Evaluation of naphthalene-derived mesophase pitches as a binder for carbon-carbon composites

✍ Scribed by Ryuji Fujiura; Takashi Kojima; Koichi Kanno; Isao Mochida; Yozo Korai

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 611 KB
• Volume: 31
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(93)90161-3

✦ Synopsis

Binding properties of the mesophase pitches produced catalytically from naphthalene with HF/BFJ were examined in terms of their carbon value, fluidity, thermal stability, and oxidative stabilization reactivity. The present pitches with 100% anisotrophy and low softening points of 207-275°C provided very high coke yields of 80-88 wt% under atmospheric pressure and 90-95 wt% under 30 atm. Pitches with softening points of 207 and 224°C exhibited strikingly low viscosity below 1 Pa*s at 350°C. It is noted that viscosity-temperature profiles of a series of the present pitches cover the complete area of the processing window for the manufacture of carbon-carbon composites, whose processes typically include impregnation of mesophase pitch into a two-dimensional carbon fiber preform, oxidative stabilization, and successive carbonizations. The pitches were thermally stable under nitrogen at 3Oo"C, keep ing the melt viscosity constant for longer than 100 h to assure easy handling. At the same time, they were very reactive for the oxidation in air at 200°C for rapid stabilization.