A Study of Several Oxidation-resistant Coatings on Mo-0.5Ti Alloy Sheet at 2,500 ̊F

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National Aeronautics and Space Administration, 1964 - Molybdenum - 78 pages
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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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