Abstract: Two carbon foams with different bulk density, marked as CF-1and CF-2 were prepared from AR mesophase pitch by self-foaming method at 450℃ under different foaming pressures, 0.1MPa and 3MPa, respectively. Then CF-1 was reinforced by chemical vapor deposition (CVD) PyC for 10h and 70h, getting two carbon foams marked as CF-1-PC1 and CF-1-PC2. The pore structures of four carbon foams were characterized by scanning electron microscope (SEM) and optical microscope (OM), and compressive strength and thermal conductivity were measured in further. The influences of CVD PyC process on carbon foams were investigated. The results show that CVD PyC can widen the ligament of carbon foams and close cracks in pore walls. No obvious interface exists between pitch carbon and PyC. The corresponding bulk density, compressive strength and thermal conductivity of CF-1-PC1 and CF-1-PC2 are 0.196g·cm^-3, 1.89MPa, 0.314W·m^-1·K^-1 and 0.461g·cm^-3, 11.93MPa, 1.581W·m^-1·K^-1, respectively.

Key words: carbon foams, CVD PyC, mesophase pitch, properties