High density hexagonal boron nitride prepared by hot isostatic p

Details High density hexagonal boron nitride prepared by hot isostatic p High density hexagonal boron nitride prepared by hot isostatic p

1990-06-18

1992-05-26

Chaudhuri, Olik

Chemistry of inorganic compounds

Boron or compound thereof

Elemental boron

501 96, 264 56, 264 65, C04B 3564

Patent

active

051165899

ABSTRACT:
Boron nitride powder with less than or equal to the oxygen content of starting powder (down to 0.5% or less) is hot isostatically pressed in a refractory metal container to produce hexagonal boron nitride with a bulk density greater than 2.0 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 2.21 g/cc. Complex shapes can be made.

REFERENCES:
patent: 4381931 (1983-05-01), Hunold et al.
patent: 4634646 (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 et al.

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