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<p>There has been a growing demand for zinc (Zn)-based composites as prospective material for biodegradable orthopedic implants, due to its biocompatibility and suitable biodegradation rate. However poor mechanical characteristics of pure zinc have limited its use. Focus has been on overcoming the limitations of pure zinc through alloying or fabricating composites. Zinc-based composites exhibit biocompatibility and good resistance to corrosion in biological medium. In the present study Zn–1.5&#xa0;Mg composites were fabricated via the advanced manufacturing technique of microwave sintering with tricalcium phosphate (TCP) and carbon nanotube (CNT) as the nanoreinforcements. Five compositions of the nanocomposites were fabricated varying the wt% of the reinforcements TCP (1–2.5 wt%) and CNT (0.5–2 wt%), respectively. The fabricated composites were evaluated for the mechanical, microstructural, and biocorrosion resistance to evaluate their suitability for orthopedic implant applications. Among the composites, Zn–1.5&#xa0;Mg–2.5TCP–0.5CNT exhibited the best compressive strength (143.37&#xa0;MPa) and microhardness (45.1 HV), whereas Zn–1.5&#xa0;Mg–1.5TCP–1.5CNT exhibited the highest resistance to corrosion with 0.063&#xa0;mm/y in simulated body fluid. Ultimately 1–1.5 wt% CNT and 1.5–2 wt% TCP proved to be the optimum reinforcement concentrations in the composites for balanced mechanical stability and corrosion resistance. Beyond these limits, particle agglomerations and accelerated corrosion were observed.</p>

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Effect of TCP and CNT Content on Mechanical Properties and In Vitro Corrosion Behavior of Microwave-Sintered Zn-1.5 Mg-Based Hybrid Nanocomposites for Biodegradable Orthopedic Implants

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • Priyadarsini Morampudi,
  • Venkata Satya Prasad Somayajula,
  • S. Swetha,
  • B. Sridhar Babu,
  • Marrapu Bhargava,
  • Sesha Narasimha Venkata Ramana Vuppala

摘要

There has been a growing demand for zinc (Zn)-based composites as prospective material for biodegradable orthopedic implants, due to its biocompatibility and suitable biodegradation rate. However poor mechanical characteristics of pure zinc have limited its use. Focus has been on overcoming the limitations of pure zinc through alloying or fabricating composites. Zinc-based composites exhibit biocompatibility and good resistance to corrosion in biological medium. In the present study Zn–1.5 Mg composites were fabricated via the advanced manufacturing technique of microwave sintering with tricalcium phosphate (TCP) and carbon nanotube (CNT) as the nanoreinforcements. Five compositions of the nanocomposites were fabricated varying the wt% of the reinforcements TCP (1–2.5 wt%) and CNT (0.5–2 wt%), respectively. The fabricated composites were evaluated for the mechanical, microstructural, and biocorrosion resistance to evaluate their suitability for orthopedic implant applications. Among the composites, Zn–1.5 Mg–2.5TCP–0.5CNT exhibited the best compressive strength (143.37 MPa) and microhardness (45.1 HV), whereas Zn–1.5 Mg–1.5TCP–1.5CNT exhibited the highest resistance to corrosion with 0.063 mm/y in simulated body fluid. Ultimately 1–1.5 wt% CNT and 1.5–2 wt% TCP proved to be the optimum reinforcement concentrations in the composites for balanced mechanical stability and corrosion resistance. Beyond these limits, particle agglomerations and accelerated corrosion were observed.