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    Tungsten Alloy Fiber Reinforced Nickel Base Alloy Composites for High-Temperature Turbojet Engine Applications

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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

    Author Information:

    Petrasek, D. W.
    Materials engineer, NASA Lewis Research Center, Cleveland, Ohio

    Signorelli, R. A.
    Head, NASA Lewis Research Center, Cleveland, Ohio

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP49831S