Abstract
Carbon bonded carbon fiber (CBCF) composites with different fiber volume fractions (FVFs) are prepared. This paper mainly investigates the effect of FVFs and the ultra-high temperature on the mechanical and thermal properties of CBCF composites. Experimental results show that the microstructure of CBCF composites is anisotropic, random distribution in xy direction and layering in z direction. With higher FVFs, the modulus and fracture strength are higher. The fracture strength in xy direction is greatly higher than that in z direction, because more fibers bear the load. Elastoplastic behavior of stress-strain curves is observed in z direction, which is attributed to the compression of porosity and gap. Especially, at ultra-high temperature, the plastic hardening effect is remarkable. In addition, the thermal conductivities of CBCF composites with different FVFs are characterized, which increase exponentially with temperature.
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