High density-high purity graphite prepared by hot isostatic pres

Details High density-high purity graphite prepared by hot isostatic pres High density-high purity graphite prepared by hot isostatic pres

1990-06-18

1994-08-09

Langel, Wayne

Coating processes

Removable protective coating applied

423448, 264102, 264125, 264325, C01B 3104

Patent

active

053365208

ABSTRACT:
Porous graphite in solid form is hot isostatically pressed in a refractory metal container to produce a solid graphite monolith with a bulk density greater than or equal to 2.10 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, chemically vapor deposited, or coated by some other suitable means onto graphite. Hot isostatic pressing at 2200.degree. C. and 30 KSI (206.8 MPa) argon pressure for two hours produces a bulk density of 2.10 g/cc. Complex shapes can be made.

REFERENCES:
patent: 3182102 (1965-05-01), Simnad
patent: 4092384 (1978-05-01), Hrovat
patent: 4094897 (1978-06-01), Nagasawa et al.
patent: 4134451 (1979-01-01), Conant et al.
patent: 4692288 (1987-09-01), Rossmann et al.
patent: 4799957 (1989-01-01), Vogel
patent: 4855103 (1989-08-01), Ekbom
patent: 4983339 (1991-01-01), Boncoeur et al.
Hoenig et al., "Densification studies of Refractory Materials Using H/P and Tantalum Containment" Apr. 27, 1990 Livermore Nat'l Lab.

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