An Evaluation of Coated Molybdenum and Columbium Alloys in High-Temperature Supersonic Airstreams
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
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An experimental study was made to investigate the oxidation behavior of four commercially coated refractory metal systems in supersonic airstreams Durak B and Vought IX coated TZM and Cr-Ti-Si-and Cr-MoSi2 coated Cb-752. Cyclic coating life and temperature data were obtained on 0.375-inch-diameter 0.953 cm blunt-nose models at surface temperatures from 2600 deg to 3000 deg F 1700 deg to 1920 deg K and at air stagnation pressures behind the shock wave of 0.03, 0.10, and 5.5 atmospheres. The oxidation behavior of uncoated molybdenum- and columbium-alloy models of the same size and shape was also studied in the same test environments.
- Properties of Metals and Alloys