Optimisation of anisotropic phase content in the mesophase transformation of tar pitch for the production of carbon fibres
The production of carbon fibres from coal tar pitch and in particular from petroleum pitch has been developed recently in Japan and the USA. The process consists of the extrusion and subsequent carbonisation of a pseudocrystalline intermediate liquid phase of the pitch called "mesophase", which can be detected by optical microscopy owing to its anisotropic properties. The mesophase quantity and kind are considered fundamental factors for producing fibres. The critical steps for the mesophase formation are purification and thermal treatment of pitch. The object of this research was to study the influence of purity characteristics of coal tar pitch (QI, TI, ash) on mesophase formation and its spinning. Four pitches and two coal tars were selected for the experimental work, which was divided into the following parts: (1) characterisation of raw materials; (2) pretreatments; (3) thermal treatments; (4) characterisation of material after thermal treatments; (5) extrusion.
Bibliographic Reference: EUR 14018 IT (1992) 15 pp., MF, ECU 4, blow-up copy ECU 6
Record Number: 199210590 / Last updated on: 1994-12-02
Original language: it
Available languages: it