High density crystalline boron prepared by hot isostatic pressin

Chemistry of inorganic compounds – Boron or compound thereof – Elemental boron

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264 56, 264 65, 419 49, 423290, 501 96, C04B 3564, C04B 3556, C01B 2106

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active

052406911

ABSTRACT:
Boron powder is hot isostatically pressed in a refractory metal container to produce a solid boron monolith with a bulk density at least 2.22 g/cc and up to or greater than 2.34 g/cc. The refractory metal container is formed of tantalum, niobium, tungsten, molybdenum or alloys thereof in the form of a canister or alternatively plasma sprayed or chemical vapor deposited onto a powder compact. Hot isostatic pressing at 1800.degree. C. and 30 KSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.34 g/cc. Complex shapes can be made.

REFERENCES:
patent: 4381931 (1983-05-01), Hunold et al.
patent: 4634640 (1987-01-01), Hunold et al.
patent: 4952353 (1990-08-01), Neil
patent: 4956315 (1990-09-01), Mehrota et al.
patent: 4983339 (1991-01-01), Boncoeur

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