Accession Number : AD0487122

Title :   INTERACTION OF BORON WITH METAL SUBSTRATES AT ELEVATED TEMPERATURES.

Descriptive Note : Final rept. Feb 64-Feb 65,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Hough, Ralph L. ; Adamiak, Carol A. ; Golf, Linwood C.

Report Date : MAY 1966

Pagination or Media Count : 28

Abstract : Boron filaments made by chemical vapor-deposition of the element upon tungsten wires have a modulus of elasticity-to-density ratio several times that for glass filaments. These fibers have been evaluated as a reinforcement in plastic resin matrices and in certain cases the resulting composites exhibit nearly 100 percent of theoretical strength and modulus. The interaction of chemical vapor-deposited boron with a variety of metals at elevated temperatures is examined. Boride formation invariably occurs but an interface of pyrolytic boron nitride effectively precludes diffusion. Because the chemical vapor-deposited amorphous boron is unstable, caution must attend any consideration of this material as a reinforcing medium where extremes of thermal, chemical or mechanical shock occur. (Author)

Descriptors :   (*METALS, PROTECTIVE TREATMENTS), (*BORON, COATINGS), VAPOR PLATING, SUBSTRATES, TUNGSTEN, WIRE, REINFORCING MATERIALS, PRODUCTION, BORIDES, BORON ALLOYS, NITRIDES, REDUCTION, DIFFUSION, STABILITY, THERMAL SHOCK, SHOCK(MECHANICS), MOLYBDENUM, HIGH TEMPERATURE, DEPOSITION, MOLYBDENUM, TITANIUM, ZIRCONIUM, PYROLYTIC GRAPHITE.

Subject Categories : Coatings, Colorants and Finishes
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE