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Warm pressing deformation biological magnesium alloy and preparation method thereof

A magnesium alloy and warm pressing technology is applied in the field of warm pressing deformation biological magnesium alloy and its preparation, which can solve the problems of reduced corrosion resistance of the alloy, reduced corrosion resistance of the alloy, coarse grains of the magnesium alloy, etc., and achieves uniform grain size. Small, improved molding rate, good biocompatibility

Active Publication Date: 2017-08-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, alloying is the main means to improve the mechanical properties of magnesium alloys. Most deformed magnesium alloys obtain good strength and plasticity by adding elements such as Y, Nd, and Zr. The tensile mechanical properties at room temperature still need to be improved, especially to further increase the strength on the basis of maintaining good plasticity
At the same time, the alloying deformed magnesium alloy will lead to a large difference between the second phase potential and the matrix, resulting in a decrease in the corrosion resistance of the alloy
[0004] Magnesium alloy grains are coarse, and usually the matrix potential of the alloy is low and the potential of the second phase is high. During the corrosion process of the alloy, the matrix acts as the anode, and the second phase acts as the cathode. The corrosion of the alloy starts from the inside of the large grain (matrix) starts, and gradually advances to the interior of the alloy, thereby greatly reducing the corrosion resistance of the alloy

Method used

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  • Warm pressing deformation biological magnesium alloy and preparation method thereof
  • Warm pressing deformation biological magnesium alloy and preparation method thereof
  • Warm pressing deformation biological magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mg-6Zn-0.5Mn-0.3Gd warm-press deformation biological magnesium alloy, the preparation method is:

[0031] 1) Prepare as-cast Mg-6Zn-0.5Mn-0.3Gd alloy masterbatch samples according to the nominal weight percentage of each element;

[0032] 2) Put the sample in step 1) at room temperature for natural aging for 150 hours, then move it into a box-type resistance furnace, keep it at 320°C for 15 hours, and then cool it with the furnace;

[0033] 3) Heat the sample treated in step 2) to 220°C for extrusion pretreatment, and then put it into a 1000T forward extrusion machine. The furnace chamber temperature of the extruder is 320°C. The upsetting ratio is 0.5, and then extrusion is carried out, the extrusion ratio is 13, the extrusion speed is 133mm / s, and the sample is extruded into a round bar with a diameter of 30mm;

[0034] 4) The sample extruded into a round bar in step 3) was subjected to aging treatment, the aging treatment was 180°C for 24 hours, and air cooling to o...

Embodiment 2

[0037] Mg-4.5Zn-0.8Mn-0.5Gd warm-press deformation biological magnesium alloy, the preparation method is:

[0038] 1) Prepare as-cast Mg-4.5Zn-0.8Mn-0.5Gd alloy masterbatch samples according to the nominal weight percentage of each element;

[0039] 2) Put the sample in step 1) at room temperature for natural aging for 180 hours, then move it into a box-type resistance furnace, keep it at 340°C for 12 hours, and then cool it with the furnace;

[0040]3) Heat the sample treated in step 2) to 240°C for extrusion pretreatment, and then put it into a 1000T forward extrusion machine. The furnace chamber temperature of the extruder is 320°C, and upset the sample first. The upsetting ratio is 0.5, and then extrusion is carried out, the extrusion ratio is 13, the extrusion speed is 133mm / s, and the sample is extruded into a round bar with a diameter of 30mm;

[0041] 4) The sample extruded into a round bar in step 3) was subjected to aging treatment, the aging treatment was 200°C for...

Embodiment 3

[0044] Mg-4Zn-1Mn-0.6Gd warm-press deformation biological magnesium alloy, the preparation method is:

[0045] 1) Prepare as-cast Mg-4Zn-1Mn-0.6Gd alloy masterbatch samples according to the nominal weight percentage of each element;

[0046] 2) Put the sample in step 1) at room temperature for natural aging for 160 hours, then move it into a box-type resistance furnace, keep it at 350°C for 18 hours, and then cool it with the furnace;

[0047] 3) Heat the sample treated in step 2) to 200°C for extrusion pretreatment, and then put it into a 1000T forward extruder. The temperature of the furnace chamber of the extruder is 320°C. The upsetting ratio is 0.6, and then extrusion is performed, the extrusion ratio is 15, the extrusion speed is 160mm / s, and the sample is extruded into a round bar with a diameter of 33mm;

[0048] 4) The sample extruded into a round rod in step 3) was subjected to aging treatment, and the aging treatment was 160°C for 36 hours, and air cooling to obtai...

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Abstract

The invention relates to a warm pressing deformation biological magnesium alloy and a preparation method thereof. The warm pressing deformation biological magnesium alloy is composed of, by mass, 0.1-6.5% of Zn, 0.1-1.8% of Mn, 0.1-1.2% of Gd and the balance Mg. The preparation method of the biological magnesium alloy comprises the steps that as-cast magnesium alloy according with the composition proportion is subjected to a series of pre-treatment operations before being pressed, and is put into an extrusion machine for first upsetting when the temperature of a sample is lower than the recrystallization temperature, then warm pressing is conducted, the sample temperature of warm pressing is 150-250 DEG C, and the warm pressing speed is 130-200 mm / s; and after warm pressing is completed, a series of subsequent heat treatment operations are carried out on the alloy, and the warm pressing deformation biological magnesium alloy is prepared. According to the magnesium alloy, crystal particles are fine and uniform, excellent physical performance and corrosion resistance are achieved, the problems that magnesium alloy is low in intensity and plasticity and too high in degradation velocity when in human bodies can be effectively solved, the number of degradation products of the alloy is small, the pre-pressure can be discharged out of the human bodies in time and cannot cause toxicity to the human bodies, and the alloy can be applied to medical fields such as bone lamellas, bone nails and cardiovascular stents.

Description

technical field [0001] The invention relates to the field of biomedical magnesium alloys, in particular to a warm-press deformed bio-magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys have attracted more and more attention due to their degradable properties in the body. The magnesium ions produced by its degradation are indispensable ions in the metabolism process of human growth and development. In addition, magnesium alloys also have an elastic modulus similar to that of human bone, and Due to its excellent biocompatibility, it is of great significance to study the degradation mechanism of magnesium alloy biological components in the human body. The standard electrode potential of magnesium is -2.37V. Compared with titanium alloys and cobalt-chromium alloys, magnesium alloys have poor corrosion resistance, and the corrosion mode in the human body environment is in the form of pitting corrosion, resulting in perforation of compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/00C22C23/06C22F1/06
CPCC22C23/00C22C23/04C22C23/06C22F1/06
Inventor 徐淑敏滕新营丁奕均刘飞葛行敬
Owner UNIV OF JINAN
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