Hexagonal BN Powder Composition for Isotropic Heat Dissipation
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Solution Overview
Problem
Existing hexagonal boron nitride (h-BN) powders used as fillers in insulating heat dissipation materials suffer from insufficient strength, leading to collapse and anisotropy, which decreases thermal conductivity and insulation properties.
Innovation Solution
A h-BN powder with a specific particle size distribution, aggregation strength, and ultrasonic treatment to enhance thermal conductivity and withstand voltage, produced through a method involving mixing boron nitride with boron compounds and carbon sources, followed by firing and grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If h-BN powder with aggregates of primary particles is used as filler, then filling properties improve, but aggregate strength is insufficient causing collapse and anisotropy
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution parameters (D10, D50, D90 values) and aspect ratio of h-BN aggregates. By controlling these physical parameters within specific ranges, the aggregates achieve both sufficient strength to prevent collapse and optimal packing density for improved filling properties in the resin matrix.
2Reliability
If aggregates have sufficient strength to prevent collapse, then filling properties improve, but anisotropy of characteristics increases due to orientation
Solution Approach 1:
The patent utilizes the asymmetric shape of plate-like h-BN aggregates with controlled aspect ratios. This asymmetric geometry enables the particles to interlock and form isotropic networks in the resin matrix, preventing preferential orientation while maintaining structural stability and preventing collapse under processing conditions.
3Temperature
If h-BN powder is used to improve thermal conductivity, then heat dissipation properties improve, but insulation properties decrease due to anisotropy
Solution Approach 1:
The patent achieves homogeneity by creating an isotropic distribution of h-BN aggregates with uniform particle size distribution and aspect ratio control. This homogeneous dispersion ensures uniform thermal conductivity throughout the resin matrix without creating anisotropic pathways that would compromise insulation properties, thereby simultaneously improving heat dissipation while maintaining electrical insulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The h-BN powder improves thermal conductivity and withstand voltage when used as a filler, providing a heat dissipation material with enhanced heat dissipation and insulation properties.
Implementation Method 1
h-BN particles have a layered structure similar to that of graphite and are excellent in characteristics such as thermal conductivity
Implementation Method 2
when the hexagonal boron nitride powder is ultrasonically treated under the following condition 1 for 3 minutes
Implementation Method 3
h-BN particles have a layered structure similar to that of graphite and are excellent in characteristics such as thermal conductivity, electrical insulation properties
Data Source
AI summary
A hexagonal BN powder containing an aggregate of primary particles of hexagonal BN nitride and having an average primary particle diameter, a 50% volume cumulative particle diameter D50, a BET specific surface area, and a bulk density within predetermined ranges. Further, for a peak A in the particle diameter range of 1.0 μm or more and less than 20.0 μm and a peak B in the particle diameter range of 20.0 μm or more and less than 200.0 μm in a particle size distribution curve, the ratios of the height of the peaks are within predetermined ranges when the hexagonal BN powder is treated under predetermined conditions. Also disclosed is a method for producing the hexagonal BN powder, a composition including the hexagonal BN powder and at least one of a resin and a rubber, and a heat dissipation material containing the composition.