RESEARCH AND DEVELOPMENT ON ADVANCED GRAPHITE MATERIALS. VOLUME 37. STUDIES OF GRAPHITE DEPOSITED BY PYROLYTIC PROCESSES
Rept. for May 1960-May 1962
NATIONAL CARBON CO PARMA OH
Pagination or Media Count:
Work on pyrolytic or vapor-deposited graphite under this program was 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 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.
- Laminates and Composite Materials