Fused Graphite-Metal Sheet for Heat Dissipation and EMI Shielding

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Solution Overview

Problem

Conventional graphite heat dissipation sheets for electronic equipment face challenges such as cracking and damage from external forces, leading to reduced heat dissipation performance and high production costs, especially in large-area applications, due to their sensitivity to handling and installation requirements.

Innovation Solution

A fused sheet is developed by integrating a premolded graphite substrate with an incomplete crystal structure onto a porous metal sheet using high-pressure press molding, eliminating the need for adhesive resins and creating a physically firm bond, while also incorporating a heat dissipation film layer for enhanced thermal conductivity and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a graphite heat dissipation sheet is used for electronic equipment, then heat dissipation performance is improved, but the sheet is sensitive to external forces causing cracking and damage

Engineering Contradiction:

Improveheat dissipation performanceVSAvoiddurability under external forces

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies composite materials by combining graphite substrate with adhesive resin layer and protective layers. The graphite substrate provides heat dissipation performance while the adhesive resin layer and protective layers provide mechanical strength and resistance to external forces, preventing cracking and damage while maintaining thermal conductivity.

Inventive Principle:

Principle #40Composite materials

2Temperature

If conventional graphite sheets are used, then heat dissipation is achieved, but production costs increase due to sensitivity to handling and installation

Engineering Contradiction:

Improveheat dissipationVSAvoidproduction cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by pre-coating the graphite substrate with adhesive resin and protective layers during manufacturing. This preliminary preparation eliminates the need for separate handling and installation precautions, reducing production complexity and costs while maintaining heat dissipation performance.

Inventive Principle:

Principle #10Preliminary action

3Strength

If graphite substrate is pressed with high pressure, then bonding strength is improved, but crystal structure may be damaged

Engineering Contradiction:

Improvebonding strengthVSAvoidcrystal structure integrity

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by optimizing pressing pressure and temperature parameters within specific ranges. By controlling pressure to not exceed certain limits and maintaining appropriate temperature, the adhesive resin cures properly to provide bonding strength while the graphite crystal structure remains intact and undamaged.

Inventive Principle:

Principle #35Parameter changes

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 solution provides improved durability and heat dissipation performance by preventing graphite substrate separation and maintaining structural integrity under external forces, enabling efficient electromagnetic wave absorption and shielding, and facilitating mass production for large-area applications.

Implementation Method 1

fine pores of a porous metal sheet absorb electromagnetic waves to convert and extinct thermal energy through diffused reflection

Methodology Applied

Scientific EffectDiffused reflection: Reflection

Implementation Method 2

press molding a graphite substrate to prepare a premolded graphite sheet having an incomplete state of crystal structure, and adhering and pressing a porous metal sheet having pores formed by sintering, electrolysis casting or the like to one surface of the graphite sheet to be integrally combined and molded

Methodology Applied

Scientific EffectImpregnation: Permeation

Data Source

PatentUS11052636B2Fused sheet for electromagnetic wave absorption-extinction and shielding, and for electronic equipment high heat dissipation, and method of manufacturing the same

Publication Date: 2021.07.06 JOO HAK SIK

AI summary

The present invention discloses a fused sheet for electromagnetic wave absorption/extinction and shielding, and for electronic equipment high heat dissipation. The fused sheet for electromagnetic wave absorption/extinction and shielding, and for electronic equipment high heat dissipation of the present invention includes a premolded graphite sheet prepared by molding a graphite substrate into a sheet form having a density in a range of 0.1-1.5 g/cm3 and an incomplete state of crystal structure; and a porous metal sheet having a plurality of pores connected to upper and lower surfaces of the porous metal sheet, wherein the premolded graphite sheet is stacked on one surface of the porous metal sheet, and press molded to be integrally attached and combined, so as to have a density of 1.6 g/cm3-6.0 g/cm3.