Is there no way to improve the thermal conductivity of aluminum hydroxide?

Proven Strategies to Enhance ATH’s Thermal Conductivity

1. Hybrid Filler Systems: Synergistic Boosting

• Core Concept: Combine ATH with high-κ ceramics (e.g., AlN, BN)

• Data-Driven Results:

  • Epoxy Composite (60 vol% filler):

    • Pure ATH: 0.31 W/m·K

    • ATH + 15% BN platelets: 1.2 W/m·K (287% ↑)

    • ATH + 10% AlN: 0.95 W/m·K (206% ↑)

• Key Advantage: Preserves flame retardancy (ATH) + adds thermal path (ceramics)

2. Surface Functionalization: Reducing Interface Resistance

• Method: Silane coupling agents (e.g., KH-550) on ATH particles

• Impact:

  • ↓ Interfacial phonon scattering by 40–60%

  • ↑ Thermal conductivity of silicone/ATH composite to 0.68 W/m·K (vs. 0.33 W/m·K untreated)

• Mechanism: Stronger polymer-filler bonding improves heat transfer efficiency

3. Morphology Engineering: Creating Thermal Pathways

• Approach:

  • Spherical ATH (vs. irregular): Improves packing density

  • Size Gradation: Bimodal distribution (e.g., 1μm + 10μm) fills voids

• Performance:

  • Thermal κ in PVC cable compound: 0.52 W/m·K (vs. 0.28 W/m·K standard ATH)

  • UL94 V-0 rating maintained at 55 wt% loading

Real-World Applications: Where Enhanced ATH Matters

• EV Battery Packs: Flame-retardant potting compounds with 1.0+ W/m·K thermal conductivity

• 5G Base Stations: Halogen-free PCB substrates balancing FR4 processability and heat dissipation

• LED Housing: Silicone encapsulants passing IEC 60695 (glow-wire test) while reducing junction temp by 15°C

The Future: Next-Gen ATH Modification

Emerging techniques set to push boundaries further:

1. Core-Shell Structures: ATH@AlN nanoparticles (κ = 1.8 W/m·K in trials)

2. Graphene Bridging: 2D carbon networks connecting ATH particles (κ ↑ 400% at 0.5 wt% loading)

3. AI-Driven Formulation: Machine learning optimizing particle size/distribution for maximal κ