Preparation C-Carbon Composite Using Natural Graphite and Novolac Resin
Carbon composites are prepared by using natural graphite (NG) as raw material which has to be good at electrical conductivity and excellent corrosion resistance at low density of about 2 g/cm3. NG comprises flake-like particles which provide better face to face contact rather than point to point contact in spherical ones. Reported Expanded Graphite (EG)/Novolac Phenolic Resin (NPR) needs optimisation for proper volumetric mixing of EG with Resin. Graphite is made up of well-known hexagonal phase which is more stable phase and the rhombohedral phase is thermodynamically unstable formed by ball milling. Lattice defects induced in graphite break down the hexagonal symmetry of the graphite lattice. It’s get down to nano-crystalline regime of fine grains which increase the free energy and form amorphous structure after forming nano structures.Samples were prepared form graphite-carbon composites by uniaxial hot compression after ball milling of NG with NPR followed by curing. The temperature was characterised for physical and mechanical properties. The intrinsically insulating polymer resins gets filled with filler material (NG) so as to get better percolation and better conductivity.