The Effect of Process on the Formation of Graphitic Foam

摘要

The mesophase pitch derived from coal tar pitch in high pressure and temperature chamber is soaked for 2～4 hours to produce pitch foam. The pitch foam can be carbonized and graphitized without stabilization. SEM, WAXD are used to study the influence of the foaming process on the morphology and crystal structure of graphitic foam. The results show that the mesophase pitch with soften point of 300～350℃ and mesophase content of > 80% can produce homogenous and perfect pore structure. The porosity and opening of resulted foam are 55～75% and 75～85% respectively. The porosity and opening decrease with the increase of pressure and increase slightly with the increase of soaking time. The graphitization degree of foam reaches to 84.9% and the ligament of graphitic foam exhibits high alignment.