Effect of HP Process Temperature on the Density and Porosity of Carbon-Carbon Composites Made of Coal Waste Powder

This paper will reveal the results of experimental studies on the influence of temperature variations of Hot press (HP) process on density and porosity of carbon-carbon composites made of coal waste powder with coal tar pitch matrix. The study was begun to mix the coal waste powder having a size of > 80 mesh with coal tar pitch with a ratio of 70%:30% weight in the hot of 80 to 100 °C, the mixture was compacted in the HP pressure of 641 bar and the temperature varied from 300, 330, 350 °C. The specimens were cured pyrolysis in a temperature of 500 °C, for 15 min. Specimens were examined the physical properties of density and porosity and tested with SEM to measure the size of voids that occurred. Hot press (HP) process produced density 1.43, 1.434, 1.448 gram/cm 3 and porosity of 15.384%, 6.278%, 4.868%, respectively. Increased temperature of HP process was proven to be able to increase the density while lowering porosity values, and thus carbon-carbon composites more dense.