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Ferric chloride graphite intercalation compounds prepared from graphite fluorideThe reaction between graphite fluoride and ferric chloride was observed in the temperature range of 300 to 400 C. The graphite fluorides used for this reaction have an sp3 electronic structure and are electrical insulators. They can be made by fluorinating either carbon fibers or powder having various degrees of graphitization. Reaction is fast and spontaneous and can occur in the presence of air. The ferric chloride does not have to be predried. The products have an sp2 electronic structure and are electrical conductors. They contain first stage FeCl3 intercalated graphite. Some of the products contain FeCl2*2H2O, others contain FeF3 in concentrations that depend on the intercalation condition. The graphite intercalated compounds (GIC) deintercalated slowly in air at room temperature, but deintercalated quickly and completely at 370 C. Deintercalation is accompanied by the disappearing of iron halides and the formation of rust (hematite) distributed unevenly on the fiber surface. When heated to 400 C in pure N2 (99.99 vol %), this new GIC deintercalates without losing its molecular structure. However, when the compounds are heated to 800 C in quartz tube, they lost most of its halogen atoms and formed iron oxides (other than hematite), distributed evenly in or on the fiber. This iron-oxide-covered fiber may be useful in making carbon-fiber/ceramic-matrix composites with strong bonding at the fiber-ceramic interface.
Document ID
19950006370
Document Type
Conference Paper
Authors
Hung, Ching-Cheh (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1994
Subject Category
CHEMISTRY AND MATERIALS (GENERAL)
Report/Patent Number
E-8299-1
NASA-TM-106447
NAS 1.15:106447
Meeting Information
Biennial Conference on Carbon(Buffalo, NY)
Funding Number(s)
PROJECT: RTOP 506-41-41
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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