Carbonized Composite Surface Layer for Lightweight Thermal Protection
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Solution Overview
Problem
Current methods for imparting high electrical and thermal conductivity to continuous fiber reinforced polymer composites either increase material density, affect mechanical performance, or require additional weight, and existing solutions fail to maintain conductivity at high temperatures due to delamination issues.
Innovation Solution
A method involving the formation of a fiber reinforced polymer matrix composite with a surface layer of graphitized carbon, achieved by treating a portion of the composite with electromagnetic radiation to create a conductive and thermally stable surface layer integrated with the bulk composite, without the need for additional adhesives or fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive fillers are added to the polymer composite, then electrical conductivity and thermal conductivity are improved, but density increases and mechanical performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a conductive surface layer only where needed (on the composite surface) rather than distributing conductive fillers throughout the entire bulk material. This is achieved through electromagnetic radiation treatment that carbonizes the surface region selectively, providing conductivity where it is most needed for thermal protection while preserving the lightweight polymer matrix in the bulk structure.
Solution Approach 2:
The patent changes the physical-chemical parameters of the surface layer by subjecting it to electromagnetic radiation that raises the temperature to at least 800°C, transforming the polymer surface into graphitized carbon. This parameter change (temperature, chemical composition) creates a conductive surface layer with different properties from the bulk polymer, resolving the contradiction between conductivity and weight.
2Reliability
If conductive fillers are added to the polymer composite, then electrical conductivity and thermal conductivity are improved, but mechanical performance deteriorates
Solution Approach 1:
The conductive property is localized to the surface layer through electromagnetic radiation treatment, while the bulk polymer matrix retains its original mechanical properties. This spatial separation of functions (conductivity at surface, strength in bulk) resolves the contradiction between electrical conductivity and mechanical performance.
Solution Approach 2:
The patent creates a composite structure with two distinct layers: a graphitized carbon surface layer providing conductivity and a polymer matrix bulk providing mechanical strength. This composite material approach allows each layer to contribute its optimal properties without compromising the other.
3Ease of manufacture
If metal mesh is added as an element of the composition, then infusion processing techniques can be used, but weight increases and specific strength decreases
Solution Approach 1:
The polymer matrix itself is transformed into a conductive surface layer through electromagnetic radiation treatment, making the material self-conductive without requiring separate metal mesh elements. This self-service approach eliminates the need for additional conductive components while maintaining the lightweight advantage of polymer matrices.
4Reliability
If post-processing techniques such as painting or secondary application of conductive coating are used, then electrical conductivity is improved, but weight increases
Solution Approach 1:
The patent merges the structural polymer matrix with the conductive surface layer by transforming the surface of the matrix itself into graphitized carbon through electromagnetic radiation. This merging eliminates the need for separate conductive coatings or adhesives, reducing weight while maintaining conductivity.
Solution Approach 2:
The polymer composite performs the dual function of providing both structural support and electrical/thermal conductivity through its own transformed surface layer, eliminating the need for separate conductive coating materials and adhesives that would add weight.
5Strength
If conventional polymer matrix composites are used for thermal protection, then structural contribution is provided, but thermal stability at high temperatures deteriorates due to delamination
Solution Approach 1:
The patent changes the thermal stability parameter by transforming the polymer matrix surface into graphitized carbon through electromagnetic radiation treatment at temperatures of at least 800°C. This parameter change creates a thermally stable surface layer that can withstand high temperatures without delamination, while the bulk polymer matrix retains its structural properties.
Solution Approach 2:
The patent creates a composite structure with a graphitized carbon surface layer bonded to a polymer matrix bulk. This composite material provides both the thermal stability of carbon at high temperatures and the structural properties of the polymer matrix, resolving the contradiction between structural contribution and thermal stability.
6Reliability
If carbon-carbon composites are used for thermal protection systems, then thermal conductivity and high temperature stability are improved, but weight increases and production cost increases
Solution Approach 1:
The patent applies local quality by creating a carbonized surface layer only on the exterior surface of the polymer composite rather than converting the entire bulk material to carbon-carbon composite. This localized carbonization provides the thermal conductivity and high-temperature stability of carbon materials where needed at the surface, while the lightweight polymer matrix remains in the bulk, reducing overall weight.
Solution Approach 2:
The patent changes the chemical composition and thermal properties of only the surface layer through electromagnetic radiation treatment, transforming it into graphitized carbon with high thermal conductivity. This parameter change is applied selectively to the surface region, providing carbon-like thermal properties without the weight penalty of fully carbonized composite structures.
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 enhanced electrical and thermal conductivity while maintaining structural integrity, offering improved thermal protection and resistance to high temperatures without the drawbacks of increased weight or delamination.
Implementation Method 1
treating at least a portion of a first face of the polymerized fiber reinforced composite with electromagnetic radiation to raise the temperature of the portion of the first face to at least 800° C.
Implementation Method 2
produce a surface layer of graphitized carbon on the first face of the polymerized fiber reinforced composite
Data Source
AI summary
Methods of producing a fiber reinforced polymer matrix composite and a composite thermal protection system formed from the same. The method includes forming a polymerized fiber reinforced composite which including a cured thermoset polymer matrix and at least one reinforcement material. The method further includes treating at least a portion of a first face of the polymerized fiber reinforced composite with electromagnetic radiation to raise the temperature of the portion of the first face to at least 800° C. to produce a surface layer of graphitized carbon and a bulk polymerized fiber reinforced composite representing the untreated polymerized fiber reinforced composite. Further, the surface layer of graphitized carbon has an electrical conductivity of 0.25 S m−1 to 2.5 S m−1 where the electrical conductivity and a thermal conductivity are both greater than those of the bulk polymerized reinforced composite.