Non-Condensing Thermal Interface Materials With Low Sulfur Content
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Solution Overview
Problem
Existing thermal interface materials contain sulfur, fail condensation tests, have low thermal conductivity, and lack EMI absorbing functionality, making them unsuitable for applications requiring sulfur-free, non-condensing, and high thermal conductivity.
Innovation Solution
Development of non-condensing thermal interface materials with low sulfur content, high thermal conductivity, and EMI absorbing properties, specifically designed to be silicone-free and include functional fillers like aluminum oxide and silicon carbide, ensuring no detectable sulfur and effective thermal management and EMI mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal interface materials are used, then thermal conductivity is provided, but sulfur content becomes problematic and condensation occurs
Solution Approach 1:
The patent changes the chemical composition parameters by specifying sulfur content must be less than 2 ppm and eliminating silicone entirely. This parameter change transforms the material from conventional sulfur-containing TIMs to sulfur-free compositions that prevent sulfur interaction issues while maintaining thermal management functionality.
Solution Approach 2:
The patent employs composite material structures combining aluminum oxide particles (2-5 mm diameter) with silicone-free polymer matrices. This composite approach achieves both sulfur-free composition and high thermal conductivity (≥4.5 W/mK) by integrating thermally conductive fillers within a compatible polymer system.
2Temperature
If thermal conductivity is increased, then heat management improves, but condensation tendency increases
Solution Approach 1:
The patent changes the thermal and chemical parameters simultaneously by selecting aluminum oxide fillers with specific size distributions (2-5 mm) and combining them with silicone-free polymers having controlled thermal conductivity (≥4.5 W/mK). This parameter optimization achieves high thermal conductivity while preventing condensation through elimination of silicone-based volatile components.
3Adaptability or versatility
If sulfur content is reduced, then material compatibility improves, but manufacturing difficulty increases
Solution Approach 1:
The patent establishes specific compositional parameters (sulfur <2 ppm, silicone-free, aluminum oxide 2-5 mm) that define a targeted material class. These parameter specifications enable sulfur-free compatibility while providing clear manufacturing guidelines for producing TIMs suitable for sensitive applications like optical modules and semiconductor devices.
4Reliability
If conventional TIMs are used, then thermal interface function is provided, but EMI shielding capability is insufficient
Solution Approach 1:
The patent designs a multi-functional TIM system where the aluminum oxide-filled silicone-free polymer matrix simultaneously provides thermal conduction (≥4.5 W/mK), sulfur-free compatibility, and EMI shielding capabilities. This universal material design integrates multiple functions into a single component that addresses both thermal management and electromagnetic interference protection.
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 materials effectively conduct heat and absorb EMI emissions, passing condensation tests at elevated temperatures and ensuring optimal performance in applications where sulfur interaction is a concern, such as in the optical module industry.
Implementation Method 1
the heat may pass from the operating electrical component to the heat sink either by direct surface contact between the electrical component and heat sink and/or by contact of the electrical component and heat sink surfaces through an intermediate medium or thermal interface material (TIM)
Implementation Method 2
These shields may be composed of metal, polymer-inorganic composites, filled foams, foam materials wrapped or coated with absorbing and/or reflecting materials
Data Source
AI summary
The present disclosure relates to non-condensing thermal materials (e.g., thermal interface materials (TIMs), thermally-conductive pads, thermally-conductive EMI absorbers, etc.) with low sulfur content. In exemplary embodiments, a thermal interface material has a thermal conductivity of at least 4.5 Watts per meter per Kelvin (W/mK). The thermal interface material includes less than 50 parts per million (PPM) sulfur. And the thermal interface material is configured to be non-condensing. The thermal interface material may comprise a thermally-conductive EMI absorber; and/or the thermal interface material may be silicone free and/or have no detectable silicone.