EXPLORATORY INVESTIGATION OF SEVERAL COATED AND UNCOATEDnMETAL, REFRACTORY, AND GRAPHITE MODELS IN An3,800° F STAGNATION TEMPERATURE AIR JET

摘要

An exploratory investigation was conducted on several coated and uncoated metal, graphite, and refractory materials models to determine their reaction in a high-velocity hot airstream having stagnation temperature of approximately 3,800° F for periods of time up to 60 seconds. Tests on the molybdenum models indicate that unprotected molybdenum oxidizes rapidly, whereas the metal protected by various coatings successfully resisted rapid oxidation for short periods of time. Some other coatings on molybdenum were not successful. Tests on various grades of graphite produced rapid oxidation when the material was heated to a high temperature. Siliconized graphite and silicon carbide bonded graphite exhibited better oxidation resistance than plain graphite. Refractory models of silicon carbide, zirconium boride, and Siliconized boron showed little change during the tests. A description of the models and the results of the tests performed on them are presented in the present paper.