Thermal Interface Foam Reducing Thermal Resistance
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Solution Overview
Problem
Current thermally conductive materials for electronic devices face challenges such as messy handling, high thermal resistance, and incompatibility with non-planar surfaces, particularly with greases and traditional thermal interface pads.
Innovation Solution
A thermally conductive composition comprising a blend of acrylic polymer, liquid and solid resins, and thermally conductive particles, which forms a film or tape with low viscosity and high molecular weight, providing low thermal resistance and reworkability without solvents or heat, suitable for use on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paste-like thermally conductive material is used, then thermal resistance is reduced, but handling becomes messy and difficult
Solution Approach 1:
The invention changes the physical state parameter of the thermal interface material from liquid/semi-solid paste to solid foam structure. This parameter change allows the material to maintain low thermal resistance while providing easy handling and application as a solid material that can be cut and positioned without messy spreading.
Solution Approach 2:
The invention creates a composite material structure by incorporating thermally conductive particles (such as aluminum oxide, zinc oxide, or boron nitride) into a foam matrix. This composite structure combines the low thermal resistance benefit of particle-filled materials with the handling advantages of foam structure, resolving the contradiction between thermal performance and ease of operation.
2Ease of operation
If traditional thermal interface pads are used, then handling and application are improved, but thermal resistance increases
Solution Approach 1:
The invention uses composite materials by filling the foam matrix with thermally conductive particles. This composite structure enables the pad to maintain solid foam handling advantages while achieving low thermal resistance through the high thermal conductivity of the embedded particles, thus resolving the contradiction between ease of operation and thermal performance.
Solution Approach 2:
The invention applies local quality enhancement by concentrating thermally conductive particles within the foam matrix at the thermal interface regions. This localized concentration of high thermal conductivity material ensures low thermal resistance at critical interfaces while maintaining the overall foam structure for easy handling and application.
3Reliability
If grease material is used, then thermal resistance is reduced, but application control and reworkability deteriorate
Solution Approach 1:
The invention changes the physical state from liquid grease to solid foam, fundamentally altering the application control parameter. The solid foam structure allows for precise cutting, positioning, and placement without the uncontrolled spreading characteristic of liquid greases, while reworkability is improved through the ability to remove and replace the solid pad without residue.
4Reliability
If paste material is used, then thermal resistance is reduced, but compatibility with non-planar surfaces worsens
Solution Approach 1:
The invention changes the physical structure from liquid paste to compressible solid foam. This structural parameter change enables the material to conform to non-planar surfaces through compression while maintaining intimate thermal contact, thus improving surface compatibility while preserving low thermal resistance through the foam's ability to fill surface irregularities.
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 composition offers improved handling and application ease, maintains low thermal resistance, and prevents unwanted spreading, providing effective heat dissipation with superior thermal diffusivity compared to existing materials.
Implementation Method 1
a thermally conductive thermal interface material is utilized to transfer heat from the heat-generating electronic device to a cold sink
Data Source
Figure 1
AI summary
A composition for use as a thermal interface material in a heat-generating electronic device is provided. The composition comprises a blend of acrylic polymer, one or more liquid resins, conductive filler particles and optionally one or more solid resins.