Mg-Ba series magnesium alloy and preparation method and application thereof

A magnesium alloy, mg-ba technology, applied in prosthesis, surgery, medical science, etc., can solve the problems of unclear metabolism/excretion, excessive corrosion, hidden dangers in medical applications, etc., to improve development and safety. performance, and the effect of optimizing mechanical properties

Active Publication Date: 2022-08-05
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing degradable magnesium alloys have the problems of rapid degradation, severe local corrosion, poor tissue compatibility, and poor integration of materials and osseointegration, which to some extent limits their application in orthopedics. and promotion
The reason is that the electrode potentials of most of the alloying elements in the existing medical magnesium alloys are higher than that of Mg. According to the mixed potential theory, the potential of the second phase formed by these alloying elements and Mg is correspondingly higher than that of the Mg matrix. When a galvanic couple is formed in the environment, the Mg matrix will corrode preferentially, often resulting in too fast corrosion, severe localized corrosion and premature failure of the device
In addition, whether these relatively stable second phases can be degraded and finally metabolized / expelled is still unclear, and there are hidden dangers in medical applications

Method used

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  • Mg-Ba series magnesium alloy and preparation method and application thereof
  • Mg-Ba series magnesium alloy and preparation method and application thereof
  • Mg-Ba series magnesium alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Pure Mg (99.98 wt. %) and pure Ba (99.9 wt. %) raw materials (pure metal / master alloy) were weighed in proportion, and smelted in an induction furnace after mixing sufficiently. After vacuuming (-2 Pa), filled with high-purity argon gas as a protective atmosphere, smelted at 800 ° C, applied electromagnetic stirring or mechanical stirring to the melt, after holding for 30 minutes, the uniform melt was introduced into two counter-rotating rolls, and the cooling process In the process, simultaneous casting and rolling are achieved to obtain pre-deformed Mg-Ba alloys with different alloy compositions, including: Mg-0.2Ba, Mg-0.5Ba, Mg-1.0Ba, Mg-2.0Ba, Mg-10Ba.

Embodiment 2

[0055] Referring to the method described in Example 1, smelting at 750-900°C, synchronous casting and rolling, Mg-0.2Ba, Mg-0.5Ba, Mg-1.0Ba and Mg-2.0Ba pre-deformed alloys were obtained. The pre-deformed alloy was homogenized at 400°C for 10 hours, then air-cooled and extruded at equal diameter angles. The Bc path was adopted, the extrusion speed was controlled at 2 mm / s, the extrusion passes were 4 times, and the extrusion temperature was 300°C. After the equal-diameter angular extrusion treatment, the grains of the Mg-Ba alloy were further refined significantly, and the second phase particles were effectively broken ( figure 1 ). X-ray diffraction (XRD) results show that the second phase in the above Mg-Ba alloy is Mg 17 Ba 2 ( figure 2 ).

Embodiment 3

[0057] Referring to the method described in Example 1, a Mg-Ba series alloy was prepared. After the pre-deformed alloy was homogenized at 400 °C for 10 hours, it was extruded at 300-400 °C. The extrusion ratio was controlled to be 25, and the extrusion speed was 4 mm / s. It is extruded to a diameter of 10 mm one at a time to obtain a Mg-Ba binary alloy extruded rod. Room temperature tensile experiments were performed on the obtained Mg-Ba based alloys. It can be found that the addition of Ba significantly improves the tensile properties of magnesium alloys ( image 3 ). When the Ba content is 0.2wt.%, the yield strength (96±6MPa) of the corresponding alloy is still low. When the Ba content increases to 0.5wt.%, the yield strength (121±9MPa) increases by 26% compared with Mg-0.2Ba %. When the Ba content was further increased to 2.0 wt.%, the yield strength was further increased (134±9MPa). The change of tensile strength of as-extruded Mg-Ba alloy with Ba content is consisten...

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Abstract

The invention discloses an Mg-Ba series magnesium alloy and a preparation method and application thereof. The alloy comprises Mg and Ba. According to the mass percent, the content of Ba in the alloy is 0-10.0 wt.%, but not including 0, and the balance is Mg; the composite material is prepared by a method of combining a synchronous pouring and rolling pre-deformation technology with a deep plastic processing means, and can be used for preparing orthopedic medical implants. The Mg-Ba alloy disclosed by the invention can be uniformly corroded, has no second phase residue, no release of toxic and harmful elements and is controllably degraded, so that the Mg-Ba alloy disclosed by the invention is ensured to have good cell and tissue reactions and good in-vivo and osseointegration.

Description

technical field [0001] The invention belongs to the field of medical degradable metal materials, and particularly relates to a Mg-Ba series magnesium alloy and a preparation method and application thereof. Background technique [0002] Traditional medical metal materials such as stainless steel and titanium alloy have good mechanical properties and corrosion resistance, and are widely used in clinical practice. However, the long-term retention of such materials as foreign bodies in the body may cause varying degrees of irritation to surrounding tissues, which may result in a series of serious consequences. For example, the elastic modulus of traditional metal internal fixation materials is much higher than that of human bone, and there is a "stress shielding" effect, which easily leads to the lack of sufficient stress stimulation in the bone, resulting in delayed fracture healing and even secondary fractures. For another example, due to the wear of implant materials and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06B22D11/06A61L27/04A61L27/50A61L27/58A61L31/02A61L31/14A61L31/18
CPCC22C23/00C22C1/02C22F1/06B22D11/001B22D11/0622A61L27/047A61L31/022A61L31/148A61L27/58A61L27/50A61L31/18A61L2430/02
Inventor 郑玉峰刘洋夏丹丹边东成艳
Owner PEKING UNIV
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