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Research And Development On Advanced Graphite Materials. Volume XXXVII - Studies Of Graphite Deposited By Pyrolytic Process

Report Number: WADD TR 61-72 Volume 37
Author: Higgs, P. H.
Author: Bobka, R. J.
Author: Seldin, E. J.
Author: Zeitsch, K. J.
Author: Finicle, R. L.
Corporate Author: Advanced Materials Laboratory, National Carbon Company
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-05
Pages: 116
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0601833

Work on pyrolytic or vapor-deposited graphite under this program has been limited to mechanism studies and property measurements. Methods of depositing high quality pyrolytic graphite are described with evidence as to the cause of conical growths and delaminations within the structure of the material. Results are presented on the use of hydrogen, helium and argon as diluents, and on the use of chlorine as an additive in the pyrolytic process. The mean deposition rate is shown to be a function of hydrocarbon concentration, diluent type, gas velocity, temperature and pressure. Theoretical studies of the equilibrium composition of methane as affected by changes in temperature and pressure are presented.

Feasibility studies on the production of graphite of carbon vapor deposition were conducted which indicate that nonlamellar graphite with a predetermined degree of anisotropy can be produced by this method.

Room temperature pull strength of graphite yarn has been increased as much as 360 per cent by reinforcement of the yarn with thin coatings of pyrolytic carbon; both single and multiple strand yarns have been coated.

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