Accession Number : AD0289267

Title :   DEVELOPMENT OF PYROLYTIC REFRACTORY MATERIALS FOR SOLID-FUEL ROCKET MOTOR APPLICATIONS

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MASS

Personal Author(s) : FRANCIS,RONALD

Report Date : 10 APR 1962

Pagination or Media Count : 1

Abstract : Preparation of pyrolytic graphite under a variety of conditions and with a variety of hydrocarbon sources is described. Deposition rates increased with source molecular weight although benzene gave an abnormally low value. Virtually independent of source, densities below 1.50 gm/cc at 1700 C rising to approximately theoretical at 2000 C were found. Increase in degree of preferred orientation and crystallite size with deposition temperature attendant with interlattice spacing approaching the values of single crystal graphite is described. Layer ordering increased with heat treatment. Increased carbon flow rates decreased metal concentration in alloying experiments. The effect of deposition temperature appeared to be minor with low vapor pressure. The preparation of well-bonded pyrolytical coatings on rocket motor test nozzle inserts is described. A pyrolytic boron nitride coating suitable for testing was obtained only with low deposition rate at 1600-1800 C on an AGSR substrate. (Author)

Descriptors :   *REFRACTORY COATINGS, *REFRACTORY MATERIALS, *ROCKET NOZZLES, *ROCKET ENGINES, *THERMAL INSULATION, BORON ALLOYS, BORON COMPOUNDS, CARBON, CRYSTAL STRUCTURE, DENSITY, DEPOSITS, GRAPHITE, MANUFACTURING, NITRIDES, OXIDATION, SILICON ALLOYS, TUNGSTEN ALLOYS, VAPOR PLATING, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE