Accession Number : AD0609247

Title :   IMPROVED GRAPHITE MATERIALS FOR HIGHTEMPERATURE AEROSPACE USE. VOLUME II. DEVELOPMENT OF GRAPHITE-REFRACTORY COMPOSITES.

Descriptive Note : Rept. for 1 May 63-30 Apr 64.

Corporate Author : UNION CARBIDE CORP LAWRENCEBURG TENN CARBON PRODUCTS DIV

Report Date : OCT 1964

Pagination or Media Count : 143

Abstract : New graphite-base refractory composites were developed through the selective substitution of the components in grade JTA. Studies were conducted on the following composite changes: zirconium, silicon and niobium replacement of boron; and niobium, cerium and lanthanum replacement of silicon. Studies of graphite-oxide reactions have provided information concerning the stability of oxide coatings in contact with carbon bodies. The most oxidation-resistant composite was JT-0981 in which the boron was completely replaced with silicon. This material exhibited excellent performance at 1700, 1800, 1900, and 2000C; however, at lower temperatures, no protective coating was formed and the performance was poor. Plasma tests conducted at 1900C on the front face of JTA samples shows its excellent oxidation resistance. Similar tests on JT-0981 were stopped when the low temperature areas on the samples were losing material faster than the hot face.

Descriptors :   (*COMPOSITE MATERIALS, GRAPHITE), (*GRAPHITE, AEROSPACE CRAFT), (*REFRACTORY MATERIALS, COMPOSITE MATERIALS), OXIDATION, COATINGS, STABILITY, PROTECTIVE COVERINGS, CORROSION INHIBITION, OXIDES, HEAT RESISTANT MATERIALS, REACTION KINETICS, GRAPHICS, ZIRCONIUM, SILICON, NIOBIUM, BORON, CERIUM, LANTHANUM, ROCKET ENGINES

Distribution Statement : APPROVED FOR PUBLIC RELEASE