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<p>Extrusion-based additive manufacturing (EAM) of metal components follows the fundamental principles of powder metallurgy, including shaping, debinding, and sintering. In addition to advantages such as simplicity and cost-effectiveness, this method is particularly suitable for fabricating nanocomposites. In this study, SS316L and SS316L/CNT nanocomposite components were fabricated using EAM. The influence of carbon nanotubes on the properties of the feedstock, green parts, and sintered components was investigated. The incorporation of 1&#xa0;wt.% carbon nanotubes into the feedstock increased shear rate sensitivity and improved homogeneity. In the nanocomposite samples, volumetric shrinkage increased by 2%, while density decreased by 2.8%. Additionally, a 30.5% enhancement in hardness was achieved, along with reductions of 52% and 41.5% in wear rate and coefficient of friction, respectively. The microstructure of the sintered parts and worn surfaces was also analyzed.</p>

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Mechanical and Microstructural Characterization of SS316L/CNT Nanocomposites Fabricated via Extrusion-Based Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Haidar Ramazani,
  • Abdolvahed Kami,
  • Hassan Abdoos

摘要

Extrusion-based additive manufacturing (EAM) of metal components follows the fundamental principles of powder metallurgy, including shaping, debinding, and sintering. In addition to advantages such as simplicity and cost-effectiveness, this method is particularly suitable for fabricating nanocomposites. In this study, SS316L and SS316L/CNT nanocomposite components were fabricated using EAM. The influence of carbon nanotubes on the properties of the feedstock, green parts, and sintered components was investigated. The incorporation of 1 wt.% carbon nanotubes into the feedstock increased shear rate sensitivity and improved homogeneity. In the nanocomposite samples, volumetric shrinkage increased by 2%, while density decreased by 2.8%. Additionally, a 30.5% enhancement in hardness was achieved, along with reductions of 52% and 41.5% in wear rate and coefficient of friction, respectively. The microstructure of the sintered parts and worn surfaces was also analyzed.