Abstract
Micro-coiled carbon fibers (coils) were prepared by catalytic pyrolysis of acetylene at 650-850°C, and growth conditions, morphology, growth mechanism and some properties were examined. The key points for obtaining coils with high coil yield were strict control of (1) kind of catalyst, (2) kind and flow rate of impurity gas, (3) reaction temperature, and (4) separation between source gas inlet and substrate. The most effective catalysts were Ni, Ti, and W. The coils show an excellent electromagnetic shielding effect. TiC coils were obtained by vapor phase titanizing of the coils.
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