| Abstrakt: |
Co-carbonization of non-coking coals and pitch materials has been followed by optical microscopy and thermogravimetry. The results obtained at a heating rate ⪢ 5 K min−1, clearly indicate a strong correlation between the thermogravimetric behaviour of the blend and the development of anisotropic texture in the resultant coke. For non-interacting systems, i.e. no enhancement of the anisotropic texture, the instantaneous rates of weight losses during carbonization of each component in the blend are almost additive. In contrast, for interacting systems, the thermogravimetric behaviour of the blend differs widely from the one obtained by adding the rates of weight losses of each component taken separately. The improvement of anisotropy of a coke by adding pitch to the initial coal results from a chemical stabilization of the system by pitch in the temperature range where, in the absence of pitch cross-links are formed which hinder the subsequent formation of large organized aromatic units. |
