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Title: High density-high purity graphite prepared by hot isostatic pressing in refractory metal containers

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.
Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
869437
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5336520
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
density-high; purity; graphite; prepared; hot; isostatic; pressing; refractory; metal; containers; porous; solid; form; isostatically; pressed; container; produce; monolith; bulk; density; equal; 10; cc; formed; tantalum; niobium; tungsten; molybdenum; alloys; canister; alternatively; plasma; sprayed; chemically; vapor; deposited; coated; suitable; means; 2200; degree; 30; ksi; 206; mpa; argon; pressure; hours; produces; complex; shapes; suitable means; hot isostatically; solid form; bulk density; plasma spray; vapor deposited; refractory metal; hot isostatic; isostatic pressing; isostatically pressed; plasma sprayed; metal container; solid graphite; argon pressure; porous graphite; metal containers; alternatively plasma; complex shapes; chemically vapor; hours produces; complex shape; /427/264/423/