Oriented Graphene Fiber Sheet Device
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Solution Overview
Problem
Conventional thermally conductive sheets filled with inorganic powders fail to meet the increasing demand for improved heat dissipation due to low thermal conductivity and poor temperature resistance, negatively impacting flexibility and stability.
Innovation Solution
A device for preparing a thermally conductive sheet with graphene fibers in an oriented arrangement, using a combination of molds and processing steps to achieve high thermal conductivity by orderly orienting carbon materials like carbon fibers and graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional filler powders (alumina, aluminum nitride, boron nitride) are used to fill thermally conductive sheets, then the sheets can be manufactured with conventional processes, but the thermal conductivity remains lower than 10 W/m·k and temperature resistance is poor
Solution Approach 1:
The invention changes the material parameter from traditional powder fillers to carbon fiber fillers, which have inherently higher thermal conductivity and temperature resistance. This parameter change enables the thermally conductive sheet to achieve thermal conductivity greater than 10 W/m·k while maintaining excellent temperature resistance and stability.
Solution Approach 2:
The invention uses composite materials by combining carbon fiber fillers with a matrix material to create a new thermally conductive sheet. The carbon fiber composite structure provides both high thermal conductivity and superior temperature resistance, resolving the contradiction between thermal performance and reliability.
2Temperature
If a large amount of inorganic powder is filled in thermally conductive sheets, then the thermal conductivity can be increased to some extent, but the flexibility, toughness and elasticity of the pad are negatively impacted
Solution Approach 1:
The invention changes the filler material from rigid inorganic powder to carbon fiber, which has different mechanical properties. Carbon fiber provides thermal conductivity enhancement while maintaining better flexibility and toughness compared to traditional inorganic powders, thus resolving the contradiction between thermal performance and mechanical strength.
3Temperature
If thermally conductive sheets are made with thermal conductivity exceeding 8 W/m·k using traditional fillers, then higher heat dissipation is achieved, but temperature resistance and stability become poor
Solution Approach 1:
The invention changes the filler material parameter to carbon fiber, which inherently possesses both high thermal conductivity and excellent temperature resistance. This material parameter change allows the sheet to achieve thermal conductivity >10 W/m·k while simultaneously maintaining superior temperature resistance and compositional stability.
Solution Approach 2:
The carbon fiber composite material provides a synergistic effect where the carbon fiber network structure enables high thermal conductivity pathways while the material's inherent stability ensures excellent temperature resistance, resolving the contradiction between thermal performance and compositional stability.
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
Significantly enhances thermal conductivity of the thermally conductive sheet, achieving conductivities up to 18 W/m·k, while maintaining flexibility and stability, surpassing the limitations of traditional powder-filled sheets.
Implementation Method 1
The first mold is configured to press a first cuboid block, and the second mold is configured to repeatedly press the first cuboid block pressed by the first mold
Data Source
AI summary
A device for preparing a thermally conductive sheet with graphene fibers in an oriented arrangement includes a first mold and a second mold. The first mold is configured to press a first cuboid block, and the second mold is configured to repeatedly press the first cuboid block. The first mold is provided with a first mold groove. A first mold cover covers an opening end of the first mold groove, and the first mold cover and the first mold are configured to press the first cuboid block. A second mold groove is arranged on one side of the second mold, and a second mold cover is arranged at an opening end of the second mold groove. A movable thickness limiting block is arranged at a side of the second mold cover adjacent to the second mold groove, and is configured to be clamped in the second mold groove.