Biological magnesium alloy with corrosion resistant function and preparation method thereof

A magnesium alloy and corrosion-resistant technology, applied in the field of biomedical material preparation, can solve problems such as delaying the contact time between magnesium alloy and body fluid, and achieve the effects of avoiding galvanic corrosion effect, improving corrosion resistance, and uniform and fine microstructure.

Inactive Publication Date: 2018-02-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing research is limited to applying GO as a surface coating or coating additive to bio-magnesium alloys. The surface coating can only protect bio-magnesium alloys from corrosion and degradation at the initial stage of implantation, which temporarily delays the contact time of magnesium alloys with body fluids. , and after the coating cracks and falls off, the magnesium alloy substrate loses protection and will still degrade rapidly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using GO powder and Mg-3Al-1Zn alloy powder as raw materials, weigh 0.1g of GO powder (0.8-1.2nm in thickness, 8-15 microns in diameter) and 9.9g of Mg-3Al-1Zn alloy powder in a mass ratio of 1:99 , respectively placed in two 1L beakers, slowly added 250ml of absolute ethanol, and ultrasonically stirred at a speed of 250rad / min for 4h to obtain a GO suspension and a Mg-3Al-1Zn suspension, and the GO suspension was slowly added to Mg - In the 3Al-1Zn suspension, continue to ultrasonically stir at a speed of 250 rad / min for 4 hours to obtain a GO / Mg-3Al-1Zn suspension, which is vacuum filtered and dried for 24 hours (drying temperature is 80-90°C), A uniformly dispersed GO / Mg-3Al-1Zn mixed powder was obtained. GO / Mg-3Al-1Zn alloy was prepared by SLM process under the conditions of 99.999% high-purity argon protection, atmosphere pressure of 5 MPa, spot diameter of 100 μm, laser power of 80 W, and scanning speed of 200 mm / min.

[0030]The test found that GO can keep the s...

Embodiment 2

[0032] Using GO powder (0.8-1.2nm in thickness, 8-15 microns in diameter) and Mg-3Al-1Zn alloy powder as raw materials, weigh 0.08g of GO powder and 9.92g of Mg-3Al-1Zn alloy powder at a mass ratio of 0.8:99.2 , respectively placed in two 1L beakers, slowly added 250ml of absolute ethanol, and ultrasonically stirred at a speed of 250rad / min for 4h to obtain a GO suspension and a Mg-3Al-1Zn suspension, and the GO suspension was slowly added to Mg In the 3Al-1Zn suspension, continue to stir ultrasonically at a speed of 250 rad / min for 4 hours to obtain a GO / Mg-3Al-1Zn suspension. After vacuum filtration and drying for 24 hours, a uniformly dispersed GO / Mg-3Al -1Zn mixed powder. GO / Mg-3Al-1Zn alloy was prepared by SLM process under the conditions of 99.999% high-purity argon protection, atmosphere pressure of 5 MPa, spot diameter of 100 μm, laser power of 80 W, and scanning speed of 200 mm / min.

[0033] The test found that GO can wrap Mg-3Al-1Zn alloy grains to form the second p...

Embodiment 3

[0035] Using GO powder (0.8-1.2nm in thickness, 8-15 microns in diameter) and Mg-3Al-1Zn alloy powder as raw materials, weigh 0.12g of GO powder and 9.88g of Mg-3Al-1Zn alloy at a mass ratio of 1.2:98.8 Put the powder into two 1L beakers respectively, slowly add 250ml of absolute ethanol, and ultrasonically stir at a speed of 250rad / min for 4h to obtain a GO suspension and a Mg-3Al-1Zn suspension, slowly add the GO suspension In the Mg-3Al-1Zn suspension, the GO / Mg-3Al-1Zn suspension was obtained by continuing to ultrasonically stir at a speed of 250 rad / min for 4 hours. After vacuum filtration and drying for 24 hours, a uniformly dispersed GO / Mg- 3Al-1Zn mixed powder. GO / Mg-3Al-1Zn alloy was prepared by SLM process under the conditions of 99.999% high-purity argon protection, atmosphere pressure of 5.1MPa, spot diameter of 120μm, laser power of 80W, and scanning speed of 250mm / min.

[0036] The test found that GO can wrap Mg-3Al-1Zn alloy grains to form the second phase of n...

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Abstract

The invention discloses biological magnesium alloy with a corrosion resistant function. The biological magnesium alloy is prepared from a biological magnesium alloy matrix and graphene oxide, whereinthe graphene oxide is distributed on the grain boundary of the biological magnesium alloy matrix, and the graphene oxide wraps biological magnesium alloy grains so as to form a second phase of a nanohoneycomb structure. The invention further discloses a preparation method. The preparation method comprises the following steps of (1) respectively putting GO powder and biological magnesium alloy powder in absolute ethyl alcohol according to the design proportion for ultrasonic agitation so as to obtain a GO suspension and a biological magnesium alloy suspension; (2) slowly adding the GO suspension to the biological magnesium alloy suspension, continuing to perform ultrasonic agitation so as to obtain a mixed suspension, and performing vacuum filtration and drying treatment on the mixed suspension so as to obtain mixed powder with uniform dispersion; and (3) performing selective laser melting on the mixed powder in the protective atmosphere so as to prepare the biological magnesium alloywith the corrosion resistant function. According to the biological magnesium alloy with the corrosion resistant function, the second phase of the nano honeycomb structure constructed by utilizing GO can be used as a shield so as to isolate the biological magnesium alloy from body fluid, so that a galvanic corrosion effect of a conventional second phase is avoided, and the corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of biomedical material preparation, and in particular relates to a biomagnesium alloy with corrosion resistance function and a preparation method thereof. Background technique [0002] In recent years, bio-magnesium alloys have attracted more and more attention in the fields of bone tissue engineering scaffolds and orthopedic fixtures due to their excellent biocompatibility and similar density and elastic modulus to human bones. As a metal material, bio-magnesium alloys have higher strength than polymer materials and better toughness than ceramic materials. Compared with traditional medical metals such as stainless steel and titanium alloys, the biggest advantage of bio-magnesium alloys is that they can be used in the human body. Completely degraded; at the same time, magnesium ion is the fourth most abundant cation in the human body, which is involved in almost all metabolic processes and can promote bone r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02
CPCC22C1/02C22C23/00
Inventor 高成德帅词俊
Owner CENT SOUTH UNIV
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