Process for Preparing Porous Magnesium Rings and Performance Optimization

　　Porous magnesium rings, as a bio-material with a unique structure, demonstrate promising applications in both medical and industrial fields. Their fabrication processes and performance optimization are currently key areas of focus in materials research.

　　In terms of manufacturing processes, powder metallurgy is currently the most common approach. This method involves mixing magnesium powder with a pore-forming agent, followed by compression molding and sintering to create a porous structure. Key process parameters, such as sintering temperature and duration, directly influence the material's porosity and mechanical strength. Another method is the template-based technique, which uses removable template materials to precisely define the desired pore structure, allowing for more accurate control over pore size distribution. Meanwhile, the introduction of 3D printing technology has opened up new possibilities for fabricating complex, porous magnesium rings, enabling customized pore designs through layer-by-layer additive manufacturing.

　　Performance optimization primarily revolves around three key dimensions. First is the control of structural characteristics: by adjusting the proportion and particle size of the pore-forming agent, it’s possible to achieve a porosity range of 20% to 80%, with pore sizes typically falling between 100 and 500 micrometers. This highly tunable porous structure not only ensures the material’s lightweight properties but also lays a solid foundation for subsequent functional applications. Second is the enhancement of mechanical performance—adding appropriate amounts of alloying elements or employing hot isostatic pressing can boost compressive strength to levels required for medical implants. Finally, degradation rate can be fine-tuned: through surface coatings or compositional optimization, the degradation period can be precisely tailored to meet diverse clinical needs.

　　In practical applications, the advantages offered by porous structures are primarily evident in two key aspects. First, the interconnected network of pores facilitates the efficient transport of nutrients and promotes tissue ingrowth—a factor that is especially critical for osseointegration in orthopedic implants. Second, the larger specific surface area accelerates the uniform degradation of the magnesium matrix, preventing the risk of structural failure caused by excessively rapid localized corrosion. These unique characteristics make porous magnesium rings particularly valuable for applications such as biodegradable vascular stents and bone defect fillers.

　　Current process improvements are focused on addressing two key technical challenges: first, enhancing the uniformity of the pore structure to prevent localized densification or pore collapse; and second, balancing degradation performance with mechanical strength to ensure adequate support during the initial stages of implantation. Researchers are exploring innovative solutions such as gradient pore structure designs and advanced composite coating technologies, aiming to further enhance the reliability and performance of the material.