Method of preparing needle-shaped second phase for improving degradation resistance of medical magnesium alloy

A magnesium alloy and needle-shaped technology, which is applied in the field of preparing the needle-shaped second phase to improve the degradation resistance of medical magnesium alloys, can solve the problems of affecting the growth and healing of damaged bones, the decline of mechanical properties, and the fast degradation speed, etc. Corrosion, good resistance to degradation, effect of improving resistance to degradation

Active Publication Date: 2020-01-24
CENT SOUTH UNIV
View PDF7 Cites 0 Cited by
  • 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, e

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of preparing needle-shaped second phase for improving degradation resistance of medical magnesium alloy
  • Method of preparing needle-shaped second phase for improving degradation resistance of medical magnesium alloy

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Corrosion currentaaaaaaaaaa
Corrosion currentaaaaaaaaaa
Corrosion currentaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method of preparing a needle-shaped second phase for improving degradation resistance of a medical magnesium alloy. The magnesium alloy includes an AZ61 matrix and needle-shaped Al4Ce phases uniformly distributed in the matrix. The preparation method includes the steps that Ce powder and AZ61 powder are subjected to ball milling to obtain mixed powder, and then the magnesium alloy containing the needle-shaped Al4Ce phases is prepared by SLM. According to the method, on the one hand, matrix grains and the needle-shaped Al4Ce phase structures can be obviously refined,on the other hand, the solid solubility of solute elements is increased, and precipitation of the second phase of Mg17Al12 is inhibited; the formed needle-shaped Al4Ce phases have both smaller potential differences and greater resistance from the matrix, and galvanic corrosion can be inhibited; and during formation of Al4Ce, Al in the alloy is consumed, an original Mg17Al12 phase in the alloy canalso be reduced and refined, thus galvanic corrosion is reduced, degradation resistance of the magnesium alloy is improved through combined action of the two effects, and thus application of the magnesium alloy to degradable implantation materials is promoted.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap