Published: Jan 1969
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The potential of tungsten-2 percent thoria, 218 tungsten, and tungsten-1 percent thoria wire reinforced nickel-base superalloy composites for turbine bucket applications was evaluated based on stress-rupture strength, oxidation, and impact resistance. The results indicate that refractory metal alloy fiber-superalloy composites have potential for turbine bucket use based on the properties measured. Composites were produced having stress-rupture properties superior to conventional cast superalloys at use temperatures of 2000 and 2200 F. The 100 and 1000-h stress-rupture strength of the composite at 2000 F was 49,000 and 37,000 psi, respectively. A few thousands of an inch of matrix or cladding material was found to be sufficient to protect the fibers from oxidation at 2000 F for times up to 300 h. At 300 F and above the impact resistance of the composite compares favorably with that of superalloys.
fiber reinforcement, fiber composites, superalloy, mechanical properties, turbojet engine, turbine bucket alloy, oxidation, high-temperature alloy, refractory fiber, tungsten wire, evaluation, tests
Petrasek, D. W.
Materials engineer, NASA Lewis Research Center, Cleveland, Ohio
Signorelli, R. A.
Head, NASA Lewis Research Center, Cleveland, Ohio
Paper ID: STP49831S