Graphitization of Carbon-Carbon Composites: High-Temperature Processing"&" Technology for C/C Materials
Carbon-carbon (C/C) composites are composite materials with carbon fiber as the reinforcement and carbon matrix as the matrix. They possess excellent properties such as high temperature resistance, low density, and h"&"igh specific strength, and have important applications in aerospace, nuclear energy, and other fields.
C/C Composite Material Preparation Process
The preparation of C/C composite materials typically includes:"&"
- Preform Weaving: Weaving carbon fibers into the desired shape
- Densification: CVI or pitch impregnation and carbonization to fill pores
- Graphitization: High-temperature t"&"reatment to graphitize the carbon matrix
Characteristics of Graphitization Process
The graphitization of C/C composite materials has the following characteristics:
- High Temperature: Typically 2500-3000℃, to fully graphitize the carbon matrix
- Structural Evolution: Turbostratic carbon C/C composites are used in: **Carbon (carbon)** → Ordered graphite layer structure **Performance Improvement:** Grap"&"hitization significantly improves thermal conductivity and abrasion resistance. **Shrinkage Control:** The material shrinks during graphitization; uniform shrinkage needs to be controlled. **Main Application Areas:** **Graphitized C/C composites are us"&"ed in:** **Aircraft Brake Discs:** Boeing, Airbus, and other civil aircraft **Rocket Nozzles:** Solid rocket motor throat liners **Nuclear Reactor Components:** High-temperature gas-cooled reactor control rods **Photovoltaic Thermal Fields:** Single-c"&"rystal silicon growth furnace components ****Popularization Thermal Fields:** Components for single-crystal silicon growth furnaces Key Points: The key to graphitization of C/C composite materials lies in the control of temperature field uniformity and h"&"eating rate. Due to the large volume and complex structure of the material, uneven temperature field can lead to internal stress, cracking, and deformation.")