SYMPOSIA PAPER Published: 01 January 1969
STP49831S

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

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.

Author Information

Petrasek, D., W.
NASA Lewis Research Center, Cleveland, Ohio
Signorelli, R., A.
NASA Lewis Research Center, Cleveland, Ohio
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Details
Developed by Committee: D30
Pages: 405–416
DOI: 10.1520/STP49831S
ISBN-EB: 978-0-8031-8904-1
ISBN-13: 978-0-8031-0017-6