Lightweight carbon-bonded carbon fiber composites prepared by pressure filtration technique

Carbon-bonded carbon fiber composites were produced by a simple pressure filtration technique. This method consists of dispersing carbon fibers and phenolic resin to make a slurry and then pressing the water out through a filter cloth, and finally carbonizing the composites at 1000 °C in nitrogen. A homogeneous microstructure without agglomeration and layering was achieved. The compressive strength ranged from 0.2 to 1.1 MPa for different densities. The thermal conductivity for the composites of 0.23 g cm−3 was 0.2–0.43 and 0.11–0.35 W m−1 K−1 for the directions perpendicular and parallel to the pressure, respectively, at 25–1300 °C.