Aligned Carbon Nanotube Thermal Interface Material
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Solution Overview
Problem
Conventional thermal interface materials with high heat conduction coefficients are insufficient for modern electronic components due to high thermal resistance and lack of uniform heat distribution, especially when using carbon nanotubes randomly disposed in a matrix material.
Innovation Solution
A method involving a carbon nanotube array with aligned carbon nanotubes and a phase change material, where the composite is cut to create sections with specific thicknesses and heated to allow the nanotubes to protrude, forming a flexible thermal interface material with reduced thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If carbon nanotubes are randomly disposed in a matrix material, then the thermal interface material can be easily manufactured, but the thermal conductivity is insufficient and heat distribution is non-uniform
Solution Approach 1:
The invention segments the carbon nanotube structure into vertically aligned arrays with uniform spacing, creating discrete thermal conduction pathways. This segmentation allows each nanotube to function as an independent heat conduction channel, ensuring uniform heat distribution while maintaining manufacturability through controlled growth processes
Solution Approach 2:
The invention performs preliminary alignment of carbon nanotubes during the growth phase using controlled substrate conditions and field applications. By pre-aligning the nanotubes before final assembly, the structure ensures optimal thermal conductivity pathways are established in advance, eliminating the need for post-manufacturing alignment processes
2Reliability
If the thermal interface material is made thick to incorporate sufficient carbon nanotubes, then thermal conductivity improves, but flexibility and bulk are reduced
Solution Approach 1:
The invention creates a composite structure combining vertically aligned carbon nanotubes with a supportive matrix material. This composite approach allows thin-sectioned nanotube arrays to achieve high thermal conductivity through their aligned structure, while the matrix provides mechanical flexibility and structural integrity, eliminating the need for thick materials
Solution Approach 2:
The invention transitions from random three-dimensional distribution of nanotubes to a highly organized vertical array structure. This dimensional reorganization concentrates thermal conduction pathways in the vertical direction, achieving high thermal conductivity in thin sections without requiring increased material bulk, thereby maintaining flexibility
3Reliability
If carbon nanotubes are aligned vertically, then thermal conductivity and heat distribution improve, but manufacturing complexity increases
Solution Approach 1:
The invention enables carbon nanotubes to self-align through controlled growth conditions on the substrate, utilizing inherent physical and chemical fields during synthesis. This self-organization process eliminates the need for complex post-manufacturing alignment equipment, reducing manufacturing complexity while achieving vertical alignment for optimal thermal conductivity
Solution Approach 2:
The invention controls alignment through parameter adjustments in the growth environment, such as substrate temperature, catalyst composition, and applied fields. By optimizing these parameters, vertical alignment is achieved through a controlled chemical process rather than mechanical means, simplifying the overall manufacturing complexity
4Ease of manufacture
If conventional particles are used in base material, then the thermal interface material can be easily manufactured, but the heat conduction coefficient is too low for modern applications
Solution Approach 1:
The invention changes the fundamental parameter of thermal conductivity by transitioning from conventional particle-based fillers to vertically aligned carbon nanotube arrays. This parameter change achieves heat conduction coefficients sufficient for modern electronic applications while maintaining ease of manufacture through controlled growth and assembly processes
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 method enhances thermal conductivity and flexibility, providing low thermal resistance for both high and low heat fluxes, ensuring effective heat dissipation even with uneven surfaces by aligning carbon nanotubes for direct contact between heat sources and dissipation devices.
Implementation Method 1
forming a composite phase change material by filling clearances in the carbon nanotube array with a phase change material
Implementation Method 2
heating up the section to a temperature higher than a phase change temperature of the phase change material and cooling down after the two opposite ends of the carbon nanotubes protruding out of the section
Implementation Method 3
a thermal interface material which conducts heat by using carbon nanotubes
Data Source
AI summary
A method for manufacturing a thermal interface material comprising the steps of: providing a carbon nanotube array comprising a plurality of carbon nanotubes each having two opposite ends; forming a composite phase change material by filling clearances in the carbon nanotube array with a phase change material; forming a section with predetermined thickness by cutting the composite phase change material along a direction cross to an alignment direction of the carbon nanotubes; and heating up the section to a temperature higher than a phase change temperature of the phase change material and cooling down after the two opposite ends of the carbon nanotubes protruding out of the section.