The electrical and thermal conductivity properties of ceramics fabricated from carbon powder and clay have been studied. This study was designed by varying the particle size of carbon powders of mesh 150; 200; 250; 300; 350, with a carbon-organoclay ratio of 30: 70% by weight, 200 bar compacting, and sintering of 950; 1000; 1050 °C. Electrical conductivity, thermal conductivity, specific wear rate, density/porosity, and ceramic morphology have been studied. The thermal conductivity follows the tendency of electrical conductivity, because of the effect of carbon particle size. Increased sintering temperatures tend to decrease wear resistance. The smaller the particle size of carbon powder, it tends to increase the wear rate and the density of carbon-ceramic experiences relatively small changes. Porosity tends to follow density, even though the size of carbon particles gets smaller. The occurrence of porous and cracking is more due to the irregular shape of carbon and matrix particles.

Keywords: electrical conductivity, thermal conductivity, carbon-ceramic, carbon particle size, organoclay