Electromagnetic Wave Absorbing Heat Conductive Sheet Design
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Solution Overview
Problem
Current electromagnetic wave absorbing heat conductive sheets face challenges in achieving sufficient heat conductivity and electromagnetic wave absorption, with existing solutions either compromising on heat dissipation or electromagnetic noise suppression.
Innovation Solution
An electromagnetic wave absorbing heat conductive sheet comprising a polymer matrix, oriented fibrous heat conductive filler, and magnetic powder, with specific volume ratios and orientation angles to enhance both heat conductivity and electromagnetic wave absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal heat dissipation components are used, then heat conductivity is improved, but electromagnetic wave absorption deteriorates
Solution Approach 1:
The patent uses a composite material consisting of magnetic powder (for electromagnetic wave absorption) and heat conductive filler (for heat dissipation) dispersed in a resin matrix. This composite structure allows simultaneous achievement of electromagnetic wave absorption and heat conductivity without using pure metal components that would reflect or transmit electromagnetic waves.
Solution Approach 2:
The patent optimizes the volume ratio of magnetic powder to heat conductive filler, and controls the particle size and shape of these fillers, to achieve both sufficient electromagnetic wave absorption and adequate heat conductivity. By adjusting these parameters, the material balances its dual functions effectively.
2Object-affected harmful factors
If magnetic powder is added to heat conductive sheet, then electromagnetic wave absorption is improved, but heat conductivity deteriorates
Solution Approach 1:
The patent creates a composite material where magnetic powder and heat conductive filler coexist in a resin matrix. The heat conductive filler (such as metal particles or ceramic particles) compensates for the heat conductivity reduction caused by magnetic powder, while the magnetic powder provides electromagnetic wave absorption. Both functions are achieved simultaneously through proper material composition.
Solution Approach 2:
The patent distributes magnetic powder and heat conductive filler throughout the resin matrix in specific volume ratios, creating regions with optimized local properties. The heat conductive filler forms conductive networks or pathways that maintain heat transfer capability even in the presence of magnetic powder particles.
3Object-affected harmful factors
If fibrous conductive carbon content is increased, then electromagnetic wave absorption is improved, but sheet uniformity deteriorates
Solution Approach 1:
The patent optimizes the volume ratio of fibrous conductive carbon to other fillers (set to 3-10:50-70), and controls the fiber length, diameter, and orientation of the carbon fibers. These parameter optimizations ensure sufficient electromagnetic wave absorption while preventing excessive fiber aggregation that would compromise sheet uniformity and processing.
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 sheet achieves superior heat conductivity and electromagnetic wave absorption, effectively dissipating heat and suppressing electromagnetic noise, as demonstrated by increased transmission absorption rates at various frequencies.
Implementation Method 1
a fibrous heat conductive filler oriented in one direction
Implementation Method 2
electromagnetic wave absorption and heat conduction characteristics at the same time by means of a magnetic wave absorption effect of the soft magnetic powder
Data Source
AI summary
Disclosed is an electromagnetic wave absorbing heat conductive sheet having superior heat conductivity and electromagnetic wave absorbency. The electromagnetic wave absorbing heat conductive sheet comprises a polymer matrix component; a magnetic metal power; and a fibrous heat conductive filler oriented in one direction.