Medical magnesium alloy with uniform controllable degradation performance and preparation method thereof

A magnesium alloy and performance technology, which is applied in the field of medical magnesium alloy and its preparation, can solve the problems of uneven degradation and too fast degradation rate of magnesium alloy, and achieve the effect of uniform degradation mode and controllable degradation behavior.

Active Publication Date: 2018-11-30
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to overcome the disadvantages of too fast and uneven degradation of magnesium alloys in the above-mentioned prior art, the purpose of the present invention is to provide a medical magnesium alloy with uniform and controllable degradation performance and its preparation method, which uses SLM technology to alloy rare earth Adding element Gd to the ZK30 magnesium alloy, on the one hand, it forms a fine LPSO structure and is evenly distributed inside the alloy grains, on the other hand, it inhibits the precipitation of intermetallic compounds, thereby improving the degradation resistance of the magnesium alloy

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  • Medical magnesium alloy with uniform controllable degradation performance and preparation method thereof
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Experimental program
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Effect test

Embodiment 1

[0029] Weigh 9.0 grams of ZK30 powder (particle size 40-60 μm) and 1.0 gram of rare earth element Gd powder (particle size 5-10 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 400 rpm, ball milling time 4 hours. Using the above mixed powder as raw material, a medical magnesium alloy containing LPSO structure was prepared by SLM; during the preparation process, the laser power was controlled to 80W, the scanning speed was 300mm / min, and the spot diameter was 80μm.

[0030] The test found that fine grains and fine LPSO phases were formed in the prepared alloy, and LPSO was uniformly dispersed in the grains, while avoiding the precipitation of the second phase of intermetallic compounds ( figure 1 a). Electrochemical tests found that compared with ZK30 alloy, the corrosion current of magnesium alloy containing LPSO phase was from 80.91μA / cm2 of ZK30 2 Reduced to 26.73μA / cm 2 ; In addition, the degradation ...

Embodiment 2

[0032] Weigh 9.0 grams of ZK30 powder (particle size 40-60 μm) and 1.0 gram of rare earth element Gd powder (particle size 5-10 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 400 rpm, ball milling time 4 hours. Using the above mixed powder as raw material, a medical magnesium alloy containing LPSO structure was prepared by SLM; during the preparation process, the laser power was controlled to 70W, the scanning speed was 400mm / min, and the spot diameter was 60μm.

[0033] The test found that the LPSO phase was formed in the prepared alloy, and the LPSO was distributed uniformly and dispersed inside the grains, while avoiding the precipitation of the second phase of intermetallic compounds. Electrochemical tests found that compared with ZK30 alloy, the corrosion current of magnesium alloy containing LPSO phase was from 80.91μA / cm2 of ZK30 2 Reduced to 31.05μA / cm 2 ; In addition, the degradation mode of th...

Embodiment 3

[0035]Weigh 9.4 grams of ZK30 powder (particle size 40-60 μm) and 0.6 gram of rare earth element Gd powder (particle size 5-10 μm), place the two in a ball mill, and ball mill under a protective atmosphere to obtain a uniformly mixed powder. 400 rpm, ball milling time 4 hours. Using the above mixed powder as raw material, a medical magnesium alloy containing LPSO structure was prepared by SLM; during the preparation process, the laser power was controlled to 80W, the scanning speed was 300mm / min, and the spot diameter was 80μm.

[0036] The test found that the LPSO phase was formed in the prepared alloy, and the LPSO was distributed uniformly and dispersed inside the grains, while avoiding the precipitation of the second phase of intermetallic compounds. Electrochemical tests found that compared with ZK30 alloy, the corrosion current of magnesium alloy containing LPSO phase was from 80.91μA / cm of ZK30 to 2 Reduced to 40.65μA / cm 2 ; In addition, the degradation mode of the pr...

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Abstract

The invention discloses a medical magnesium alloy with uniform controllable degradation performance and a preparation method thereof. The magnesium alloy is composed of a ZK30 matrix and long-period stacking ordered structures uniformly distributed in ZK30 grains. The method comprises the preparation steps that Gd powder and ZK30 powder are subjected to ball-milling under protective atmosphere, uniformly dispersed mixed powder is obtained, and then the magnesium alloy with the LPSO structures is prepared through laser selective melting. By adopting a laser selective melting process, rapid melting and rapid solidifying can be achieved, on the one hand, matrix grains and the LPSO structures are greatly refined, on the other hand, the solid solubility of solute elements is improved, and precipitation of intermetallic compounds is avoided; the formed LPSO structures are in the form of parallel layers and are evenly distributed in the matrix grains, the directions of the LPSO structures aredifferent in the different grains, and thus expansion of the degradation process to the adjacent grains can be effectively hindered; and meanwhile, the LPSO structures are used as an unstable secondphase and are preferentially degraded, compact degraded products are formed, and the magnesium matrix is further protected.

Description

technical field [0001] The invention belongs to the technical field of medical alloy preparation, in particular to a medical magnesium alloy with uniform and controllable degradation performance and a preparation method thereof. Background technique [0002] Magnesium alloys are widely used as bone implant materials due to their unique biodegradability, excellent biocompatibility and suitable mechanical properties. The elastic modulus (40-45GPa) of magnesium alloy is similar to that of human natural bone (10-40GPa), which can effectively reduce the stress shielding effect. In addition, the magnesium ion released by degradation is an important cation in the human body. In addition to participating in various metabolisms, it is also directly related to the calcification process of bone tissue and is a key factor in bone metabolism. However, the rapid degradation rate and uneven degradation mode of magnesium alloys lead to premature loss of mechanical integrity, which limits t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/04
CPCC22C1/0408C22C23/06
Inventor 帅词俊高成德
Owner JIANGXI UNIV OF SCI & TECH
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