Heat Resistant Structure Using Layered C/C Composite Core
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Solution Overview
Problem
Heat-resistant structures using carbon fiber-reinforced carbon composite materials (C/C composites) within metallic pipes face challenges such as increased production complexity and cost with thicker composites, along with environmental concerns from discarded offcuts, and susceptibility to thermal deformation.
Innovation Solution
A heat-resistant structure comprising a core of layered C/C composite members within a metallic pipe shell, where the C/C composite members are oriented to align with the load direction and filled to a high filling rate, reducing thickness and production costs while minimizing thermal deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a thick C/C composite is used to reduce thermal deformation, then thermal stability is improved, but manufacturing difficulty increases and productivity decreases
Solution Approach 1:
The C/C composite is divided into multiple thin layers instead of using a single thick composite. Each layer has a thickness of 0.5-5mm, and multiple layers are stacked to achieve the required total thickness. This segmentation enables easier manufacturing of each individual layer while maintaining the overall thermal stability through the layered structure.
Solution Approach 2:
Multiple C/C composite layers are nested within a metallic pipe structure. The layered C/C composites are placed inside the metallic pipe, creating a composite structure where the metallic pipe provides structural support and protection while the layered C/C composites provide thermal stability. This nested configuration simplifies manufacturing compared to producing a single thick C/C composite.
2Stability of the object's composition
If a thick C/C composite is used to reduce thermal deformation, then thermal stability is improved, but production cost increases
Solution Approach 1:
Dividing the C/C composite into thin layers reduces manufacturing difficulty and cost. Each thin layer can be produced more easily and efficiently than a thick composite, allowing for better cost control while achieving the required thermal stability through the cumulative effect of multiple layers.
Solution Approach 2:
The invention enables effective utilization of C/C composite offcuts. Small-thickness offcuts that would normally be discarded can be reused as individual layers or combined to form the required layered structure, reducing material waste and lowering production costs.
3Stability of the object's composition
If a thick C/C composite is used to reduce thermal deformation, then thermal stability is improved, but material waste increases
Solution Approach 1:
This principle is directly applied to recover and reuse C/C composite offcuts. Instead of discarding small-thickness offcuts during manufacturing, they are utilized as the thin layers in the layered structure. This approach minimizes material waste while achieving the required thermal stability through the accumulated thickness of multiple reused layers.
Solution Approach 2:
The invention changes the parameter of layer thickness from a single large value to multiple small values. By using many thin layers instead of one thick composite, the structure can be assembled from smaller, more manageable pieces including offcuts, thereby reducing material loss.
4Weight of moving object
If a metallic bar is used instead of C/C composite, then weight is reduced and ease of manufacture is improved, but susceptibility to thermal deformation increases
Solution Approach 1:
The invention creates a composite structure combining metallic pipe and C/C composite layers. The metallic pipe provides structural support and can be lighter than solid C/C composite, while the C/C composite layers provide thermal stability. This composite approach allows the structure to benefit from both materials: the metal's weight advantage and the C/C composite's thermal resistance.
Solution Approach 2:
The C/C composite layers are nested within the metallic pipe, creating a hierarchical structure where each material performs its optimal function. The metallic pipe forms the outer structure providing mechanical strength and weight efficiency, while the nested C/C layers provide thermal stability, achieving a balance between weight and thermal resistance.
Data Source
AI summary
A heat resistant structure includes: a core formed of a plurality of C/C composite members; and a shell material covering at least a portion of a surface of the core and made of metal.