A kind of magnesium alloy with self-generated gradient structure and its preparation method and application

A gradient structure, magnesium alloy technology, applied in the direction of prosthesis, medical science, etc., can solve the problems of easy peeling and coating, uneven coating, etc., to extend the mechanical integrity time, improve corrosion resistance, and achieve good medical effects. Effect

Active Publication Date: 2020-12-15
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a magnesium alloy with a self-generated gradient structure, which solves the problems that the external coating is easy to fall off and the coating is uneven

Method used

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  • A kind of magnesium alloy with self-generated gradient structure and its preparation method and application
  • A kind of magnesium alloy with self-generated gradient structure and its preparation method and application
  • A kind of magnesium alloy with self-generated gradient structure and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1: Preparation of a Mg-Si-based magnesium alloy with an autogenous gradient structure with a Si content of 5% by weight.

[0039] Take high-purity magnesium (purity greater than 99.99%) and high-purity silicon (purity greater than 99.99%), mix according to the mass ratio of Mg and Si at a ratio of 95:5, and control the content of impurity elements to less than 0.1%. Put the two raw materials into the smelting furnace for smelting. During the smelting process, argon is used as a protective gas, and the temperature is raised to 820°C to make the ingredients uniform and the raw materials are fully melted. During the heating process, electromagnetic induction stirring is applied. After the raw materials are completely melted, the temperature is lowered to 720°C and kept for 15 minutes. The speed is directed to pull away from the heating coil, so that the surface layer of the bottom and the surface layer of the side of the magnesium alloy form a corrosion-resistant l...

Embodiment 2

[0040] Example 2: A Mg-Si-based magnesium alloy with an autogenous gradient structure with a Si element content of 7% by weight was prepared.

[0041] Take high-purity magnesium (purity greater than 99.99%) and high-purity silicon (purity greater than 99.99%), mix according to the mass ratio of Mg and Si of 93:7, and control the content of impurity elements to less than 0.1%. Put the two raw materials into the smelting furnace for smelting. During the smelting process, argon is used as a protective gas, and the temperature is raised to 860°C to make the ingredients uniform and the raw materials are fully melted. During the heating process, electromagnetic induction stirring is applied. After the raw materials are completely melted, the temperature is lowered to 750°C and kept for 20 minutes. The speed is directed to pull away from the heating coil, so that the surface layer of the bottom and the surface layer of the side of the magnesium alloy form a corrosion-resistant layer ...

Embodiment 3

[0042] Example 3: A Mg-Si-based magnesium alloy with an autogenous gradient structure with a Si element weight percentage of 9.9% was prepared.

[0043] Take high-purity magnesium (purity greater than 99.99%) and high-purity silicon (purity greater than 99.99%), mix according to the mass ratio of Mg and Si at a ratio of 90.1:9.9, and control the content of impurity elements to less than 0.1%. Put the two raw materials into the smelting furnace for smelting. During the smelting process, argon is used as a protective gas, and the temperature is raised to 900°C to make the ingredients uniform and the raw materials are fully melted. During the heating process, electromagnetic induction stirring is applied. After the raw materials are completely melted, the temperature is lowered to 780°C and kept for 25 minutes. Pull away from the heating coil at a directional speed, so that the surface layer of the bottom and the surface layer of the side of the magnesium alloy form a corrosion-r...

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Abstract

The invention discloses a magnesium alloy having an authigenic gradient structure and a preparation method and application thereof. The magnesium alloy having an authigenic gradient structure is mainly composed of two elements of Mg and X. The preparation method comprises: according to the component ratio, placing raw materials in a heat-resistant container; under a protective atmosphere, heatingthe heat-resistant container, and cooling and standing for heat preservation after the raw materials are all melted into melt; cooling the specified part of the melt to control the inside and the surface of the melt to generate a temperature gradient, so that the second phase with a high melting point is firstly solidified and aggregated on the surface of an ingot to form a corrosion-resistant layer, and then the Mg matrix with a low melting point is solidified; and cooling the ingot to obtain the magnesium alloy material having an authigenic gradient structure. The invention also discloses the application of the magnesium alloy having an authigenic gradient structure to the biomedical field. According to the magnesium alloy having an authigenic gradient structure, the corrosion-resistantlayer is formed on the surface layer due to the aggregation of the second phase, thereby reducing the corrosion rate of the magnesium alloy and meeting the corrosion resistance requirements of the medical magnesium alloy.

Description

technical field [0001] The invention relates to the field of magnesium alloy preparation, in particular to a magnesium alloy with self-generated gradient structure and its preparation method and application. Background technique [0002] Metal hard tissue implant materials such as medical stainless steel, nickel-cobalt-chromium alloy and titanium alloy have been successfully applied clinically, especially in the treatment of damaged bone tissue. However, these metals will release toxic metal ions after implantation in the body, which may lead to poor biocompatibility and severe inflammatory response causing tissue damage. The elastic modulus of these metal implants is quite different from that of natural bone, which will lead to stress shielding effect and reduce the stress stimulation necessary for new bone growth and reconstruction, thereby affecting the reliability of the implant. Furthermore, the corrosion of metal implant materials by body fluids is unavoidable. Althou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02A61L27/04A61L27/50A61L27/58
Inventor 王敬丰蒋伟燕余文轴刘青山刘秀英
Owner CHONGQING UNIV
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