Abstract
CNTs/SiC composites were synthesized by pyrolysis of methane over SiC supported nickel catalysts. The composites show good microwave absorption ability in the frequency range of 2–18GHz. The pyrolysis temperature has profound influences on the microwave absorption characteristic, and 700°C is the most suitable temperature for preparation of the composites. The microwave absorption characteristic is also influenced by the Ni loading. By varying the Ni loading from 5wt.% to 7.5wt.%, the bandwidth of reflection loss below −10dB can be broadened by 1.5GHz under the same conditions. For the composite obtained from 7.5wt.% Ni loading and the pyrolysis temperature of 700°C, a minimum reflection loss of −37.6dB can be obtained at 14.5GHz with a thickness of 1.9mm and the bandwidth of reflection loss below −10dB can reach 5.1GHz (from 12.4 to 17.5GHz) with a thickness of 2mm.
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