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Degradable, high-toughness and ultrafine-grained magnesium-zinc rare earth alloy used for bone fixation and method for preparing same

A technology of rare earth alloys and ultra-fine crystals, which is applied in the field of bioalloy processing and can solve problems such as poor biocorrosion resistance

Inactive Publication Date: 2012-10-10
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to develop a biodegradable high-strength ultrafine-grain magnesium-zinc rare earth alloy material for bone fixation, and at the same time provide a large deformation equal-diameter channel angular extrusion suitable for this material with simple process operation and equipment requirements Processing method, thereby significantly improving the strength and toughness of the alloy without changing the shape and size of the as-cast alloy specimen, and solving the problem of poor biocorrosion resistance, and improving its yield

Method used

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  • Degradable, high-toughness and ultrafine-grained magnesium-zinc rare earth alloy used for bone fixation and method for preparing same
  • Degradable, high-toughness and ultrafine-grained magnesium-zinc rare earth alloy used for bone fixation and method for preparing same

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Embodiment 1

[0016] The magnesium-zinc rare earth alloy ingot is smelted according to the designed composition, and its composition and weight percentage are Zn 3.7%, rare earth elements 1.5%, Zr7 Zn 3 (RE), REMg 12 phase composition (see figure 1 (a)), the average size of microscopic grains is about 60 μm. The as-cast magnesium-zinc rare earth alloy is processed into a columnar specimen of 19.5mm×19.5mm×40mm by wire cutting, and the cut specimen is subjected to surface pretreatment, and then placed in an equal-diameter channel corner mold and heated to 330°C with the furnace Keep warm for 10 minutes, and then apply pressure to carry out 60 consecutive equal-diameter channel angular extrusions. The sample is rotated 180° between adjacent extrusion passes (that is, the traditional C path) to improve the uniformity of the extrusion structure. After processing, the alloy structure Significant refinement (see figure 1(b)), the average size of the microscopic grains is less than 1.5 μm, an...

Embodiment 2

[0018] The magnesium-zinc rare earth alloy ingot is smelted according to the designed composition, and its composition and weight percentage are Zn 4.5%, rare earth element 1.0%, Zr figure 2 ), and its initial incubation period is measured to be longer (the hydrogen evolution rate is about 0.022ml / (cm 2 .h), converted into a degradation rate of about 0.011 mm / a), then enters a stable stage through a rapid corrosion stage, and the hydrogen evolution rate is only 0.050 ml / (cm 2 .h), and the corresponding degradation rate is about 0.026 mm / a, which can meet the requirements of biocorrosion resistance as a biodegradable medical magnesium alloy for bone fixation.

Embodiment 3

[0020] The magnesium-zinc rare earth alloy ingot is smelted according to the designed composition, and its composition and weight percentage are Zn 4.1%, rare earth elements 1.2%, Zr2 .h), the converted degradation rate is about 0.010mm / a), and then enters the stable stage through the rapid corrosion stage. After stabilization, the hydrogen evolution rate is only 0.075 ml / (cm 2 .h), and the corresponding degradation rate is about 0.038 mm / a, which can meet the requirements of biocorrosion resistance as a biodegradable medical magnesium alloy for bone fixation.

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Abstract

The invention discloses a degradable, high-toughness and ultrafine-grained magnesium-zinc rare earth alloy used for bone fixation and a method for preparing the same by using an equal channel angular pressing technology with large deflection. The method comprises casting an ingot by using a magnesium-zinc rare earth alloy comprising 3.7 to 4.5 % of Zn, 1.0 to 1.5 % of rare earth elements, less than 0.5 % of Zr, less than 0.10 % of Mn, less than 0.01 % of Ni and the balance being Mg; cutting the ingot into cylindrical test pieces in accordance with channel sizes of an extrusion die; removing surface oil and oxide-film by conventional pre-treatment; and putting test pieces into equal channel die to heat with the furnace to 330 DEG C and then insulating, and continuously performing the equal channel angular pressing for more than and equal to 8 passes, with the test pieces rotating 180 DEG between adjacent passes. In the abovementioned way, the prepared magnesium-zinc rare earth alloy has an average microscopic grain size of less than 1.5 [mu]m, has advantages of good biocompatibility, high toughness, corrosion resistance and completely degradation in vivo, and can be used as degradable bone-fixation materials implanted in short-term, such as bone plate, bone nail and the like. The method provided by the invention is high in yield and simple in technology operation and equipment requirement, and had good prospects for industrial application.

Description

1. Technical field [0001] The invention relates to a degradable high-strength and tough ultra-fine-grain magnesium-zinc rare earth alloy material for bone fixation and a preparation method thereof by equal-diameter channel angular extrusion with large deformation, and belongs to the technical field of biological alloy processing. 2. Background technology [0002] Magnesium alloy has excellent and unique physical, chemical and mechanical properties, its specific stiffness and specific strength are the highest among all metal materials, and it also has good biocompatibility, and can be automatically degraded in the living body, as a biodegradable biomedical metal Implant materials have great potential and broad application prospects. Realizing the biomedical application research of magnesium alloy with controllable degradability will create immeasurable value for human beings. So far, the research on medical magnesium alloys is still mainly focused on the degradation characte...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22F1/06
Inventor 江静华宋丹马爱斌张凡陈建清杨东辉
Owner HOHAI UNIV
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