Silicone Potting Composition With High Thermal Conductivity and Low Viscosity
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Solution Overview
Problem
Conventional thermally conductive materials for dissipating heat from electronic components face challenges such as insufficient thermal conductivity, excessive viscosity, and difficulty in uniform application, making them unsuitable for modern high-power electronics.
Innovation Solution
A highly filled silicone-based potting material with low viscosity and high thermal conductivity, containing a liquid silicone resin and thermally conductive particulate filler, which maintains good flowability and self-leveling properties for effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermally conductive filler is increased to improve heat dissipation, then thermal conductivity is improved, but viscosity increases making the material difficult to dispense and apply uniformly
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone resin matrix, specifically using a ratio of polyorganosiloxane to organically modified polysiloxane within 90:10 to 50:50 ranges, and controlling the viscosity of the liquid silicone resin between 10-1000 cP. These parameter adjustments allow the material to maintain low viscosity even with high thermally conductive filler content (at least 90 wt.%), resolving the contradiction between thermal conductivity and ease of application.
Solution Approach 2:
The patent creates a composite material system combining liquid silicone resin with thermally conductive particulate filler (such as aluminum oxide, aluminum nitride, or boron nitride). The composite structure allows the filler particles to be evenly distributed throughout the low-viscosity silicone matrix, achieving high thermal conductivity (at least 3 W/m*K) while maintaining good flowability and dispensability.
2Temperature
If thermally conductive filler is increased to achieve high thermal conductivity, then heat dissipation is improved, but the material becomes difficult to shape and position for maximum heat transfer efficiency
Solution Approach 1:
The patent controls the viscosity parameter of the liquid silicone resin between 10-1000 cP, which provides an optimal balance between holding filler particles during application and allowing the material to flow into complex shapes. This parameter control enables the material to be easily shaped and positioned for maximum heat transfer efficiency while maintaining high thermal conductivity through adequate filler loading.
3Temperature
If conventional potting materials are used to provide thermal conductivity, then heat dissipation is achieved, but the viscosity is excessively high preventing uniform and thorough application within the heat dissipation pathway
Solution Approach 1:
The patent significantly reduces the viscosity parameter of the silicone resin matrix compared to conventional potting materials, achieving viscosities of 10-1000 cP. This parameter change enables uniform and thorough application within heat dissipation pathways, ensuring complete coverage and consistent thermal performance, while still maintaining adequate thermal conductivity through proper filler selection and distribution.
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 material achieves thermal conductivity of at least 3 W/m*K with viscosities below 500 Pa*s at various shear rates, ensuring uniform application and efficient heat dissipation.
Implementation Method 1
thermally conductive particulate filler dispersed in the liquid silicone resin in an amount of at least 90 wt. % of the potting material, wherein the potting material exhibits a thermal conductivity of at least 3 W/m*K
Data Source
AI summary
A thermally conductive silicone-based potting composition is provided that exhibits a thermal conductivity of at least 3 W/m*K and a low viscosity across a shear range. The composition is dispensable and curable to a form-stable condition.