Carbon Fiber Insulation with Pyrolytic Carbon Surface for Particle Control
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Solution Overview
Problem
Thermal insulation materials using carbon fibers face issues with particle generation due to oxidation and mechanical friction, leading to a decrease in thermal insulation performance, and the use of a thermosetting resin intermediate layer can compromise the material's thickness and effectiveness.
Innovation Solution
A thermal insulation material comprising a covering layer of pyrolytic carbon and a base layer of carbon-based particles is developed, where the carbon fibers are exposed at the surface, bonded with a carbon-based adhesive, and formed using a chemical vapor deposition method to prevent particle diffusion and maintain insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thermosetting resin intermediate layer is used between the carbon fiber molded body and the pyrolytic carbon film, then the bonding strength is improved, but the thermal insulation thickness is reduced due to resin penetration
Solution Approach 1:
The invention removes the thermosetting resin intermediate layer from the structure, extracting the harmful element that causes resin penetration into the carbon fiber molded body. Instead, it uses a slurry coating layer that does not penetrate the carbon fibers, thereby maintaining both bonding strength and thermal insulation thickness without the negative effects of resin infiltration.
Solution Approach 2:
The invention changes the material parameter of the intermediate layer from thermosetting resin to a slurry composition containing specific solvents and binders. This parameter change allows the coating to adhere to the carbon fiber surface without penetrating the fiber structure, thus preserving the thermal insulation thickness while still providing adequate bonding strength for the pyrolytic carbon film attachment.
2Temperature
If the carbon fiber molded body is used as thermal insulation material, then the heat resistant temperature is improved, but particles are generated due to oxidation and mechanical friction
Solution Approach 1:
The invention applies a slurry coating layer as a protective barrier before the carbon fiber molded body is exposed to oxidizing environments or mechanical friction. This preliminary protective action prevents oxidation and particle generation from the carbon fibers while maintaining the high heat resistant temperature capability, as the slurry layer acts as a shield against harmful environmental factors.
3Adaptability or versatility
If the felt structure is used for thermal insulation, then the deformability is improved, but the shape retention property is reduced
Solution Approach 1:
The invention creates a composite structure with distinct functional layers: a deformable carbon fiber molded body base layer and a slurry coating surface layer. The base layer provides deformability for adaptation to different spaces, while the surface layer with its specific composition provides shape retention and structural integrity, thus resolving the contradiction between deformability and shape retention through functional segmentation.
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 effectively prevents particle generation and maintains thermal insulation performance by ensuring a strong bonding force between layers, thereby preventing the covering layer from peeling off and reducing heat conduction.
Implementation Method 1
formed using a chemical vapor deposition method
Implementation Method 2
The carbon-based particles and the carbon fibers in the base layer are bonded to each other with a carbon-based adhesive
Implementation Method 3
prevents particle generation due to oxidation and mechanical friction
Data Source
AI summary
A thermal insulation material having carbon fibers, the thermal insulation material containing; a covering layer containing pyrolytic carbon at a surface of the thermal insulation material; and a base layer containing carbon-based particles between the carbon fibers below the covering layer. A method for producing a thermal insulation material including: forming a base layer by impregnating a surface of a molded body containing carbon fibers with a slurry containing carbon-based particles; and forming a covering layer containing pyrolytic carbon on the base layer by applying a chemical vapor deposition method to the molded body in a CVD furnace.