard electrode potential is low (-2.36V sce ), and its corrosion products are loose and porous (PBR=0.81), so the degradation rate in the human body is too fast
This will result in excessive magnesium ion concentration, excessive hydrogen release, and subcutaneous emphysema. At the same time, rapid degradation will lead to a rapid decline in mechanical properties, which will easily fail before the bone tissue heals, affecting the growth and healing of damaged bones.

Method used

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  • A method for preparing needle-like second phases to improve the degradation resistance of medical magnesium alloys
  • A method for preparing needle-like second phases to improve the degradation resistance of medical magnesium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 9.88 grams of AZ61 powder (particle size 50-80 μm) and 0.12 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 90W, the scanning speed is 300mm / min, and the spot diameter is 80μm.

[0028] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 The precipitation of the second phase ( figure 1 ). Electrochemical tests found that, compared with the AZ61 alloy, the needle-like Al 4 The corrosion current of Ce-phase magnesium alloy is 40.91μA / cm from AZ61 2...

Embodiment 2

[0030] Weigh 9.88 grams of AZ61 powder (particle size 50-80 μm) and 0.12 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 70W, the scanning speed is 300mm / min, and the spot diameter is 80μm.

[0031] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 Precipitation of the second phase. Electrochemical tests found that, compared with the AZ61 alloy, the corrosion current of the magnesium alloy containing the needle-like Al4Ce phase increased from 40.91μA / cm 2 Red...

Embodiment 3

[0033] Weigh 9.76 grams of AZ61 powder (particle size 50-80 μm) and 0.24 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 90W, the scanning speed is 300mm / min, and the spot diameter is 80μm.

[0034] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 Precipitation of the second phase. Electrochemical tests found that, compared with the AZ61 alloy, the needle-like Al 4 The corrosion current of Ce-phase magnesium alloy is 40.91μA / cm from AZ61 2 Reduced to 22.34μ...

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Abstract

The invention relates to a method for preparing acicular second phases to improve the degradation resistance of medical magnesium alloys. The magnesium alloy includes an AZ61 matrix and acicular Al uniformly distributed in the matrix 4 Ce phase. Its preparation method is as follows: ball milling Ce powder and AZ61 powder to obtain mixed powder, and then preparing acicular Al-containing powder by SLM 4 Ce phase magnesium alloy. On the one hand, the present invention can significantly refine matrix grains and acicular Al 4 The Ce phase structure, on the other hand, increases the solid solubility of solute elements and inhibits Mg 17 Al 12 Precipitation of the second phase. Acicular Al 4 The Ce phase has both a smaller potential difference and a larger resistance to the matrix, which can inhibit galvanic corrosion; and the Al 4 The Al in the alloy is consumed during the formation of Ce, which can also reduce and refine the original Mg in the alloy 17 Al 12 Phase, thereby reducing galvanic corrosion, the two work together to improve the degradation resistance of magnesium alloys, thereby promoting its application in degradable implants.

Description

technical field [0001] The invention belongs to the technical field of medical alloy preparation, and in particular relates to a method for preparing acicular second phases to improve the degradation resistance of medical magnesium alloys. Background technique [0002] Magnesium alloy density (1.75g / cm 3 ) is very similar to human compact bone density, and the elastic modulus (40-45GPa) of magnesium alloy is relatively close to that of human bone (10-40GPa). Avoid the "stress shielding effect"; at the same time, as an implant material, it can be gradually degraded in the body, avoiding the pain caused by the second surgery; and during the degradation process, the magnesium released by the magnesium alloy is an essential trace element for the human body, which can Participate in bone mineral metabolism, promote the proliferation and differentiation of bone cells, and promote bone growth and healing. Therefore, magnesium alloys have broad application prospects in bone repair...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00B22F3/105C22C23/02
CPCB22F9/04C22C23/02B22F2009/043B22F10/00B22F1/052B22F10/36B22F10/28B22F10/366Y02P10/25
Inventor 高成德帅词俊王丽
Owner CENT SOUTH UNIV
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