Nanostructured Metallic Network-Polymer Composites for Thermal Interface Materials
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Solution Overview
Problem
Conventional thermal interface materials with high thermal conductivity require high filler loading, leading to increased viscosity and stiffness, which complicates manufacturing and application, and often result in thermal resistance issues due to large particle sizes and filler loadings, limiting their effectiveness in thermal management applications.
Innovation Solution
A composite structure with a connected percolating thermally conducting network is formed by dispersing nanoparticles in a matrix at low filler loading and inducing agglomeration through controlled sintering, creating interconnected pathways for enhanced thermal conductivity without the drawbacks of high filler loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high filler loading (50-60%) is used to achieve high thermal conductivity, then thermal conductivity is improved, but viscosity and stiffness increase, complicating manufacturing and application
Solution Approach 1:
The patent changes the particle size parameter from micrometer scale to nanometer scale (1-100 nm), which fundamentally alters the percolation threshold and network formation behavior. This enables achieving high thermal conductivity at much lower filler loadings (5-20%), thereby reducing viscosity and improving ease of manufacture while maintaining high thermal performance
Solution Approach 2:
The patent creates a composite structure combining nanoparticles with a polymer matrix, where the nanoparticles form a percolating network that provides thermal conductivity pathways. This composite approach allows the system to achieve high thermal conductivity without requiring high filler loading, as the nanoparticle network itself provides the conductive pathways rather than relying on high concentration of discrete particles
2Temperature
If high filler loading is used to achieve high thermal conductivity, then thermal conductivity is improved, but thermal resistance increases due to large particle sizes and filler loadings
Solution Approach 1:
The patent changes the particle size parameter to nanometer scale (1-100 nm), which enables the formation of a percolating network at low filler loadings. This reduces the Bond Line Thickness and minimizes thermal resistance at particle interfaces, thereby achieving high thermal conductivity without the thermal resistance penalties associated with high filler loadings and large particles in conventional TIMs
3Temperature
If particle size is increased above 10 microns to increase conductivity, then thermal conductivity is improved, but Bond Line Thickness increases, resulting in undesirable increase in thermal resistance
Solution Approach 1:
The patent inverts the particle size parameter from large (micrometer scale) to small (nanometer scale, 1-100 nm). This enables the formation of a percolating network through Brownian motion and thermal agitation of the nanoparticles, achieving high thermal conductivity at low filler loadings while minimizing Bond Line Thickness and thermal resistance, thereby eliminating the trade-off present in conventional approaches
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 achieves thermal conductivities several times higher than traditional composites at lower filler volumes, improving heat transfer efficiency and reducing thermal resistance, making it suitable for various thermal management applications.
Implementation Method 1
inducing agglomeration of the metallic nanoparticles into interconnected thermally conducting pathways
Implementation Method 2
a connected percolating thermally conducting network structure embedded within the matrix, the connected percolating metallic network including interconnected thermally conducting pathways
Data Source
AI summary
A composite structure provides high thermal conductivity as a thermal interface structure with a relatively low filler loading. The composite structure is formed by dispersing nanoparticles in a matrix at a low filler loading, and controlled sintering of the composite structure to induce agglomeration of the nanoparticles into a connected percolating thermally conducting network structure within the matrix.