Accession Number : ADA310397

Title :   Selected Mechanical and Physical Properties of Boron Filaments.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Herring, Harvey W.

PDF Url : ADA310397

Report Date : JAN 1966

Pagination or Media Count : 42

Abstract : 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 GN/sq 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 Young's modulus value of 60 x 10(exp 3) ksi (414 GN/sq meters) was recorded.

Descriptors :   *MECHANICAL PROPERTIES, *PHYSICAL PROPERTIES, *FILAMENTS, *BORON, TEMPERATURE, SCATTERING, TENSILE STRENGTH, STRUCTURAL PROPERTIES, VAPORS, HIGH TEMPERATURE, WIRE, STIFFNESS, MODULUS OF ELASTICITY, VACUUM, COMPOSITE STRUCTURES, SUBSTRATES, ROOM TEMPERATURE, HYDROGEN, DEPOSITION, HALIDES, RANGE(EXTREMES), ARGON, TUNGSTEN.

Subject Categories : Inorganic Chemistry
      Textiles
      Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE