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High-toughness medical biodegradable zinc alloy based on ultrafine three-phase eutectic structure reinforcement and preparation method thereof

A technology of eutectic structure and zinc alloy, which is applied in the field of high-strength medical biodegradable zinc alloy and its preparation, can solve the problems of limiting the application potential of degradable metals and poor mechanical properties of zinc-based alloys, and improve corrosion and degradation behavior , enhance the strengthening effect, improve the effect of toughness

Pending Publication Date: 2020-04-17
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, as metals with a hexagonal structure, the mechanical properties of Zn-based alloys are relatively poor, which limits their application potential as degradable metals.

Method used

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  • High-toughness medical biodegradable zinc alloy based on ultrafine three-phase eutectic structure reinforcement and preparation method thereof
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Effect test

Embodiment 1

[0022] The pure zinc ingots and pure magnesium ingots required for the Zn-0.3wt%Mg alloy were placed in CO 2 and SF 6 Melting was carried out under the protection of a mixed atmosphere (99:1), followed by controlled casting at a cooling rate of 600°C / s to obtain a Zn-0.3wt%Mg zinc alloy ingot with a three-phase eutectic structure. Cut a rectangular parallelepiped or cylindrical billet from the above-mentioned zinc alloy ingot, and perform multi-pass equal-channel angular extrusion processing. The temperature of the equal-channel angular extrusion processing is 150 ° C, and the number of passes for the equal-channel angular extrusion processing is 16. Subsequently, a high-strength and tough medical biodegradable zinc alloy with ultra-fine tissue was obtained.

Embodiment 2

[0024] The pure zinc ingots and pure magnesium ingots required for the Zn-1.0wt%Mg alloy were placed in CO 2 and SF 6 Melting was carried out under the protection of a mixed atmosphere (99:1), followed by controlled casting at a cooling rate of 700°C / s to obtain a Zn-1.0wt%Mg zinc alloy ingot with a three-phase eutectic structure. Cut a rectangular parallelepiped or cylindrical billet from the above-mentioned zinc alloy ingot, and perform multi-pass equal-channel angular extrusion processing. The temperature of the equal-channel angular extrusion processing is 200 ° C, and the number of equal-channel angular extrusion processing is 12. Subsequently, a high-strength and tough medical biodegradable zinc alloy with ultra-fine tissue was obtained.

Embodiment 3

[0026] In CO 2 and SF 6 Melting was carried out under the protection of a mixed atmosphere (99:1), followed by controlled casting at a cooling rate of 800°C / s to obtain a Zn-1.2wt%Mg zinc alloy ingot with a three-phase eutectic structure. Cut a rectangular parallelepiped or cylindrical billet from the above-mentioned zinc alloy ingot, and perform multi-pass equal-channel angular extrusion processing. The temperature of the equal-channel angular extrusion processing is 250 ° C, and the number of passes for the equal-channel angular extrusion processing is 8. Subsequently, a high-strength and tough medical biodegradable zinc alloy with ultra-fine tissue was obtained.

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Abstract

The invention discloses a high-toughness medical biodegradable zinc alloy based on ultrafine three-phase eutectic structure reinforcement and a preparation method thereof. The preparation method comprises the following steps of A, smelting a pure zinc ingot and a pure magnesium ingot under CO2 and SF6 mixed atmosphere protection, and then controlling casting (the cooling speed is 600-800 DEG C / s)to obtain a zinc alloy ingot having three-phase eutectic structures, wherein the content of the Mg element is 0.3 wt%-1.2 wt%, and the balance is Zn; and B, cutting a cuboid or cylindrical blank fromthe zinc alloy ingot, conducting 8-16 pass equal-channel angular extrusion machining at the temperature of 150-250 DEG C, and obtaining high-toughness medical biodegradable zinc alloy having ultra-fine structures. According to the high-toughness medical biodegradable zinc alloy, on the basis of the formed special three-phase eutectic structures, further crushing and refining are carried out through violent plastic processing, the synergistic strengthening effect of fine grain strengthening and multi-size and multi-component strengthening is brought into full play, the strength and toughness ofthe zinc-based alloy are remarkably improved, and meanwhile the corrosion behavior of the zinc-based alloy is improved.

Description

technical field [0001] The invention relates to a high-strength and tough medical biodegradable zinc alloy reinforced by an ultrafine three-phase eutectic structure and a preparation method thereof, belonging to the technical field of degradable metal processing. Background technique [0002] Compared with traditional non-degradable (inert) medical metal materials, such as stainless steel, titanium-based alloys, cobalt-based alloys, and nickel-chromium alloys, biodegradable metals have outstanding advantages, including: (1) good biocompatibility; (2) Biodegradability, it can be completely degraded in the body after completing its service, and the degradation products have no side effects on the human body; (3) No need for secondary surgery to remove after implanting in the body, which reduces the pain of patients and reduces the secondary Risks and medical costs of surgery. Therefore, after entering the 21st century, biodegradable metals have been favored by many material r...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C18/00C22F1/16
CPCC22C1/02C22C18/00C22F1/165
Inventor 刘欢孙超黄河任康轩江静华马爱斌
Owner HOHAI UNIV
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