Composite Thermal Protection Layer Adhesion
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Solution Overview
Problem
High performance composite components face mechanical performance degradation due to polymer matrix softening under high thermal energy, with existing thermal protection methods being costly, cumbersome, or prone to delamination issues.
Innovation Solution
A method involving a composite component with a primary fibre material and a primer layer of alternative fibre material, integrated into the component, followed by a metallic bonding layer and a ceramic or metallic thermal protection layer to enhance adhesion and thermal insulation, reducing the risk of delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If higher Tg resins are used to increase heat resistance, then thermal protection is improved, but composite cost increases
Solution Approach 1:
The thermal protection system is segmented into multiple functional layers: a primer layer integrated into the composite, a metallic bonding layer, and a ceramic thermal protection layer. This segmentation allows each layer to perform its specific function optimally while using cost-effective materials rather than requiring the entire composite to use expensive high-Tg resins.
Solution Approach 2:
The invention uses a composite thermal protection system combining organic primer material with inorganic metallic and ceramic layers. This multi-material composite approach provides superior thermal protection compared to using only high-Tg resins, while being more cost-effective than alternative protection methods.
2Temperature
If metallic or ceramic protective coatings are adhesively bonded to composite surfaces, then thermal protection is provided, but delamination occurs due to poor bonding
Solution Approach 1:
A primer layer serves as an intermediary between the composite substrate and the metallic bonding layer. This primer layer is chemically and mechanically compatible with both the composite and the metal, creating strong interfacial bonding and preventing delamination. The primer acts as a mediator that bridges the incompatible surfaces.
Solution Approach 2:
The primer layer modifies the surface parameters of the composite, changing its chemical composition and surface energy to improve wettability and adhesion. This parameter change enables strong bonding between the composite and the metallic thermal protection layer.
3Temperature
If a metallic heat shield is spaced apart from the composite surface to provide an air gap, then thermal protection is achieved, but additional space is required
Solution Approach 1:
The thermal protection system uses thin film-like layers (primer layer integrated into the composite and thin metallic and ceramic coatings) to provide thermal protection without requiring significant space. This thin-film approach eliminates the need for bulky air gaps while maintaining effective thermal protection.
Solution Approach 2:
The primer layer is merged with the composite component during manufacturing, integrating the thermal protection system into the component structure itself. This merging eliminates the need for separate heat shields and additional spacing, as the protection layers become an integral part of the composite component.
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
Significantly improves adhesion strength between the composite component and thermal protection layers, enhancing mechanical performance and thermal protection while preventing delamination, as demonstrated by increased adhesion testing results.
Implementation Method 1
applying a ceramic thermal protection layer to the bonding surface for insulating the thermal exposure area
Implementation Method 2
for reflecting external thermal energy
Data Source
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Figure 6~7
AI summary
A method of producing a composite component (10) having a thermal protection layer (24) including the steps of: providing a composite component (10) with a primary fibre material (12) and with a primer layer (16) of alternative fibre material overlying the primary fibre material (12) at an area of the composite component intended for high thermal exposure, said area defining a thermal exposure area (18); applying a metallic bonding layer (22) to the primer layer (16) of the thermal exposure area (18) to create a bonding surface at the thermal exposure area (18); and applying a ceramic thermal protection layer (24) to the bonding surface for insulating the thermal exposure area (18) and/or for reflecting external thermal energy, the thermal protection layer (24) having a higher melting point than the metallic bonding layer (22).