Gg. Lu et al., ELECTRICAL AND SHIELDING PROPERTIES OF ABS RESIN FILLED WITH NICKEL-COATED CARBON-FIBERS, Composites science and technology, 56(2), 1996, pp. 193-200
Electrical conductivity and shielding effectiveness of nickel-coated c
arbon fibers and their composites have been studied and the results ar
e presented in this paper. A continuous electroplating device was used
to plate nickel over the surface of the carbon fibers. The resistivit
y of Ni-coated carbon fibers decreases with an increase in plating tim
e. The optimum thickness of the coating is 0.2-0.5 mu m. A solvent met
hod and Brabender mixing were used to prepare the composites of Ni-coa
ted carbon fibers in ABS resin, the resistivity of which decreases wit
h an increase in fiber content. At the same fiber content, the conduct
ivity of the composites filled with Ni-coated carbon fibers is much gr
eater than that of ordinary carbon-fiber-filled composites. To reach t
he same resistivity as carbon-fiber-filled composites, the use of Ni-c
oated carbon fibers as filler can greatly decrease the required volume
fraction of fibers. The shielding effectiveness of the composites was
obtained by experiment and by theoretical calculation; at high freque
ncies, the two correspond very well. From experimental measurement, th
e shielding effectiveness of ABS resin filled with 10 vol.% of Ni-coat
ed carbon fibers is about 50 dB.