Carbon Products Prepared from Variant Pitch Materials. VIII. The Preparation of Isotropic Pitch Carbon with a High Density

Abstract

Abstract The present works were undertaken in order to prepare the isotropic Pitch Carbon with a high density and with a desired degree of graphitization. The tablets were prepared by pressing some kinds of variant pitch materials and were then heat-treated below 2600°C in N2 gas. Isotropic Pitch Carbon with a high density and with a low degree of graphitization can be readily prepared by pressing the non-graphitizable variant pitch material under high pressure. On the other hand, for the purpose of preparating isotropic Pitch Carbon with a high density and with a high degree of graphitization, a graphitizable variant pitch material with a low softening point, —in other words, with a good ability of sintering— was pressed into tablets under low pressure. The typical properties of the Pitch Carbon thus obtained (H.T.T. 2600°C) were as follows: Bacon Anisotropic Factor: 1.01; Bulk density: 1.79 g/cc; d002: 3.40 Å; Lc: 210 Å.