Thermal Interface Material Using Conductive Nanoparticles
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Solution Overview
Problem
Current thermal interface materials (TIMs) face limitations in thermal conductivity due to the low thermal conductivity of polymer matrices and the inability of electrically conductive materials to be used in non-electrically conductive applications, leading to inefficient heat transfer between heat sinks and heat-producing components.
Innovation Solution
The use of a thermal interface composition comprising non-electrically conductive micron-sized filler particles and electrically conductive nanoparticles in a polymer matrix, which enhances thermal conductivity while maintaining electrical isolation, allowing for improved heat transfer in both TIMs and underfill materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrically conductive materials are used to enhance thermal conductivity, then thermal management performance improves, but electrical insulation is compromised leading to potential electrical shorts
Solution Approach 1:
The thermal conduction path is segmented into multiple hops through nanoparticle bridges between micron-sized filler particles, rather than relying on continuous electrically conductive material. This segmentation allows thermal transfer while maintaining electrical insulation through the non-conductive polymer matrix.
Solution Approach 2:
The patent applies different material properties at different scales: micron-sized non-conductive particles provide structural framework and electrical insulation, while nanosized conductive particles provide thermal conduction pathways. This local differentiation of material qualities resolves the contradiction between thermal performance and electrical insulation.
2Reliability
If polymer matrices are used for electrical insulation, then electrical safety is maintained, but thermal conductivity remains low limiting heat transfer efficiency
Solution Approach 1:
The patent creates a composite material system combining polymer matrix (for insulation), micron-sized filler particles (for structural support and insulation), and nanosized conductive particles (for thermal conduction). This multi-component composite achieves both electrical insulation and enhanced thermal conductivity simultaneously.
Solution Approach 2:
The patent changes the size parameter of filler particles from micron-scale to nanoscale to enable thermal conduction while maintaining electrical insulation. The nanoparticle size allows thermal pathways to form without creating continuous electrical conduction paths through the polymer matrix.
3Temperature
If micron-sized filler particles are used to enhance thermal conductivity, then bulk thermal performance improves, but interfacial resistance increases due to surface irregularities and filler settlement
Solution Approach 1:
The patent transitions from two-point contact between micron-sized particles to multi-point contact by introducing nanoparticles that can bridge gaps and fill surface irregularities. This dimensional change in particle size enables better interfacial contact and reduces thermal resistance at particle-particle and particle-surface interfaces.
Solution Approach 2:
Nanosized conductive particles act as intermediary elements between micron-sized filler particles and between filler particles and heat sink surfaces. These nanoparticle intermediaries improve thermal coupling by filling gaps and bridging surface irregularities that would otherwise create thermal resistance.
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 composition achieves higher thermal conductivity compared to traditional TIMs, reduces interfacial resistance, and prevents filler settlement, enabling effective heat transfer in non-electrically conductive applications without risking electrical shorts.
Implementation Method 1
electrically conductive nanoparticles in a polymer matrix, which enhances thermal conductivity while maintaining electrical isolation
Implementation Method 2
facilitate heat removal during periods of operation... Heat from the electrical circuit flows into the heat sink through the mechanical interface between the units
Data Source
AI summary
Thermal interface compositions contain both non-electrically conductive micron-sized fillers and electrically conductive nanoparticles blended with a polymer matrix. Such compositions increase the bulk thermal conductivity of the polymer composites as well as decrease thermal interfacial resistances that exist between thermal interface materials and the corresponding mating surfaces. Such compositions are electrically non-conductive. Formulations containing nanoparticles also show less phase separation of micron-sized particles than formulations without nanoparticles.