Form-Stable Conductive Gap Filler for Thermal Management
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Solution Overview
Problem
Current thermal interface materials for electronic components face challenges in efficiently dissipating heat due to air pockets and irregular surface contacts, requiring additional layers or clamping forces, which increase manufacturing costs and complexity.
Innovation Solution
A thermally and/or electrically-conductive compound is developed, comprising a cured polymer gel component blended with a curable resin and conductive particulates, allowing for dispensable, form-stable, and conformable application as a bead or mass to fill gaps between surfaces, providing a conductive pathway with low clamping force requirements and automated dispensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermal interface materials (silicone grease or wax) are used to fill surface irregularities and eliminate air pockets, then heat transfer efficiency is improved, but the materials are not self-supporting at room temperature and are messy to apply
Solution Approach 1:
The patent changes the physical and chemical parameters of the interface material by using a fully-cured polymer gel that remains stable and self-supporting at room temperature, unlike traditional greases or waxes that require substrates or clamping. This parameter change enables the material to be both effective for heat transfer and easy to handle during application.
Solution Approach 2:
The patent employs a composite material system consisting of a cured polymer gel blended with a curable resin and filled with thermally-conductive particulates. This composite structure provides both the self-supporting mechanical properties needed for easy handling and the thermal conductivity required for efficient heat transfer, resolving the contradiction between reliability and ease of operation.
2Ease of operation
If a substrate, web, or carrier is provided to support the interface material for ease of handling, then ease of operation is improved, but another interface layer is introduced in which additional air pockets may be formed
Solution Approach 1:
The fully-cured polymer gel interface material is self-supporting and self-adhering at room temperature, eliminating the need for external substrates, webs, or carriers. The material serves itself by maintaining its structural integrity and adhering to the mating surfaces without requiring additional support layers, thus avoiding the introduction of extra air pockets while maintaining ease of handling.
3Reliability
If heavy fastening elements such as springs or clamps are used to apply enough force to conform sheet-like materials to interface surfaces, then heat transfer efficiency is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent changes the mechanical properties of the interface material by using a fully-cured gel that is inherently conformable and self-adhering at room temperature. This parameter change eliminates the need for heavy fastening elements like springs or clamps, as the material itself provides the necessary conformability and adhesion, thereby reducing device complexity and manufacturing costs while maintaining heat transfer efficiency.
4Adaptability or versatility
If manual hand application or lay-up is used to apply interface materials, then adaptability is improved, but productivity decreases
Solution Approach 1:
The patent changes the rheological and adhesive parameters of the interface material by using a fully-cured gel with controlled viscosity and adhesion properties. This allows the material to be easily dispensed through automated equipment such as nozzles or screens while maintaining the ability to conform to various surface geometries, thereby increasing productivity without sacrificing adaptability.
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 compound effectively enhances heat transfer efficiency and EMI shielding while being self-supporting, easy to handle, and requiring no refrigeration or special storage, with unlimited shelf-life and fast assembly, offering robust thermal management with reduced manufacturing costs.
Implementation Method 1
The curable resin component may then be subjected to conditions which cause it to undergo further polymerization or cross-linking, or other like chemical or physical change
Implementation Method 2
a thermally-conductive, electrically-insulating material often is interposed between the heat sink and electronic component to fill in any surface irregularities and eliminate air pockets
Data Source
Figure 1~3
AI summary
Application of a thermally and/or electrically conductive compound to fill a thermal and/or EMI shielding gap between a first and a second surface. A supply of a fluent, form-stable compound is provided as an admixture of a cured polymer gel component, and a particulate filler component. An amount of the compound is dispensed from a nozzle, screen, stencil, or other orifice under an applied pressure onto one of the surfaces which, when opposed, form the gap, or into the gap formed between the surfaces. The gap is at least partially filled by at least a portion of the dispensed compound.