Anisotropic Thermal Interface Material for Lower Thermal Impedance
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Solution Overview
Problem
Conventional thermal interface materials (TIMs) face challenges in efficiently conducting heat due to factors like surface roughness, adhesive properties, and material alignment, leading to high thermal impedance and reduced effectiveness in heat management for electronic components.
Innovation Solution
A composite thermal interface material comprising a bulk layer with anisotropically aligned filler particles and adhesive layers, optimized for directional thermal conductivity, which includes a combination of acrylic rubber, plasticizer particles, and ceramic filler particles, enhancing heat transfer by aligning filler particles in a specific direction to maximize thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal interface materials are used, then manufacturing is simple, but thermal impedance is high and heat conduction is poor
Solution Approach 1:
The patent uses a composite material system consisting of a polymer matrix combined with thermally conductive filler particles (such as aluminum oxide, aluminum nitride, or boron nitride). This composite structure achieves high thermal conductivity while maintaining the flexibility and ease of application characteristic of conventional TIMs, thereby resolving the contradiction between heat conduction efficiency and material complexity.
Solution Approach 2:
The patent implements anisotropic thermal conductivity by aligning filler particles in specific orientations within the polymer matrix. The filler particles are arranged to create preferential thermal conduction pathways in the direction of heat flow, while the bulk material maintains its conformability. This local optimization of thermal properties resolves the contradiction by providing high thermal conductivity where needed without requiring complex overall material structures.
2Reliability
If filler particles are randomly distributed, then material is easy to manufacture, but thermal conductivity is reduced due to poor heat transfer paths
Solution Approach 1:
The patent employs preliminary alignment of filler particles during the material fabrication process, using techniques such as extrusion through oriented dies or application under controlled stress. This pre-alignment creates preferential thermal conduction pathways before the material is applied, ensuring high thermal conductivity without requiring complex post-application adjustments or precise positioning during installation.
Solution Approach 2:
The patent utilizes changes in physical parameters during processing (such as applied stress, temperature, or pressure) to induce filler particle alignment. By controlling these parameters during manufacturing, the material achieves anisotropic thermal conductivity with optimized heat transfer paths, resolving the contradiction between thermal conductivity and manufacturing precision requirements.
3Strength
If adhesive layers are added to improve bonding, then surface attachment is improved, but thermal impedance increases due to additional material layers
Solution Approach 1:
The patent integrates adhesive functionality directly into the thermal interface material body, creating a multi-functional material that provides both thermal conduction and adhesive bonding in a single layer. This eliminates the need for separate adhesive layers, thereby maintaining low thermal impedance while achieving strong bonding strength through the unified material design.
Solution Approach 2:
The patent merges the adhesive and thermal interface functions into a single integrated material system. The polymer matrix is formulated to exhibit both adhesive properties (for bonding to substrates) and high thermal conductivity (for heat transfer). This consolidation eliminates the thermal barrier that would be introduced by separate adhesive layers, resolving the contradiction between bonding strength and thermal impedance.
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 solution significantly reduces thermal impedance, improves heat conduction, and maintains performance across varying temperatures, making it more effective than competitive products in managing heat in electronic components.
Implementation Method 1
the first filler particles are substantially aligned in a first direction... optimized for directional thermal conductivity... maximize thermal conductivity
Implementation Method 2
A first adhesive layer is disposed on a first side of the bulk material... adhesive properties
Data Source
AI summary
A thermal interface material that conducts heat is disclosed. The thermal interface includes a bulk layer and at least one adhesive layer. The bulk layer includes a first acrylic rubber, plasticizer particles, and first filler particles, and the first filler particles are substantially aligned in a first direction. The first adhesive layer is disposed on a first side of the bulk material. The first adhesive layer has a greater tackiness than the bulk material. The first adhesive layer comprises a second acrylic rubber. The first direction is substantially perpendicular to a first surface of the first side on which the first adhesive layer is disposed.