Boron Nitride Particles with Streaky Voids for Heat Dissipation
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Solution Overview
Problem
Existing boron nitride powders face challenges in achieving low porosity, particularly for particles with an average diameter of 5 μm or more and less than 30 μm, which affects their thermal conductivity and suitability as thermally conductive fillers in heat dissipation sheets.
Innovation Solution
The formation of boron nitride particles with a streaky void shape in their cross-section, resulting in a porosity of 5% or less, a length-to-width ratio of voids between 3 to 30, and a width of 0.5 μm or less, enhances thermal conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If boron nitride particles with average diameter of 5 μm or more and less than 30 μm are produced by aggregation of primary particles, then the particle size is suitable for heat dissipation applications, but the porosity increases due to the scale shape of primary particles
Solution Approach 1:
The invention changes the morphological parameters of voids within boron nitride particles from conventional shapes to streaky shapes with specific aspect ratios (3-30) and controlled dimensions (width ≤ 0.5 μm). This parameter transformation reduces porosity to 5% or less while maintaining the desired particle size range, thereby resolving the contradiction between particle size and porosity control.
2Volume of moving object
If boron nitride particles are formed by aggregation of primary particles, then the particles can be produced at smaller average diameters, but the thermal conductivity decreases due to increased porosity
Solution Approach 1:
By transforming the void structure parameters to streaky shapes with aspect ratios of 3-30 and widths of 0.5 μm or less, the invention reduces porosity to 5% or less. This enables production of boron nitride particles with average diameters of 5 μm or more and less than 30 μm while maintaining high thermal conductivity, thus resolving the contradiction between particle size and thermal conductivity.
3Ease of manufacture
If conventional boron nitride particles are used, then the production process is simple, but the porosity cannot be sufficiently reduced, affecting thermal conductivity
Solution Approach 1:
The invention introduces a specific void morphology parameter (streaky shape with aspect ratio 3-30 and width ≤ 0.5 μm) that can be achieved through controlled reaction conditions during synthesis. This approach maintains relative manufacturing simplicity while achieving porosity of 5% or less, resolving the contradiction between ease of manufacture and porosity control.
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
This approach enables the production of boron nitride particles with low porosity and improved thermal conductivity, even at smaller average particle diameters, thereby enhancing the performance of heat dissipation sheets.
Implementation Method 1
a vapor of boron carbide is caused to react with nitrogen gas at a high temperature
Data Source
AI summary
The boron nitride particle of the present invention in cross section includes a streaky void. The heat dissipation sheet of the present invention is obtained by forming a thermally conductive resin composition including the boron nitride particle of the present invention and a resin. According to the present invention, a boron nitride particle having a small porosity and a heat dissipation sheet including the boron nitride particle can be provided.