Accession Number : AD0257917

Title :   HIGH-TEMPERATURE- AND OXIDATION-RESISTANT MATERIALS

Corporate Author : LIBRARY OF CONGRESS WASHINGTON D C AEROSPACE TECHNOLOGY DIV

Report Date : 19 MAY 1961

Pagination or Media Count : 1

Abstract : A study of the protection of carbon and graphite materials from oxidation in air at elevated temperatures is reported. The method of protection consisted in coating the surfaces of the materials to be protected with mineral enamels. The enamels tested were composed of a high-refractory powdered material cemented together and bonded to the carbon surface by a glasslike binder melted directly on the specimen. Molybdenum silicide or silicon carbide, either alone or in combination, were tested with four different binders. The best results were obtained with molybdenum silicide and binder 238, which consists of 80% SiO2, 2.5% Al2O3, and 17.5% B2O3. The technique of application consisted of covering the specimens with a three-layer coating of the slip, drying, and firing at 1200-1600 C in an argon atmosphere. The high-quality glass-silicide coatings can prevent the oxidative destruction of carbon and graphite materials for at least 100 hours at temperatures up to 1200 C. (Author)

Descriptors :   *CARBON, *CERAMIC COATINGS, *GRAPHITE, *REFRACTORY COATINGS, *SILICON COATINGS, AERODYNAMIC HEATING, ALUMINUM COMPOUNDS, ANTIOXIDANTS, BINDERS, BORIDES, CARBIDES, COATINGS, DEGRADATION, GLASS, GUIDED MISSILES, HIGH TEMPERATURE, MOLYBDENUM COMPOUNDS, NUCLEAR REACTIONS, OXIDATION, OXIDES, REENTRY VEHICLES, SILICIDES, SILICON COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE