Graphite Complex Direct Joining for Thermal Conductance
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Solution Overview
Problem
Conventional graphite sheets used for heat dissipation in electronic devices face limitations in increasing thermal conductance due to the low conductivity of adhesives in laminated structures and the tendency of expanded graphite sheets to delaminate, making it difficult to enhance thermal conductance effectively.
Innovation Solution
A graphite complex is formed by directly joining a pyrolytic graphite sheet made by firing a polymer film with a graphite layer containing graphite powder, eliminating the need for adhesives and preventing delamination, thereby increasing thermal conductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pyrolytic graphite sheets are laminated via adhesive agent to increase thermal conductance, then the thermal conductance can be increased by increasing thickness, but the extremely low thermal conductivity of adhesive agent hinders sufficient increase in thermal conductance
Solution Approach 1:
The patent removes the adhesive agent from the lamination structure, directly joining pyrolytic graphite sheets to eliminate the thermal conductivity barrier that adhesive agents create at interfaces, thereby resolving the contradiction between increasing thickness for higher thermal conductance and the harmful effect of low thermal conductivity at adhesive interfaces
Solution Approach 2:
The patent combines multiple pyrolytic graphite sheets into a laminated structure without adhesive agents, creating a direct contact interface that merges the high thermal conductivity properties of graphite across multiple layers, achieving sufficient thermal conductance increase without the harmful low thermal conductivity of adhesives
2Strength
If expanded graphite sheet thickness is increased to increase thermal conductance, then thermal conductance can be increased, but the expanded graphite sheet is likely to delaminate and is difficult to handle
Solution Approach 1:
The patent uses pyrolytic graphite sheets which have superior dimensional stability and resistance to delamination compared to expanded graphite sheets, sacrificing the lower cost of expanded graphite for the reliability and handleability of pyrolytic graphite, enabling increased thickness without delamination issues
Solution Approach 2:
The patent creates a composite structure of multiple pyrolytic graphite sheets laminated together, combining the dimensional stability and delamination resistance of pyrolytic graphite with the thermal conductance benefits of increased thickness, resolving the contradiction between thermal conductance increase and delamination prevention
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 direct contact between the pyrolytic graphite sheet and the graphite layer enhances thermal conductivity without reducing it at the interface, allowing for a graphite complex with increased thermal conductance and improved handleability, suitable for electronic devices.
Implementation Method 1
a pyrolytic graphite sheet made by firing a polymer film; the direct contact between the pyrolytic graphite sheet and the graphite layer enhances thermal conductivity
Implementation Method 2
the temperature of a heat spot is reduced by promptly diffusing the heat of the heat generating body via a graphite sheet
Data Source
AI summary
A graphite complex has a pyrolytic graphite sheet and a graphite layer. The pyrolytic graphite sheet is made by firing a polymer film. The graphite layer contains graphite powder as the main ingredient and is directly joined to the pyrolytic graphite sheet.