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Biodegradable ultra-fine grain Zn-Li alloy material as well as preparation method and application thereof

An alloy material and ultra-fine grain technology, applied in the field of biodegradable metal materials, can solve the problems of poor comprehensive mechanical properties of pure zinc, unsatisfactory strength and ductility, etc., to improve comprehensive mechanical properties, controllable degradation rate, avoid The effect of secondary surgery

Pending Publication Date: 2021-06-22
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive mechanical properties of pure zinc are relatively poor: both strength and ductility cannot meet the standards of implant materials (yield strength > 200MPa, tensile strength > 300MPa, elongation > 15-18%)

Method used

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  • Biodegradable ultra-fine grain Zn-Li alloy material as well as preparation method and application thereof
  • Biodegradable ultra-fine grain Zn-Li alloy material as well as preparation method and application thereof
  • Biodegradable ultra-fine grain Zn-Li alloy material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation and property testing of Zn-0.5Li alloy. The mass fraction of Li in the Zn-0.5Li alloy is 0.5%, and the balance is Zn. The alloy preparation process is smelting→casting→hot extrusion→multi-pass drawing at room temperature. The specific method is: weighing the corresponding ratio of pure zinc and Zn-Li master alloy into a crucible, and melting in an induction melting furnace. Heat the Zn-Li master alloy and 90% pure zinc to 600°C, keep it warm for about 5 minutes, and stir evenly. After it is completely melted, add the remaining 10% pure zinc, and stir to remove the slag after it is completely melted. Pour the above-mentioned cast zinc alloy into a cylindrical casting mold preheated at 500°C, and air-cool to room temperature (25°C). Put the cylindrical cast zinc alloy taken out from the mold and the extrusion mold into a box furnace and heat to 260° C., keep it warm for 2 hours, and extrude it to a bar with a hydraulic press, with an extrusion ratio of 20. ...

Embodiment 2

[0031] Preparation and performance test of Zn-0.05Li alloy. The mass fraction of Li in the Zn-0.05Li alloy is 0.05%, and the balance is Zn. The alloy preparation process is smelting→casting→hot extrusion→multi-pass rotary forging at room temperature. The specific method is: weighing the corresponding ratio of pure zinc and Zn-Li master alloy into a crucible, and melting in an induction melting furnace. Heat the Zn-Li master alloy and 90% pure zinc to 550°C, keep it warm for about 5 minutes, and stir evenly. After it is completely melted, add the remaining 10% pure zinc, and stir to remove the slag after it is completely melted. Pour the above-mentioned cast zinc alloy into a cylindrical casting mold preheated at 520°C, and air-cool to room temperature (25°C). Put the cylindrical cast zinc alloy taken out from the mold and the extrusion mold into a box furnace and heat to 250° C., keep it warm for 2 hours, and extrude it to a rod with a hydraulic press, and the extrusion rati...

Embodiment 3

[0033]Preparation and performance test of Zn-1Li alloy. The mass fraction of Li in the Zn-1Li alloy is 1%, and the balance is Zn. The alloy preparation process is smelting→casting→hot extrusion→multi-pass rotary forging at room temperature. The specific method is: weighing the corresponding ratio of pure zinc and Zn-Li master alloy into a crucible, and melting in an induction melting furnace. Heat the Zn-Li master alloy and 90% pure zinc to 580°C, keep it warm for about 5 minutes, and stir evenly. After it is completely melted, add the remaining 10% pure zinc, and stir to remove the slag after it is completely melted. Pour the above-mentioned cast zinc alloy into a cylindrical casting mold preheated at 550°C, and air-cool to room temperature (25°C). The cylindrical cast zinc alloy taken out of the mold and the extrusion mold are put into a box furnace and heated to 300° C., kept for 2 hours, and extruded to a rod by a hydraulic press with an extrusion ratio of 20. Then carr...

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Abstract

The invention discloses a biodegradable ultra-fine grain Zn-Li alloy material as well as a preparation method and application thereof. The mechanical property of the biodegradable ultra-fine grain Zn-Li alloy material is improved through adding of the Li element and multi-pass deformation processing. The strengthening effect of the Li element on the zinc alloy is most obvious mainly depending on the pinning effect of the intermediate phase LiZn4. The multi-pass deformation processing is mainly performed through the grain refinement effect. The zinc alloy in the invention can be naturally degraded in the human body, meanwhile, the degradation rate is controllable, the zinc alloy can naturally disappear from the human body after the medical effect is achieved, and a secondary operation is avoided. Besides, zinc is one of trace elements necessary for the human body, and degradation products of zinc are harmless to the human body. The Zn-Li intermediate alloy is added into the zinc alloy, and the structure of the alloy can be further optimized by regulating and controlling the content of the Li element, so that the comprehensive mechanical property and the biocompatibility of the zinc alloy are improved, and the corrosion rate of the zinc alloy can be properly regulated and controlled.

Description

technical field [0001] The invention belongs to the field of biodegradable metal materials, and in particular relates to a biodegradable ultrafine-grained Zn-Li alloy material and a preparation method. Background technique [0002] Biodegradable metal materials refer to metal materials that can be gradually absorbed or dissolved after being implanted in the body. Therefore, it is required to obtain the expected degradation rate while having good biocompatibility; under the premise of ensuring the mechanical integrity of the material, it can be completely absorbed or dissolved at an appropriate time. Iron-based and magnesium-based composites are currently widely studied biodegradable biometallic materials, and they have the following characteristics: Iron-based composites have excellent mechanical properties, but the degradation rate is too slow and the degradation is not complete. At the same time, the inability to carry out nuclear magnetic resonance is also a disadvantage...

Claims

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Application Information

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IPC IPC(8): C22C18/00A61L27/04C22C1/03
CPCC22C18/00C22C1/03A61L27/047
Inventor 邓龙宋振纶杨丽景李凤仙朱兴隆史义轩
Owner KUNMING UNIV OF SCI & TECH
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