Abstract
Recently, the uses as fillers for thermosetting plastics wastes have been proposed. However, phenolic resins gave glassy carbon in about 50% yield at a higher temperature under an inert gas. In this study, molding of carbon precursors prepared in thermal decomposition of phenolic resin wastes and properties of the sintered carbon products were discussed. Carbon precursors were prepared at 600°C under the nitrogen gas, then were crushed and were pulverized by means of a ball mill. Test pieces of the carbon precursors were molded with phenolic resins as a binder by press molding, and were sintered at several temperatures (800-2000°C) under the nitrogen atmosphere. The bending strength of the sintered test pieces increased and the electrical resistivity of those decreased, with an increase in the amount of the binder. For the sintered test piece (sintering temp. : 1500°C ; addition of the binder : 20wt%), the bending strength was about 20Mpa, and the electrical resistivity was about 0.01 Ω cm. It is clear that the sintered products are available as some porous solid materials of carbon.
