BORON FIBER METAL MATRIX COMPOSITES BY PLASMA SPRAYING.
Final technical rept. 15 Aug 65-15 May 66,
UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT
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Aluminum reinforced by up to 60 volume per cent boron fiber has been fabricated in the form of flat panels by a plasma spray technique. This material exhibited strengths in excess of 130,000 psi at room temperature and 100,000 psi at 500 C in the direction of fiber orientation and less than 10,000 psi in the transverse direction. A modulus of 34 x 10 to the 6th power psi was measured for aluminum containing 50 vo boron fiber. 2024 Al alloy containing 41 vo boron fiber was found to exhibit an apparent endurance limit at 10 to the 7th power cycles of 70,000 psi. Boron-aluminum has been shown to have excellent creep resistance and exhibit a 100 hr rupture life above 30,000 psi at 400 C and above 50,000 psi at 300 C. It was found that boron-titanium composites could not be fabricated without degradation of the fiber. Nickel plating the fiber eliminated this situation however, reaction with the nickel was found to be deleterious. Author
- Laminates and Composite Materials