The positive role of mesophase-pitch-based carbon fibers in enhancing thermal response behavior in Carbon/Carbon composites

The high-thermal-conductive Carbon/Carbon (HTC-C/C) composites using mesophase-pitch-based carbon fibers (CFMP) as heat conduction carriers are promising thermal management materials in high-tech fields. The com-posites undergo a complex dynamic temperature variation in practical application and their thermal response behavior and the enhancing effect of CFMP are not clear. The one-dimensional, two-dimensional and three-dimensional HTC-C/C composites were prepared with thermal conductivity of 528 W center dot m(-1)center dot K-1, 429 W center dot m(-1)center dot K-1 and 437 W center dot m(-1)center dot K-1 in the CFMP direction, respectively, and the thermal response behaviors were investigated by infrared thermal imager. The results reveal that the graphitized CFMP with azimuth angle 7.69 degrees, graphitization degree 75.49% and thermal conductivity 700 W center dot m(-1)center dot K-1 can transfer heat efficiently in the composite. The temperature variation and distribution of composites are all determined by the CFMP arrange-ment and have a good corresponding relationship with the size and shape of pore defects. In comparison with one-dimensional composite, the two-dimensional and three-dimensional composites exhibit pronounced stri-ped and grid-like temperature distribution, respectively.

Automated summary

The high-thermal-conductive Carbon/Carbon (HTC-C/C) composites using mesophase-pitch-based carbon fibers (CFMP) as the heat conduction carriers are potential thermal management materials in high-tech fields. The thermal response behavior and the enhancing effect of CFMP are investigated in the complex dynamic temperature variation of the composites. One-dimensional, two-dimensional, and three-dimensional HTC-C/C composites with different thermal conductivities in the CFMP direction are prepared, and their thermal response behaviors are studied using infrared thermal imager. The results show that graphitized CFMP with specific parameters can efficiently transfer heat in the composite, and the temperature distribution and variation are determined by the CFMP arrangement and the size and shape of pore defects in the composites.