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Optimization of Silicon Nitride Nanopowder Content in Polyamide 12 (PA12) in Extrusion-Based Additive Manufacturing
Markos Petousis1, Apostolos Korlos2, Nikolaos Michailidis3,4
1Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece.
Nanomaterials (Basel, Switzerland)
|January 9, 2026
Summary
Silicon nitride (Si3N4) nanoparticles significantly enhance polyamide-12 (PA12) for 3D printing. These ceramic-polymer nanocomposites improve mechanical strength and stiffness for robust, lightweight structural components.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Polyamide-12 (PA12) is a promising thermoplastic for additive manufacturing (AM).
- Enhancements in mechanical strength and stiffness are needed for load-bearing applications of PA12.
- Silicon nitride (Si3N4) nanoparticles offer potential for reinforcing polymer matrices.
Purpose of the Study:
- To investigate the reinforcement efficiency of Si3N4 nanoparticles in a PA12 matrix.
- To evaluate the impact of varying Si3N4 filler loadings (2.0-10.0 wt. %) on PA12 properties.
- To assess the suitability of PA12/Si3N4 nanocomposites for material extrusion (MEX) 3D printing.
Main Methods:
- Melt compounding was used to create PA12/Si3N4 composite filaments.
- Material extrusion (MEX) 3D printing was employed to fabricate components.
- Comprehensive characterization included thermal, rheological, morphological, structural, and mechanical analyses (tensile, flexural, impact, microhardness).
- Scanning electron microscopy (SEM) was utilized for morphological and compositional analysis.
Main Results:
- Si3N4 nanoparticles significantly improved all tested mechanical properties of PA12.
- Tensile strength and elastic modulus increased by over 20% compared to neat PA12.
- Structural characteristics, including porosity and dimensional deviation, were also enhanced.
- SEM analysis confirmed effective dispersion and reinforcement.
Conclusions:
- Si3N4 nanoparticles serve as a viable reinforcement filler for PA12.
- The resulting ceramic-polymer nanocomposites are suitable for lightweight, robust structural components via MEX AM.
- These nanocomposites expand the applicability of PA12 in demanding, high-performance applications.
