High density crystalline boron prepared by hot isostatic pressing in refractory metal containers

Patent · Tue Aug 31 04:00:00 EDT 1993

OSTI ID:6266113

Hoenig, C L

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 1,800 C and 30 PSI (206.8 MPa) argon pressure for four hours produces a bulk density of 2.34 g/cc. Complex shapes can be made.

• DOE Contract Number: W-7405-ENG-48
• Assignee: Univ. of California, Oakland, CA (United States)
• Patent Number(s): A; US 5240691
• Application Number: PPN: US 7-539392
• OSTI ID: 6266113
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ALLOYS
ARGON
BORON
CONTAINERS
DENSITY
ELEMENTS
FABRICATION
FLUIDS
GASES
HOT PRESSING
MATERIALS WORKING
METALS
NONMETALS
PHYSICAL PROPERTIES
POWDERS
PRESSING
RARE GASES
REFRACTORY METALS
SEMIMETALS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
VERY HIGH PRESSURE