Carbonized Composite Surface Layer for Conductive Thermal Protection
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Solution Overview
Problem
Existing methods for imparting high electrical and thermal conductivity to continuous fiber reinforced polymer composites result in increased density, reduced mechanical performance, and weight, while conventional solutions like conductive fillers or metal meshes add parasitic weight and risk delamination at high temperatures.
Innovation Solution
A method involving selective carbonization of a thermoset polymer matrix composite using electromagnetic radiation to form a surface layer of graphitized carbon, which integrates electrical and thermal conductivity without adding weight, maintaining structural integrity.
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 extracts the carbonization process from the bulk composite and applies it selectively to the surface layer. By carbonizing only the surface (0.5-5mm depth) rather than the entire composite, the method achieves high electrical and thermal conductivity where needed while preserving the mechanical properties of the bulk polymer matrix.
Solution Approach 2:
The patent creates a surface layer with fundamentally different properties (graphitized carbon) than the bulk material (polymer matrix). This local quality change provides high conductivity at the surface while maintaining the structural integrity and mechanical performance of the underlying polymer composite.
2Ease of manufacture
If metal mesh is added to enable infusion processing, then processing capability is improved, but weight increases and specific strength reduces
Solution Approach 1:
The patent uses the polymer matrix itself as the carbon source for creating the conductive surface layer. Through controlled carbonization, the polymer converts to graphitized carbon in situ, eliminating the need for separate metal meshes or conductive additives while maintaining processing capability and reducing weight.
3Reliability
If conductive coating is applied post-processing, then electrical conductivity is improved, but weight increases
Solution Approach 1:
The patent merges the structural polymer matrix with the conductive carbon layer by converting the polymer itself into carbon through controlled carbonization. This eliminates the need for separate coating layers and their associated weight penalties, as the conductive layer becomes an integral part of the composite structure.
4Temperature
If conventional carbon-carbon composite is used for thermal protection, then thermal conductivity is improved, but weight increases and production cost increases
Solution Approach 1:
The patent creates a gradient structure where only the surface layer (0.5-5mm) is carbonized to provide thermal protection, while the bulk remains as lightweight polymer composite. This local quality change achieves high-temperature resistance without the weight penalty of fully carbonized carbon-carbon composites.
Solution Approach 2:
The patent creates a hybrid composite structure combining graphitized carbon surface layer with polymer matrix bulk. This composite approach provides the thermal protection of carbon-carbon composites at the surface while maintaining the lightweight advantages of polymer composites in the bulk 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 produces a fiber reinforced polymer matrix composite with enhanced electrical and thermal conductivity, retaining mechanical properties, suitable for high-temperature applications and thermal protection systems.
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.