Catalytic graphitization of carbon fibers by boron doping
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Carbon fibers (CFs) have attracted considerable attention as a reinforcing filler with promising composite applications including aerospace and automotive industries owing to outstanding flexibility, light-weight, and high mechanical property. To increase tensile modulus of the CFs, graphitization is generally known procedure. Although tensile modulus of the CFs can be improved by the graphitization process, tensile strength is typically reduced due to the nature of highly development of graphitic structure. In this study, boron-doped CFs (B-CFs) were prepared from polyacrylonitrile precursors by heat treatment maximum up to 2700 ℃. Particularly, the tensile strength of B-CF-2400 was shown to be higher (~3.0 GPa) than pristine CF-2400 (~2.1 GPa). Therefore, it was suggested that boron-doping acted as catalytic effect during graphitization and played an important role in increasing mechanical properties of the B-CFs depending on heat treatment temperatures.