Decisive properties of graphite-filled cement composites for device application |
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Authors: | S Bhattacharya VK Sachdev R Chatterjee RP Tandon |
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Institution: | (1) Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India;(2) Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi, India |
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Abstract: | Graphite-filled cement composites have been explored in order to design a new conductor–insulator composite system that can
show higher shielding effectiveness to electromagnetic (EM) radiation besides higher mechanical strength. The fascinating
feature of this work is the processing of cement/graphite composites through which both reflection and absorption of EM radiation
are anticipated to increase with increase of graphite filler. The dc conductivity was initially found to increase rapidly
with the increase in filler concentration; it then approached saturation after incorporation of 10 wt. % graphite. The permittivity
increased progressively with increase in filler loading. Decrease in permittivity with increasing frequency has been registered
for all compositions of the composites. The dielectric behavior can be endorsed to Maxwell–Wagner–Sillars theory, both in
terms of filler concentration and frequency dependence. At a low frequency of 10 Hz, a very high dielectric constant of the
order of 108 has been noticed in 5 wt. % graphite composite, which is expected to increase further with increase in graphite content.
The D-Shore hardness results have revealed very little alteration in hardness with increasing graphite content.
PACS 72.80.Tm; 77.22.Ch; 77.22.Gm; 81.20.Ev; 81.40.Tv |
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