Carbon Origami Cellular Structures for Low Density High Strength
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Solution Overview
Problem
Current methods for forming carbon-based cellular structures are not economical or scalable, and they struggle to produce tailored structures with desirable characteristics for various applications.
Innovation Solution
A method involving shaping an organic polymer-based 2D sheet into a 3D precursor, followed by heat treatment at high temperatures in an inert atmosphere to form carbon-based cellular structures, which can include metal carbides or carbon nitride, allowing for the creation of structures with low density and high mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional methods are used to form carbon-based cellular structures, then production can proceed with existing processes, but the structures cannot achieve both low density and high mechanical strength simultaneously
Solution Approach 1:
The structure is divided into cellular units with struts and plates forming interconnected cells. This segmentation allows the material to achieve high specific strength through geometric efficiency while maintaining low density through the cellular architecture, resolving the contradiction between strength and weight.
Solution Approach 2:
The patent creates composite carbon structures by combining carbonized organic material with metal carbides or other reinforcements formed during heat treatment. This composite approach enables the structure to simultaneously achieve low density from the cellular architecture and high compressive strength from the reinforced carbon-metallurgical composite material.
2Productivity
If existing carbon structure formation methods are used, then production can continue with current technology, but the processes are not economical or scalable
Solution Approach 1:
The patent utilizes heat treatment parameter changes (temperature, atmosphere composition, duration) to transform organic precursor materials into carbon-based cellular structures with desired properties. By controlling parameters such as heat treatment temperature and nitrogen atmosphere composition, the process achieves scalable production of tailored carbon structures with specific mechanical and physical characteristics.
Solution Approach 2:
The patent employs organic precursor materials as intermediaries that are subsequently transformed into final carbon structures through heat treatment. This intermediary approach enables scalable production because organic precursors can be manufactured economically and processed through controlled heat treatment to produce the desired carbon-based cellular structures with tailored properties.
3Weight of moving object
If cellular structures are designed with lower density, then weight reduction is achieved, but mechanical strength typically decreases
Solution Approach 1:
The patent applies local quality by varying the material composition and structure at different locations within the cellular framework. Metal carbides or other reinforcements are selectively formed in specific regions during heat treatment, creating localized strength enhancements in critical load-bearing areas while maintaining low overall density through the cellular architecture.
Solution Approach 2:
The composite carbon-metallurgical structure enables low density to be maintained while achieving high compressive strength through the synergistic combination of lightweight cellular architecture and high-strength reinforcement phases distributed throughout the structure.
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 enables the production of carbon-based cellular structures with very low densities and high compressive strength, exhibiting elastic moduli comparable to or exceeding those of other lightweight materials, such as carbon nanotube foams and graphene elastomers.
Implementation Method 1
heat treating the shaped precursor at a temperature of about 600° C. or greater in inert atmosphere, the heat treatment can carbonize and densify the organic material of the precursor
Implementation Method 2
During the heat treatment step, the metal of the metal precursor can react with carbon of the 3D precursor to form a reaction product, e.g., a metal carbide
Implementation Method 3
the heat treatment can carbonize and densify the organic material of the precursor
Data Source
AI summary
Methods for forming carbon-based cellular structures and 3D structures that can be formed by use of the methods are described. Methods include shaping an essentially 2D sheet that includes an organic polymer to form a 3D precursor followed by heat treatment of the 3D precursor. Heat treatment carbonizes the polymer to form an amorphous carbon. A metal precursor solution can be applied to the 3D precursor, and subsequent heat treatment can form a metal carbide, metal nanoparticles, or other carbon-based materials on/in the cellular structures.