Method for preparing magnesium alloy material

A magnesium alloy and alloy technology, applied in the field of preparation of magnesium alloy materials, can solve problems such as easy coarsening, unsatisfactory mechanical properties and corrosion resistance at room temperature, and difficult to meet, and achieve the effect of improving mechanical properties and corrosion resistance

Inactive Publication Date: 2011-11-09
LEPU MEDICAL TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to its relatively coarse microstructure, precipitated phase and precipitated phase, conventional cast magnesium alloys are also relatively coarse, and are easy to coarsen at high temperatures, so their mechanical properties and corrosion resistance at room temperature are not ideal, and it is difficult to meet the high performance requirements for human implants. material requirements

Method used

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  • Method for preparing magnesium alloy material
  • Method for preparing magnesium alloy material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 6g Mg 94 Zn 6 The medical degradable implant alloy is placed in a quartz tube with a diameter of 15mm and a nozzle width of 0.6mm, and the equipment is vacuumed to 5.0×10 -3 Pa back filled with argon gas of 20kPa and heated by high-frequency induction heating device. When the alloy is melted and overheated at about 50°C, use 5kPa argon to spray the molten liquid onto the high-speed copper quenching plate. The surface line speed is 100m / s. Open, spray argon gas through the gas nozzles installed around the disk to accelerate cooling, such as figure 1 As shown, the powder is finally molded by compression molding. The yield strength of the rapidly solidified magnesium-zinc alloy at 60°C is 120MPa higher than that of the alloy with the same composition after casting and forging, and the tensile strength is 60MPa higher, and it also has good plasticity.

Embodiment 2

[0024] Put 5g of Mg-5Zn-0.5Ca medical degradable implant alloy into a quartz tube with a diameter of 15mm and a nozzle width of 0.6mm, and the equipment is vacuumed to 5.0×10 -3 After Pa, it is reversely filled with 20kPa helium and heated by a high-frequency induction heating device. After the alloy is melted and superheated at about 50°C, spray the molten liquid onto the surface of the high-speed running copper roller with 5kPa helium gas. The copper roller rotates at 2500rpm and the diameter of the copper roller is 220mm. direction to form a thin strip with a thickness of 90 μm and a width of 5 mm, such as figure 2 shown. The tensile yield strength of the Mg-5Zn-0.5Ca thin strip is 490-520MPa, and the theoretical expected value can reach 630MPa, which has high strength and high ductility.

Embodiment 3

[0026] Put 5g of Mg-8Zn-0.5Ca medical degradable implant alloy into a quartz tube with a diameter of 15mm and a nozzle width of 0.6mm, and the equipment is vacuumed to 5.0×10 -3 Pa back filled with argon gas of 20kPa and heated by high-frequency induction heating device. When the alloy is melted and superheated at about 50°C, use 5kPa argon to spray the molten liquid onto the surface of the high-speed running copper roll. The copper roll speed is 3000rpm, and the diameter of the copper roll is 220mm. The liquid alloy is rapidly cooled on the surface of the copper roll, and along the direction of rotation of the copper roll Throw it out to form a thin strip with a thickness of 70 μm and a width of 5 mm, such as figure 2 In the Mg-8Zn-0.5Ca ribbon shown, if the cooling rate is greater than 10 6 K / s can significantly increase the strength and increase the toughness by 3 times.

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Abstract

The invention discloses a method for preparing a magnesium alloy medical degradable implant material by a rapid coagulation technique. The magnesium alloy medical degradable implant material comprises magnesium zinc binary alloy and magnesium zinc calcium ternary alloy. The preparation method comprises the following steps of: jetting the molten magnesium alloy to a quenching disk made of a high thermal conductivity material under the sudden impact action of high-pressure inert gas flow (such as Ar or He), so that the magnesium alloy is atomized and coagulated into fine grains to be scattered all around, and the inert gas is blown by gas nozzles arranged at the periphery of the disk to accelerate cooling; or jetting the molten alloy from the bottom holes of a crucible to the surface of a roller, which rotates at a high speed and is made of a high thermal coefficient material, so that the liquid alloy is coagulated into a thin strip on the surface of the roller. The rapid coagulation method has the advantages of overcoming the defects of low mechanical property, low oxidation resistance and low corrosion resistance of the magnesium alloy produced by the traditional casting method, and greatly improving the mechanical property and the physical property of the magnesium alloy.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy material, in particular to a preparation method of a magnesium alloy medical degradable implant material. Background technique [0002] In the process of metal solidification, the heat transfer intensity and solidification rate of the solidification system have a direct and important influence on the solidification process and alloy structure. Rapid solidification is the extremely rapid transformation of a metal or alloy from a liquid to a solid state at a much faster cooling rate than in conventional processes. [0003] The cooling rate of metal under conventional technology generally does not exceed 10 2 ℃ / S, for example, the cooling rate of large sand castings and ingots is about 10 -6 -10 -3 ℃ / S; medium castings and ingots are about 10 -3 -10 0 ℃ / S; thin-walled castings, die-castings, ordinary atomization is about 10 0 -10 2 °C / S. [0004] The cooling rate of rapidly solidif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10B22F3/03C22C23/04
Inventor 李颖张正才蒲忠杰赵昆张艳龙王洪建
Owner LEPU MEDICAL TECH (BEIJING) CO LTD
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