X-ray Study of Electrographitized Carbon Products IV.

Abstract

Lattice constants and size of graphite crystallites in electrographitized carbon products were reportedin the previous papers (This Journal, 7 (3), 79, (1959); 8 (1), 2 (1960)). However, when a carbonproduct is composed of carbons of different origins, the X-ray diffraction profile of the product shouldalso be composed of diffraction profiles of component carbons. Therefore, values of crystal size calculated from the composite diffraction profile must be different from true values.Experimentally several carbon brushes were found to have composite asymmetric profiles of 004diffraction. It can be seen in the figures that profiles of brushes of carbon black base, such as Superior-E 47, C-1 and C-1*, can be separated into profiles of carbons of carbon black origin and coke origin.Angles of diffraction of brushes of carbon black base seem to give an estimation of carbon black variety, even when the profiles are symmetrical. Profiles of some brushes of coke base are asymmetric, havingsmaller inclination at the low angle side than at the high angle side, suggesting admixture of smallquantity of carbon black or other less graphitizable carbons. Diffraction angles of almost all brushes ofcoke base were smaller than those of electrodes and anodes. Half intensity breadths of 004 diffractionsof these brushes were larger than those of electrodes and anodes. More detailed and quantitative investigation on diffraction profiles of mixtures of different varieties of carbons will be published in theJournal of the Chemical Society, Japan, Industrial Chemistry Edition.