CN-121976091-A - Method for reinforcing biomedical zinc-based alloy mechanics by barb-shaped eutectic structure

Abstract

The invention relates to a method for reinforcing biomedical zinc-based alloy mechanics by a barb-shaped eutectic structure, belonging to the field of biomedical material manufacturing. The barb-shaped eutectic structure reinforced biomedical zinc-based alloy consists of zinc powder, aluminum powder (5 wt.%) and tin powder, wherein the mass percentage of the tin powder is 0.5-3.6wt.%. And after the zinc powder, the aluminum powder and the tin powder are mechanically mixed and dispersed by ball milling, electric spark sintering is utilized for forming. The invention has the beneficial effects that by generating the barb-shaped eutectic structure, a multi-angle contact surface can be formed between the barb-shaped eutectic structure and the grain boundary of each grain, and more force points are formed on the surface of the grain boundary, so that the capability of resisting deformation of different degrees is greatly improved, and the mechanical property of the biomedical zinc-based alloy is improved.

Inventors

• LI SHENG
• YANG XIONGFENG
• JIANG YULIN
• Ren Jianzeng
• Jin Xuanxin
• ZHOU XIN
• Ma Zanyu
• TIAN YUANYU
• ZENG ZHIJIE
• LIU AO

Assignees

• 湖南理工学院

Dates

Publication Date

20260505

Application Date

20231201

Claims (9)

1. 1. A method for reinforcing biomedical zinc-based alloy mechanics by barb-like eutectic structure comprises zinc powder, aluminum powder (5 wt.%) and tin powder, wherein the mass percentage of the tin powder is 0.5-3.6wt.%.
2. 2. The method for reinforcing biomedical zinc-based alloy mechanics with barb-like eutectic structures according to claim 1, wherein the mass percentage of the tin powder is 2.0-3.0wt.%.
3. 3. The method for reinforcing biomedical zinc-based alloy mechanics with barb-like eutectic structures according to claim 1, wherein the mass percentage of the tin powder is 2.4wt.%.
4. 4. The method for reinforcing biomedical zinc-based alloy mechanics with barb-like eutectic structures according to claim 1, wherein the size of the tin powder is 15-25 microns, the size of the zinc powder is 30-50 microns, and the size of the aluminum powder is 20-30 microns.
5. 5. The method for reinforcing biomedical zinc-based alloy mechanics by using barb-like eutectic structures as claimed in claim 1, comprising the following steps: step one, mechanical mixing: after the tin powder is dried at constant temperature, adding zinc powder and aluminum powder (5 wt.%) into the mixed powder in 2-5 times of equal weight, stirring for 25-35 minutes, and uniformly dispersing the tin powder; Step two, ball milling and dispersing: after mechanical mixing, loading the zinc, aluminum and tin mixed powder into a ball mill for wet ball milling and dispersing, wherein the ball material ratio is 10:1, the rotating speed of the ball mill is 200-350r/min, the ball milling time is 180-330 minutes in the ball milling and dispersing process, and the ball mill is stopped for 3-10 minutes after running for 30-60 minutes each time in order to prevent excessive heat generated in a ball milling tank due to friction; step three, electric spark sintering: and (3) performing solidification molding on the zinc, aluminum and tin mixed powder subjected to ball milling and dispersing by adopting an electric spark sintering process, wherein the sintering temperature is 250-360 ℃, the sintering pressure is 9-20KN, and the heat preservation time is 8-25 minutes.
6. 6. The method for reinforcing biomedical zinc-based alloy mechanics with a barb-like eutectic structure according to claim 1, wherein the rotating speed of the ball mill is 250r/min.
7. 7. The method for reinforcing biomedical zinc-based alloy mechanics with a barb-like eutectic structure according to claim 1, wherein the electric spark sintering temperature is 250-360 degrees.
8. 8. The method for reinforcing biomedical zinc-based alloy mechanics with a barb-like eutectic structure according to claim 1, wherein the spark sintering pressure is 9-20KN.
9. 9. The method for reinforcing biomedical zinc-based alloy mechanics with a barb-like eutectic structure according to claim 1, wherein the ultimate compressive strength is 188.31-263.67Mpa.

Description

Method for reinforcing biomedical zinc-based alloy mechanics by barb-shaped eutectic structure Technical Field The invention relates to preparation of biomedical degradable zinc-based alloy bone implant materials, and belongs to the field of biomedical material manufacturing. Background In recent years, biodegradable zinc metal has attracted increasing attention due to its suitable degradation rate and good biocompatibility. A suitable degradation rate means that the implant will gradually degrade over a suitable period of time, adapting to the progress of tissue repair, without adversely affecting normal physiological function. The biodegradable zinc metal not only has proper degradation rate, but also can be well degraded after tissue repair is completed, thereby avoiding the requirement of secondary operation extraction. Meanwhile, good biocompatibility of biodegradable zinc metal is one of its attractive properties. Zinc is an essential trace element in the human body and is involved in various biological functions such as gene expression, nucleic acid metabolic reaction and signal transmission. The effect of zinc metal in bone tissue to promote the proliferation and differentiation of bone cells by gradually releasing zinc ions during bone repair further emphasizes the potential advantages of biodegradable zinc metal in orthopedic applications. Although the biodegradable zinc metal has proper degradation rate and good biocompatibility in organisms, the mechanical property of the biodegradable zinc metal serving as a hard alloy material is relatively insufficient, the ultimate compressive strength of pure zinc is only 120MPa, the bearing property after implantation is certainly affected, and the application of the biodegradable zinc metal in the field of biomedical material manufacturing is limited. Various researches are searching for a method for improving the mechanical properties of biodegradable zinc metal, and the result shows that the adoption of alloying of different elements to promote the formation of eutectic is an effective way for remarkably improving the mechanical properties of the biodegradable zinc metal. At present, studies on granular, rod-like, lamellar and other eutectic structures prove that the mechanical properties of biodegradable zinc can be improved, but the eutectic structures have fewer contact surfaces with grain boundaries and insufficient points of force, and the requirements of bearing the mechanical properties of bone tissue repair cannot be completely met. Therefore, it is necessary to find a new eutectic structure to enhance the mechanical properties of biodegradable zinc metal. Disclosure of Invention Aiming at the problem that the mechanical property of biomedical zinc metal is relatively insufficient to influence the bearing property after implantation in the prior art, the invention provides a method for enhancing the mechanical property of biomedical zinc-based alloy by a barb-shaped eutectic structure. Aluminum and tin are introduced into biomedical metal zinc, under the action of local high temperature at the moment of electric spark sintering, aluminum in zinc-aluminum eutectic is higher in melting point, aluminum is preferentially separated out along the grain boundary, tin with the lowest melting point is kept in a liquid state for a long time, flowing occurs under the action of electric spark sintering pressure, and in the flowing process, liquid tin not only disperses the separated aluminum, but also forms a barb-shaped zinc-tin eutectic with zinc. Compared with granular, bar-shaped and other eutectic structures, the barb-shaped eutectic structures and grain boundaries of each grain can form multi-angle contact surfaces, and more acting points are formed on the surface of the grain boundaries, so that the capability of resisting deformation of different degrees is greatly improved, and the mechanical property of the biomedical zinc-based orthopedic implant material is improved. In addition, the barb-shaped eutectic structure refines the crystal grains of the biomedical zinc-based alloy to form a more compact and nonporous microscopic surface. Meanwhile, the tin element in the barb-shaped zinc-tin eutectic has certain stability in vivo, can promote growth and development and wound healing, and has good biocompatibility. In order to achieve the purpose of enhancing the mechanical property of biomedical zinc-based alloy through a barb-shaped eutectic structure, the invention provides the following technical scheme: a method for reinforcing biomedical zinc-based alloy mechanics by barb-like eutectic structure comprises zinc powder, aluminum powder (5 wt.%) and tin powder, wherein the mass percentage of the tin powder is 0.5-3.6wt.%. Further, in the method for reinforcing biomedical zinc-based alloy mechanics by the barb-like eutectic structure, the mass percentage of the tin powder is 2.0-3.0 wt%. Further, in the method for reinforcing biomedical zinc-based al