THE BORON-CARBON SYSTEM. Quarterly Report No. 3, November 1, 1960-January 31, 1961 | Zendy

Rodney P. Elliott | Zendy

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THE BORON-CARBON SYSTEM. Quarterly Report No. 3, November 1, 1960-January 31, 1961

Author(s) -

Rodney P. Elliott

Publication year - 1961

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/4086142

Subject(s) - eutectic system , boron , boron carbide , solubility , graphite , carbon fibers , melting point , materials science , carbide , diffraction , allotropy , phase (matter) , phase diagram , analytical chemistry (journal) , thermodynamics , metallurgy , chemistry , physics , microstructure , organic chemistry , composite material , composite number , optics

A definitive investigation of the boron-carbon equilibrium system is being made by x-ray diffraction, metallographic, and thermal analytical techniques. On the basis of metallogaphic and x-ray-diffraction studies it is concluded that boron carbide has a range of solubility from approximately 10 to 20 at.% carbon at 1500 to 2000 deg C. The melting point of the carbide-graphite eutectic was established as 2325 to 2350 deg C. No reversible allotropy of the beta -rhombohedral structure was observed. The solubility of carbon in boron is very small. The melting point of dilute carbon alloys is found to be essentially the same as that of pure boron (2040 to 2050 deg C). No metallogaphic evidence of a three-phase reaction of dilute alloys is observed. (auth

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