Tapered Boron Nitride Particles for Heat Dissipation

The patent applies asymmetry by developing boron nitride particles with a specific asymmetric shape where the diameter gradually increases from one end to the other, creating a tapered or conical morphology. This asymmetric shape allows the particles to stand upright in resin compositions, forming efficient heat conduction pathways from the base (larger diameter end) to the surface (smaller diameter end), thereby significantly enhancing thermal conductivity compared to conventional spherical or flaky particles.

The patent employs parameter changes by carefully controlling the synthesis conditions (temperature, pressure, time, and precursor ratios) during the boron nitride particle formation process. By adjusting these parameters, the gradual diameter increase morphology is achieved through controlled crystal growth dynamics, where the temperature gradient and pressure conditions promote anisotropic growth that results in the tapered shape without requiring complex post-processing or assembly steps.

The patent applies segmentation by producing boron nitride particles with controlled length distribution, where particles of 80 μm or longer are generated through a systematic synthesis process that creates a graded size distribution. This segmentation approach allows the resin composition to incorporate particles of various lengths, with the longer particles providing primary heat conduction pathways while shorter particles fill gaps and improve packing density, thereby maintaining ease of handling while achieving superior heat dissipation performance.