Selected Mechanical and Physical Properties of Boron Filaments.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
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Results are presented from an investigation to characterize boron filament with respect to selected mechanical and physical properties. The investigation of 12 different filaments included examination by metallographic techniques and the determination of mechanical properties over the temperature range from room temperature to 2500 deg F 1644 deg K in argon, air, and vacuum. The study was primarily concerned with the properties of individual boron filaments produced by the deposition of boron on the surface of a fine tungsten substrate wire from a vapor composed of hydrogen and a boron halide compound. These filaments exhibited an average room-temperature strength of 350 ksi 2.42 GNsq meters and retained approximately two-thirds of this strength at temperatures up to 2000 deg F 1366 deg K. The range of scatter among individual tensile strength values was generally equal to the mean value of strength. An average Youngs modulus value of 60 x 10exp 3 ksi 414 GNsq meters was recorded.
- Inorganic Chemistry