CNT/CNF Array Thermal Resistance Reduction via Compressive Loading
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Solution Overview
Problem
Current carbon nanotube and carbon nanofiber-based materials for thermal management in integrated circuits face challenges in achieving commercially attractive, functionally reliable, and environmentally durable products due to inconsistencies in thermal conductivity and mechanical properties, particularly in evaluating Young's modulus and bonding strength.
Innovation Solution
A method and apparatus for evaluating and improving the mechanical and thermal properties of carbon-nanotube and carbon nanofiber arrays by measuring Young's modulus through axial compressive force, applying compressive loads to increase modulus and reduce thermal resistance, using rapid thermal annealing to enhance material quality, and developing an analytical stress model to predict interfacial shearing stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If compressive load is applied to increase Young's modulus, then mechanical strength is improved, but thermal resistance increases
Solution Approach 1:
The patent applies rapid thermal annealing to change the physical and chemical parameters of the CNT/CNF array, improving material quality and reducing thermal resistance while maintaining the mechanical strength gains from compressive loading
Solution Approach 2:
The patent employs multiple repeated compressive loads to continuously improve the Young's modulus of the CNT/CNF array, ensuring sustained mechanical enhancement without significant thermal resistance penalty when combined with thermal annealing
2Reliability
If rapid thermal annealing is applied to improve material quality, then thermal conductivity is improved, but processing complexity increases
Solution Approach 1:
The patent uses periodic rapid thermal annealing cycles to progressively improve material quality and reduce thermal resistance, achieving better results through repeated short-duration treatments rather than a single complex processing step
3Strength
If multiple repeated compressive loads are applied to increase Young's modulus, then mechanical properties are improved, but thermal resistance increases
Solution Approach 1:
The patent uses rapid thermal annealing to change the thermal and mechanical parameters of the CNT/CNF array, reducing thermal resistance and improving material quality to compensate for the thermal resistance increase from mechanical loading
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
This approach allows for the standardization of Young's modulus evaluation and adhesive strength assessment, improving the mechanical and thermal performance of CNT/CNF arrays, making them more suitable as thermal interface materials by enhancing Young's modulus and reducing thermal resistance.
Implementation Method 1
a plurality of individually separated, rod-like nano-structures are disposed between the heat sink surface and the heat generating surface... The rod-like nano-structures remove heat from the integrated circuit device
Implementation Method 2
the application of rapid thermal annealing to improve the quality of the CNT/CNF material and to reduce the interfacial thermal resistance
Implementation Method 3
The Young's modulus of a CNT/CNF material is measured by applying an axial compressive force on the CNT/CNF array and measuring the applied forces and the induced displacements
Data Source
AI summary
A method and apparatus for the evaluation and improvement of the mechanical and thermal properties of carbon-nanotube (CNT) and carbon nanofiber (CNF) arrays grown on a substrate is disclosed. The Young's modulus of a CNT/CNF material is measured by applying an axial compressive force on the CNT/CNF array and measuring the applied forces and the induced displacements. Also disclosed are the evaluation of the nonlinear stress-strain relationship of the CNT/CNF material, increasing of the Young's modulus and decreasing the thermal resistance by application of a compressive load, the application of rapid thermal annealing to improve the quality of the CNT/CNF material and to reduce the interfacial thermal resistance, improvement of the bonding strength of the CNT/CNF array to a substrate, evaluation of the bonding strength of the CNT/CNF array to a substrate, evaluation of the shearing force at failure, and an analytical stress model that enables one to predict the interfacial shearing stress from the measured force.