Key Findings
The study establishes that the alignment of hexagonal boron nitride (h-BN) platelets in 3D-printed composites is primarily governed by the relationship between platelet size and layer thickness. The strongest basal-plane alignment occurs when using the largest platelets (BN45) combined with the thinnest layer thickness (10 micrometers). Conversely, smaller platelets (BN0.9) remain largely randomly oriented due to greater rotational freedom within the printing layers.
Technical Details
The research team dispersed three grades of h-BN microplatelets—with average lateral sizes of 0.9, 12, and 45 micrometers (BN0.9, BN12, and BN45)—into Anycubic Standard Resin+ at weight loadings of 5 to 20 percent. Printing was performed using an MSLA printer with a 405 nanometer light source and layer thicknesses ranging from 10 to 50 micrometers. Post-processing included isopropanol washing and curing under a 450-watt UV system.
- Rheology: All formulations showed shear-thinning. Viscosity increased with higher loadings and smaller platelets; the 20 percent BN0.9 formulation was too viscous for reliable measurement and was excluded.
- Density: Archimedes principle measurements showed density rose consistently with filler loading, tracking theoretical rule-of-mixtures values within approximately 2 percent.
- Orientation Analysis: X-ray diffraction (XRD) and optical microscopy confirmed that decreasing layer thickness from 50 to 10 micrometers increased the alignment function for BN45 composites at 15 percent loading.
Background & Context
Hexagonal boron nitride is prized for its high thermal conductivity along its basal planes and its electrical insulation. However, its anisotropic nature means that randomly oriented fillers in a composite waste much of the material’s thermal potential. While extrusion methods rely on nozzle-induced shear, MSLA relies more heavily on geometric confinement to press platelets flat during the resin recoating process.
Significance & Outlook
By utilizing “control knobs” of platelet size and layer thickness, engineers can now precisely tune heat flow in 3D-printed insulating components. This method allows for the creation of composites with low porosity and high directional thermal performance without requiring high-shear extrusion.
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