Effect of microstructure evaluation during the PIP process on macroscopic properties of C/C composites

Carbon/carbon (C/C) composites have become one of the key new materials in the 21st century due to their excellent properties, including excellent temperature resistance, high electrical conductivity and high mechanical strength. This work analyzed the effects of microstructure evaluation of C/C composite materials at different stages of the precursor impregnation and pyrolysis (PIP) process on the compression and electromagnetic interference (EMI) shielding properties of C/C composites. It was found that the pores in the diameter range of 4–30 μm were the main components of the internal pores of the material during the PIP process. The compressive strength of the C/C composites increased with increasing densification period, and the intrabundle pores had a significant effect on the compressive properties. The electrical conductivity and EMI shielding efficiency of the C/C composites increased with increasing degree of densification, and the main reason for shielding electromagnetic waves was the reflection of the incident power.