Gallium Thermal Interface Composition for Low-Resistance Heat Transfer
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Solution Overview
Problem
Conventional thermally conductive materials fail to provide sufficient thermal conductivity and workability for high heat-generating electronic components, and the use of base oils like polyorganosiloxanes and hydrocarbon-based synthetic oils can lower thermal conductivity.
Innovation Solution
A thermally conductive composition comprising gallium and/or its alloys with specific particle diameters blended with metal oxides and/or metal nitrides, along with hydrophobic spherical silica fine particles and an organosilane, to enhance thermal conductivity and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sheet-like thermally conductive materials are used, then ease of handling is improved, but interfacial thermal resistance increases due to spaces at interfaces
Solution Approach 1:
The patent changes the physical state parameter of the thermally conductive material from solid sheet to paste-like form, enabling it to flow and conform to surface irregularities. This parameter change allows the material to eliminate air gaps at interfaces while maintaining ease of application, thereby reducing interfacial thermal resistance without sacrificing handling properties
Solution Approach 2:
The patent employs the fluidity characteristic of paste-like materials (similar to hydraulic principles) to allow the thermally conductive composition to flow into and fill surface unevenness and micropores at interfaces. This fluid behavior ensures complete contact between mating surfaces, eliminating voids and reducing thermal resistance while maintaining easy applicability
2Ease of operation
If base oils such as polyorganosiloxanes or hydrocarbon-based synthetic oils are used, then workability is improved, but thermal conductivity is lowered
Solution Approach 1:
The patent extracts and removes base oils (polyorganosiloxanes and hydrocarbon-based synthetic oils) from the thermally conductive composition formulation. By eliminating these low thermal conductivity components, the invention prevents them from acting as thermal barriers between filler particles, thereby maintaining high thermal conductivity while retaining adequate workability through the silicone resin-based system
Solution Approach 2:
The patent replaces conventional base oils with a silicone resin-based system that, while having different properties, provides sufficient workability for a reasonable service life. The composition is designed to be applied as needed and maintains its functional properties throughout the intended operational period, sacrificing the long-term stability of oil-based systems for superior thermal performance
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 achieves thermal conductivity of 70 W/m·K or higher with improved workability, effectively dissipating heat from electronic components by conforming to surface unevenness and preventing interfacial thermal resistance.
Implementation Method 1
a thermally conductive composition having an improved workability and a high thermal conductivity of 30 W/m·K or higher by blending gallium and/or a gallium alloy with a metal oxide and/or metal nitride having a specific particle diameter
Implementation Method 2
the paste-like heat dissipation material comes into close contact with the two, thereby reducing the interfacial thermal resistance
Data Source
Figure 1~2
AI summary
Provided is a thermally conductive composition that is excellent in thermal conductivity and also excellent in workability as well. The thermally conductive composition comprises: (A) 100 parts by mass of gallium and/or an alloy thereof having a melting point of -20 to 100°C; and (B) 2 to 150 parts by mass of a metal oxide and/or metal nitride having an average particle diameter of 0.01 µm to 200 µm with respect to 100 parts by mass of the component (A), wherein the total content of the components (A) and (B) in the composition is 95 to 100% by mass. In the thermally conductive composition, the gallium alloy serving as the component (A) includes one or more selected from Ga-In alloys, Ga-Sn-Zn alloys, Ga-In-Sn alloys, and Ga-In-Bi-Sn alloys.