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<p>Magnesium (Mg) and its alloys are promising materials for orthopedic implants due to their low density, light weight, bone-like mechanical properties, and biodegradability. However, their clinical application is limited by insufficient mechanical strength, poor wear resistance, and rapid corrosion, particularly when uniform reinforcement strategies are employed in nano-biocomposites. In the present study, a novel radial reinforcement design incorporating SiO<sub>2</sub> nanoparticles in the core and HA in the shell to simultaneously enhance mechanical strength and corrosion resistance was fabricated using powder metallurgy followed by hot extrusion. The composite consisted of a core reinforced with 1.5% silica (SiO<sub>2</sub>) and an outer layer containing varying amounts of hydroxyapatite (HA) nanoparticles (0 vol%, 3 vol%, 5 vol%, and 10 vol%). The results indicated that incorporating HA nanoparticles, particularly at higher concentrations, significantly enhanced the hardness and reduced the wear rate of the composites. The sample with the highest HA content exhibited the best wear resistance. Meanwhile, moderate HA reinforcement led to the greatest improvement in compressive strength and work-hardening behavior. Reinforced samples consistently showed superior mechanical performance compared with the unreinforced composite. Furthermore, the corrosion resistance of the composites improved as the HA content increased, while the unreinforced sample exhibited the highest corrosion rate. The stronger mechanical strength and better corrosion resistance of HA-reinforced Mg composites suggest that they are a good choice for orthopedic implants.</p>

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Influence of SiO2 and HA Reinforcement Particles and Extrusion Process on Mechanical and Corrosion Properties of Magnesium Radial Nano-biocomposites

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Farzad Rahmani,
  • Alireza Nouri,
  • Ali Sadooghi,
  • Kambiz Bigdeli,
  • Navid Taherkhani,
  • Kaveh Rahmani

摘要

Magnesium (Mg) and its alloys are promising materials for orthopedic implants due to their low density, light weight, bone-like mechanical properties, and biodegradability. However, their clinical application is limited by insufficient mechanical strength, poor wear resistance, and rapid corrosion, particularly when uniform reinforcement strategies are employed in nano-biocomposites. In the present study, a novel radial reinforcement design incorporating SiO2 nanoparticles in the core and HA in the shell to simultaneously enhance mechanical strength and corrosion resistance was fabricated using powder metallurgy followed by hot extrusion. The composite consisted of a core reinforced with 1.5% silica (SiO2) and an outer layer containing varying amounts of hydroxyapatite (HA) nanoparticles (0 vol%, 3 vol%, 5 vol%, and 10 vol%). The results indicated that incorporating HA nanoparticles, particularly at higher concentrations, significantly enhanced the hardness and reduced the wear rate of the composites. The sample with the highest HA content exhibited the best wear resistance. Meanwhile, moderate HA reinforcement led to the greatest improvement in compressive strength and work-hardening behavior. Reinforced samples consistently showed superior mechanical performance compared with the unreinforced composite. Furthermore, the corrosion resistance of the composites improved as the HA content increased, while the unreinforced sample exhibited the highest corrosion rate. The stronger mechanical strength and better corrosion resistance of HA-reinforced Mg composites suggest that they are a good choice for orthopedic implants.