A study of several oxidation-resistant coatings on Mo-0.5Ti alloy sheet at 2,500 ̊F
Donald R. Rummler, Bland A. Stein, Richard A. Pride, United States. National Aeronautics and Space Administration, Langley Research Center
National Aeronautics and Space Administration, 1964 - Technology & Engineering - 78 pages
The results are presented of a study of several silicide-base oxidation-resistant coatings applied to 0.012-inch-thick molybdenum-alloy sheet. The specimens were both continuously and cyclically exposed at 2,500 degrees F in air. The effect of three different types of thermal cycles was investigated. A failure mechanism is proposed to explain the severe reduction observed in the ability of a coating to protect the substrate when thermally cycled. A failure mechanism for the continuously exposed coated specimens is also proposed. The investigation includes the results of X-ray studies and room-temperature mechanical-property tests on the coated specimens.
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0xidation 1.0-hour cycles 10-percent weight loss As-coated appearance as-coated specimens as-coated surface boron box furnace COATED MOLYBDENUM ALLOY coating A(G coating F coating supplier coating surface coating to protect coatings applied coatings tested cracks cristobalite Cross section cyclic tests cyclic-exposure oxidation tests cyclically exposed detected edge conditions Edge Edge Edge edge failures edge preparation examined exposure at 2,500 F in air F specimens failure mechanism Figure gain weight grain structure indicated Langley Research Center Mo-0.5Ti sheet Mo^Si molybdenum-alloy sheet MoSi2 NASA OA number of cycles oxidation-resistant coatings oxygen percent percent percent polarized light probing protect the substrate required to sustain Rummler sheared edges sheared-edge specimens silicide silicide-base silicon carbide specimens tested specimens with coating Stein sustain weight loss test temperature thermally cycled thermocouple tion tumbled edges tumbled-edge specimens typical U.S. Air Force various coatings vertical tube weight change weight gain weight-loss rate X-ray diffraction yield stress Young's modulus zircon boat