Characterisation of coal tar and petroleum pitches and13; preparation of carbon-carbon Composites

Pai, BC and Sridhar, MK and Kanakalatha, P (1983) Characterisation of coal tar and petroleum pitches and13; preparation of carbon-carbon Composites. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

Mesophase structures in both coal tar and petroleum pitches were developed when the pitches were heated under vacuum at 390xB0;C to remove about 20 wt% low molecular hydrocarbons13; and then subsequently heated to 420xB0;C and above. The removal of volatile matters at 390xB0;C and 420xB0;C also increased the melting point of the pitches and also increased the pyridene insoubles. Additions of 0.05 mole fractions of FeC13 to the pitches aided polymerisation and mesophase formation. In FeC13 treated pitches at lower fractions of removal of hydrocarbons itself the melting points increased. 13; Intentionally added graphite particles did not aid the13; mesophase formation. 13; Carbon-carbon composites were prepared by impregnating the ablative grade carbon fabric by treated pitch (heat treated at 390xB0;C to remove about 20 wt% volatile matter), mesophase pitch and unreated pitch pyrolysed under pressure in an autoclave. In all cases the density of the composite increased with the increase in the number of impregnation13; and pyrolysis cycle. The density of the composites were in13; the increasing order from the treated pitch to mesophase13; pitch pitch to the pressure pyrolysed/of the composite. Relatively high density of the obtained composite indicates the soundness of the consolidation process. The lower tensile and compressive, properties of the composites were due to the ablative grade carbon fabric reinforced in the composites.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Mesophase structures;Petroleum pitches;Molecular hydrocarbons;13; Volatile matters;Graphite particles;Pyrolysis cycle
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Users 90 not found.
Date Deposited: 30 Oct 2006
Last Modified: 24 May 2010 04:22
URI: http://nal-ir.nal.res.in/id/eprint/3191

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