Carbon Nanotube Thin Film Resistive Heater
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Solution Overview
Problem
Existing laminated resistive heating devices face challenges in achieving high reliability and durability, especially in harsh environments, due to issues with adhesion and interference from bulky copper leads, and the impact of solvents on carbon nanotube electrical properties.
Innovation Solution
A laminated resistive heater with a substantially polymer-free carbon nanotube layer, applied to a grooved substrate with a solventless polyurethane protective coating, and electrical leads integrated directly onto the substrate, enhancing adhesion and durability while maintaining low electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polymer-based resistive heating layer with carbon nanotube filler is used, then the heater can be manufactured using conventional coating processes, but the polymer matrix interferes with the electrical properties of carbon nanotubes and reduces reliability in harsh environments
Solution Approach 1:
The patent extracts and removes the polymer matrix from the carbon nanotube heating layer, leaving a substantially polymer-free CNT network. This extraction eliminates the harmful interference of polymer on CNT electrical properties while maintaining the manufacturability through direct deposition of CNT networks onto substrates using techniques like chemical vapor deposition or screen printing of CNT pastes.
Solution Approach 2:
The patent creates a composite structure where a carbon nanotube network is integrated directly with the substrate, eliminating the need for a polymer matrix. The CNTs form a conductive network that provides both structural integrity and heating function, with the substrate serving as the mechanical support rather than a polymer binder.
2Adaptability or versatility
If conventional laminated heater structures with multiple layers and adhesives are used, then the heater can be applied to various surfaces, but the bulky copper leads interfere with the heating performance and the adhesive layers reduce overall reliability
Solution Approach 1:
The patent merges the electrical leads directly with the carbon nanotube heating layer and substrate, eliminating separate adhesive layers and intermediate components. The CNT network serves as both the heating element and the electrical conductor, with leads attached directly to the CNT layer or substrate, reducing interface points of failure and improving overall reliability.
Solution Approach 2:
The patent employs thin-film carbon nanotube networks deposited directly onto flexible or rigid substrates, creating a lightweight, conformable heating element that can be applied to various surfaces without bulky copper leads. The thin-film CNT structure provides flexibility and adaptability while maintaining excellent electrical and thermal performance.
3Ease of manufacture
If solvents are used in the carbon nanotube dispersion or adhesive layers, then the carbon nanotubes can be properly dispersed and applied, but the solvents degrade the electrical properties of carbon nanotubes and reduce durability
Solution Approach 1:
The patent changes the processing parameters by using solvent-free or water-based CNT dispersions instead of organic solvents. The CNTs are dispersed in water or applied from the vapor phase, and the dispersion is subsequently dried to leave a pure CNT network. This parameter change eliminates solvent-induced degradation of CNT electrical properties while maintaining effective dispersion and application 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 solution provides improved adhesion, durability, and resistance to environmental hazards, maintaining low electrical resistance and effective heating performance even under harsh conditions, such as ice formation on aircraft surfaces.
Implementation Method 1
laminated resistive heater... carbon nanotube layer... electrical leads integrated directly onto the substrate, enhancing adhesion and durability while maintaining low electrical resistance
Implementation Method 2
applied to a grooved substrate with a solventless polyurethane protective coating, enhancing adhesion and durability
Data Source
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AI summary
Laminated resistive heaters comprising a carbon nanotube layer are described. The invention also includes methods of making laminated resistive heaters and applications using the resistive heaters.