IMPROVED GRAPHITE MATERIALS FOR HIGH-TEMPERATURE AEROSPACE USE. VOLUME 2. DEVELOPMENT OF GRAPHITE-REFRACTORY COMPOSITES
Rept. for 1 May 1963-30 Apr 1964
UNION CARBIDE CORP LAWRENCEBURG TN CARBON PRODUCTS DIV
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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.
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