Electric Field Grading Material Based on Thermally Reduced Graphene Oxide
DOI :
https://doi.org/10.5324/nordis.v0i24.2282Mots-clés :
nano particles, field grading, graphene oxide, silicone rubberRésumé
Silicone rubber filled with low amounts of thermally
reduced graphene oxide exhibit non-linear conductivity
with exposed to increased electric fields. Such material
can be interesting as electric field grading material in
HVDC cable accessories. In this study graphene oxide
was thermally reduced (rGO) at 120 and 180 °C during
12 hours in a hot air oven. The reduction was confirmed
by TGA and FTIR. 3 wt.% rGO was then dispersed in a
silicone rubber matrix and homogenous dispersion was
demonstrated by the scanning electron microscopy. The
rGO-filled silicone rubber (120 and 180 °C reduced)
exhibited a non-linear resistivity when exposed to an
increasing electric (DC) field. The conductivity
decreased from 10^14 to 10^11 Ohm m when the electric
field increasing from 0.2 to 6 kV/mm. The onset of the
non-linear conduction occurred in the range of 1 – 2
kV/mm. The long-term stability of the conductivity of
the silicone rubber composite was tested. After 47 days
ageing at 120 °C, therGO/silicone rubber composite
exhibited a slight increase in the onset of non-linear
conduction, as well as a minor increase in resistivity.
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