Hexagonal Boron Nitride Powder for Low-Loss Heat-Dissipating Sheets
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Solution Overview
Problem
Existing heat-dissipating members, such as those using boron nitride fillers, struggle to maintain low dielectric loss tangents and exhibit insufficient filling properties due to high dielectric loss tangents of the filler materials, which hinder the effective dissipation of heat in faster and larger capacity electronic components.
Innovation Solution
A boron nitride powder with specific particle characteristics, including an average diameter of 4.0 to 7.0 μm, a BET specific surface area of 3.0 m2/g or less, and a graphitization index of 1.2 or less, is produced through a method involving a firing and pulverization process under controlled nitrogen pressure, ensuring low dielectric loss and excellent filling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If boron nitride particles are used as filler material in heat-dissipating members, then thermal conductivity is improved, but dielectric loss tangent increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle diameter (4.0 to 7.0 μm), BET specific surface area (3.0 m2/g or less), and graphitization index (1.2 or less) of boron nitride particles. These parameter optimizations enable the filler to provide excellent thermal conductivity while maintaining low dielectric loss tangent, resolving the contradiction between thermal performance and energy loss.
2Quantity of substance
If filler material with large particle diameter is used, then filling property is improved, but dielectric loss tangent increases due to increased functional groups on side surfaces
Solution Approach 1:
The patent optimizes the particle diameter parameter to a specific range (4.0 to 7.0 μm) that balances filling property and dielectric loss. This parameter control ensures sufficient filling capability while limiting the proportion of side surface functional groups that would otherwise increase dielectric loss tangent.
Solution Approach 2:
The patent addresses local quality by controlling the distribution and characteristics of functional groups on particle side surfaces. By optimizing particle morphology and size, the patent reduces the relative proportion of side surfaces where functional groups are located, thereby locally minimizing dielectric loss while maintaining overall filling property.
3Loss of energy
If resin with low dielectric loss tangent is used, then dielectric loss tangent is reduced, but processability and mechanical properties deteriorate
Solution Approach 1:
The patent uses optimized boron nitride particles as an intermediary filler material that enables the use of resins with better processability and mechanical properties. The carefully controlled particle characteristics (diameter, surface area, graphitization index) allow the filler to provide low dielectric loss tangent without compromising the resin's processability or mechanical strength.
4Area of stationary object
If primary particles have large thickness, then BET specific surface area is reduced, but proportion of side surfaces increases leading to higher dielectric loss tangent
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of primary particles to achieve a balanced state. The particle thickness is controlled to maintain low BET specific surface area (reducing overall surface-related dielectric loss) while preventing excessive side surface proportion. This parameter optimization resolves the contradiction between surface area reduction and side surface proportion 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
The boron nitride powder achieves a low dielectric loss tangent and superior filling properties, enhancing the thermal conductivity and insulating capabilities of heat-dissipating sheets, suitable for high-performance electronic components.
Implementation Method 1
boron nitride particles have high thermal conductivity and highly insulating properties
Implementation Method 2
highly insulating properties
Data Source
AI summary
An aspect of the present disclosure provides a boron nitride powder including primary particles of hexagonal boron nitride each having a scale shape, in which an average particle diameter is 4.0 to 7.0 μm, a BET specific surface area is 3.0 m2/g or less, and a graphitization index is 1.2 or less.